1. What is a chemical equation?
Ans: Chemical equation is the symbolic representation of chemical reaction in term of symbols and formula.
2. What is word equation?
Ans: Word equation is the chemical equation which is expressed by writing the name of reactants and products.
3. What is a catalyst?
Ans: The chemical substance that alters the rate of chemical reaction and do not take part in chemical reaction is called catalyst. Eg: MnO2, Glycerin etc.
4. Define promoter with an example.
Ans: The chemical substance that doesn't take part in chemical reaction by itself but increases the effect of catalyst in the reaction is called promoter. Eg. Molybdenum (Mo)
5. What is the rate of chemical reaction?
Ans: The rate of chemical reaction is define as the change in the concentration of any one of the reactants or products per unit time to complete the reaction .
6. Write down the factors that affect the rate of chemical reaction.
Ans: The factors that affect the rate of chemical reaction are:
a. surface area
b. catalyst
c. pressure
d. temperature
7. Define combination reaction. Ans: Combination reaction is the process in which a single compound is formed by the direct combination of two or more reactants during a chemical reaction.
8. Define decomposition reaction.
Ans: Decomposition reaction is the process in which a single compound or substance is decomposed into two or more simple molecules in the form of products during a chemical reaction.
Ans: Decomposition reaction is the process in which a single compound or substance is decomposed into two or more simple molecules in the form of products during a chemical reaction.
9. Define displacement reaction.
Ans: Displacement reaction is a process of chemical reaction in which an atom or group of atoms in the molecule is replaced by another atom or a group of atom.
10. What is exothermic reaction?
Ans: Exothermic reaction is the reaction in which heat energy is released to the surroundings during chemical reaction.
11. What is endothermic reaction?
Ans: Endothermic reaction is the reaction in which heat is absorbed from the surrounding.
12. What is single displacement reaction?
Ans: Single displacement reaction is a chemical reaction in which an atom in a molecule is replaced by another atom forming the end products.
13. Define Acid-base reaction.
Ans: Acid-base reaction is the reaction of an acid with a base in which the characteristic properties of both of them are disappeared or neutralized by forming salt and water.
14. Give one example of single displacement chemical reaction.
Ans:
15. What is double displacement reaction?
16. In what condition do sodium chloride and silver nitrate react?
17. What type of chemical reaction is it when calcium carbonate is heated?
2 marks questions
18. Define a combination reaction with an example.
19. What is a decomposition reaction? Explain with the help of an example.
20. Define a displacement reaction with an example.
21. Define a neutralization reaction with an example.
22. Write down the information conveyed by a chemical equation.
23. Write down any two limitations of chemical equations
24. Why is the reaction between hydrochloric acid and sodium hydroxide called neutralization
reaction?
25. Differentiate between exothermic reaction and endothermic reaction.
26. Write any two differences between positive catalyst and negative catalyst.
27. Describe the reason for increasing the rate of chemical reaction on increasing the concentration of
reactants.
28. Write any two characteristics of catalyst.
29. The rate of a chemical reaction increases on increasing temperature, why?
30. How does concentration of reactant affect the rate of chemical reaction?
31. Write 2 conditions required for chemical reaction.
32. Give two examples of chemical reaction caused by catalyst.
33. Write down the cause of increasing the rate of chemical reaction on increasing the temperature of
reactants.
34. Give chemical reaction of each that are caused by light and heat.
35. Write chemical reaction of each exothermic and endothermic reaction.
36. Give and examples of each exothermic and endothermic reaction.
37. Which one will react faster with sulphuric acid, powder zinc or granulated zinc? Give reason.
38. How does the concentration of sodium thiosulphate affect the rate of chemical reaction between
sodium thiosulphate and hydrochloric acid?
39. What happens when:
i. Hydrogen peroxide is heated in presence of manganese dioxide?
ii. Carbon dioxide is passed through lime water/
iii. Silver nitrate solutions added to aqueous sodium chloride solution?
iv. Copper is reacted with hot and conc. Sulpheric acid?
v. Ammonium chloride is heated with slaked lime?
3 marks questions
40. What happens when magnesium is burnt in air? Write its balanced chemical reaction. What type
of chemical reaction is it?
41. What is catalyst? Explain two types of catalyst with examples.
42. Write any three limitation of balanced chemical equation.
43. What is Avogadro’s number? How much gram of carbon dioxide and lime can be formed form
10 gm calcium carbonate?
44. Write the balance chemical equation to show the chemical reaction between chlorine gas and
potassium iodide. State the type of chemical reaction also.
45. How can you prove that the rate of the chemical reaction increases with the increase in
temperature? Explain with an example.
46. Study the following chemical equations and answer the given question:
i. What are the numbers of molecules of reactants and products?
ii. Calculate what gram of CO2 if evolved, if 200mg of CaCO3 is heated.
47. In which condition do sodium chloride and silver nitrate react? Write balance chemical reaction
between them. Also mention the type of the chemical reaction.
48. Lime is dissolved in HCl to form CuCl2 and H2O.
i. How many moles of HCl will be required to dissolve 8.5 moles of CaO?
ii. How may moles of water will be formed?
4 marks questions
49. Write the different types of chemical reactions. Explain any two of them.
50. What is the rate of chemical reaction? How much gram of lime is formed when 100gm of
limestone is heated in air?
51. Describe any two factors that can influence the chemical change. Define catalyst. What is the
importance of MnO2 in preparation of oxygen from potassium chlorate?
52. What do you understand by mole? Show the relationship between mole and Avogadro’s number.
53. What happens when iron nail is kept into atmosphere for a long time? Explain the changes with
balanced chemical reaction.
54. Describe an experiment with diagram to prove rate of chemical reaction increase with increase in
temperature.
55. What is the relation between rate of chemical reaction and surface area of chemical substance?
Explain an experiment to show the relationship between them.
56. What happens when dilute hydrochloric acid is poured over pieces of lime stone? Write down the
balanced chemical reaction involved and also mention its types.
57. Write down the balanced reaction between a more electropositive and a more electronegative
element and also assign the type of this chemical equation.
Ans: Displacement reaction is a process of chemical reaction in which an atom or group of atoms in the molecule is replaced by another atom or a group of atom.
10. What is exothermic reaction?
Ans: Exothermic reaction is the reaction in which heat energy is released to the surroundings during chemical reaction.
11. What is endothermic reaction?
Ans: Endothermic reaction is the reaction in which heat is absorbed from the surrounding.
12. What is single displacement reaction?
Ans: Single displacement reaction is a chemical reaction in which an atom in a molecule is replaced by another atom forming the end products.
13. Define Acid-base reaction.
Ans: Acid-base reaction is the reaction of an acid with a base in which the characteristic properties of both of them are disappeared or neutralized by forming salt and water.
14. Give one example of single displacement chemical reaction.
Ans:
15. What is double displacement reaction?
16. In what condition do sodium chloride and silver nitrate react?
17. What type of chemical reaction is it when calcium carbonate is heated?
2 marks questions
18. Define a combination reaction with an example.
19. What is a decomposition reaction? Explain with the help of an example.
20. Define a displacement reaction with an example.
21. Define a neutralization reaction with an example.
22. Write down the information conveyed by a chemical equation.
23. Write down any two limitations of chemical equations
24. Why is the reaction between hydrochloric acid and sodium hydroxide called neutralization
reaction?
25. Differentiate between exothermic reaction and endothermic reaction.
26. Write any two differences between positive catalyst and negative catalyst.
27. Describe the reason for increasing the rate of chemical reaction on increasing the concentration of
reactants.
28. Write any two characteristics of catalyst.
29. The rate of a chemical reaction increases on increasing temperature, why?
30. How does concentration of reactant affect the rate of chemical reaction?
31. Write 2 conditions required for chemical reaction.
32. Give two examples of chemical reaction caused by catalyst.
33. Write down the cause of increasing the rate of chemical reaction on increasing the temperature of
reactants.
34. Give chemical reaction of each that are caused by light and heat.
35. Write chemical reaction of each exothermic and endothermic reaction.
36. Give and examples of each exothermic and endothermic reaction.
37. Which one will react faster with sulphuric acid, powder zinc or granulated zinc? Give reason.
38. How does the concentration of sodium thiosulphate affect the rate of chemical reaction between
sodium thiosulphate and hydrochloric acid?
39. What happens when:
i. Hydrogen peroxide is heated in presence of manganese dioxide?
ii. Carbon dioxide is passed through lime water/
iii. Silver nitrate solutions added to aqueous sodium chloride solution?
iv. Copper is reacted with hot and conc. Sulpheric acid?
v. Ammonium chloride is heated with slaked lime?
3 marks questions
40. What happens when magnesium is burnt in air? Write its balanced chemical reaction. What type
of chemical reaction is it?
41. What is catalyst? Explain two types of catalyst with examples.
42. Write any three limitation of balanced chemical equation.
43. What is Avogadro’s number? How much gram of carbon dioxide and lime can be formed form
10 gm calcium carbonate?
44. Write the balance chemical equation to show the chemical reaction between chlorine gas and
potassium iodide. State the type of chemical reaction also.
45. How can you prove that the rate of the chemical reaction increases with the increase in
temperature? Explain with an example.
46. Study the following chemical equations and answer the given question:
i. What are the numbers of molecules of reactants and products?
ii. Calculate what gram of CO2 if evolved, if 200mg of CaCO3 is heated.
47. In which condition do sodium chloride and silver nitrate react? Write balance chemical reaction
between them. Also mention the type of the chemical reaction.
48. Lime is dissolved in HCl to form CuCl2 and H2O.
i. How many moles of HCl will be required to dissolve 8.5 moles of CaO?
ii. How may moles of water will be formed?
4 marks questions
49. Write the different types of chemical reactions. Explain any two of them.
50. What is the rate of chemical reaction? How much gram of lime is formed when 100gm of
limestone is heated in air?
51. Describe any two factors that can influence the chemical change. Define catalyst. What is the
importance of MnO2 in preparation of oxygen from potassium chlorate?
52. What do you understand by mole? Show the relationship between mole and Avogadro’s number.
53. What happens when iron nail is kept into atmosphere for a long time? Explain the changes with
balanced chemical reaction.
54. Describe an experiment with diagram to prove rate of chemical reaction increase with increase in
temperature.
55. What is the relation between rate of chemical reaction and surface area of chemical substance?
Explain an experiment to show the relationship between them.
56. What happens when dilute hydrochloric acid is poured over pieces of lime stone? Write down the
balanced chemical reaction involved and also mention its types.
57. Write down the balanced reaction between a more electropositive and a more electronegative
element and also assign the type of this chemical equation.
Posts
1 marks q no 1
ReplyDeletechemical equation is the symbolic representation of chemical reaction in term of symbols and formula.
1 marks qno 2
ReplyDeleteword equation is the chemical equation which is expressed by writing the name of reactants and products.
1 marks qno3.
ReplyDeletethe chemical substance that alters the rate of chemical reaction is called catalyst.
1 marks qno5.
ReplyDeletethe rate of chemical reaction is define as the change in the concentration of any one of the reactants or products per unit time to complete the reaction .
1marks qno 6.
ReplyDeletethe factors that affect the rate of chemical reaction are
a. surface area
b. catalyst
c. pressure
1 marks qno 7
ReplyDeletecombination reaction is the process in which a single compound is formed by the direct combination of two or more reactants during a chemical reaction .
1 marks q no 8
ReplyDeletedecomposition reaction is the process in which a single compound or substance is decomposed into two or more simple molecules in the form of products during a chemical reaction.
1 marks qno 9.
ReplyDeletedisplacement reaction is a process of chemical reaction in which an atom or group of atoms in the molecule is replaced by another atom or a group of atom .
1 marks q no10.
ReplyDeleteexothermic reaction is the reaction in which heat energy is released to the surroundings.
1 marks q no11.
ReplyDeleteendothermic reaction is the reaction in which heat is absorbed from the surrounding .
1marks qno 12
ReplyDeletesingle displacement reaction is a chemical reaction in which an atom in a molecule is replaced by another atom forming the end products.
1 marks qno 13
ReplyDeleteAcid-base reaction is the reaction of an acid with a base in which the characteristic properties of both of them are destroyed or neutralized.
1 marks q no 14.
ReplyDeleteexample of single displacement chemical reaction is
zinc + sulphuric acid =zin sulphate + hydrogen gas
1 marks qno15.
ReplyDeletedouble displacement reaction is a chemical reaction in which two compounds react together to form two other compounds by mutual exchange of their ions.
1 marks q no16.
ReplyDeletethe condition for sodium chloride and silver nitrate reaction is that the both must be dissolved in water.
1 marks 17.
ReplyDeletethe type of chemical reaction when calcium carbonate is heated is decomposition reaction.
2 marks q no18
ReplyDeletea combination reaction is a process in which a single compound is formed by the direct combination of two or more reactants during a chemical reaction.
example;
2Na+Cl2=2NaCl
2 marks q no19.
ReplyDeletedecomposition reaction is a chemical reaction in which a single compound or substance is decomposed into two or more simple molecules in the form of products during a chemical reaction.it is also called dissociation reaction .this type of reaction occurs due to heat, light, catalyst etc.
example
when lead oxide is heated ,it decomposes into lead and oxide .
2 marks q no20.
ReplyDeletedisplacement reaction is a chemical reaction in which an atom or group of atoms in the molecule is replaced by another atom or a group of atom .it is also called replacement reaction.it is of two types (i)single displacement reaction and (ii) double displacement reaction.
example
Zn + H2SO4 = ZnSO4 + H2
2 marks qno 21
ReplyDeleteNeutralization reaction is the chemical reaction of an acid with a base in which the characteristic properties of both of them are destroyed neutralized.it is also called acid-base reaction.
example
NaOH + HCL =NaCl +H2O
2 marks qno 22.
ReplyDeletethe information conveyed by a chemical equation are
I. it helps to know the formulas and symbols of the reactants and products.
II. it shows the physical state of a substance, whether it is a solid, liquid, gas.
1 marks qno,10 (yash) the reactions in which the heat energy is released to the surrounding are called exothermic reaction
ReplyDelete1 arks q no.11 (yash) the reactions in which heat is absorbed from the surrounding are called exothermic reaction.
ReplyDelete2marks q no23
ReplyDelete. limitations of chemical equations are
I. condition of reaction cannot be explained
II.it cannot give the information about heat absorbed or released .
Q.no.1(1 mark)
ReplyDeleteShubhekshya
The symbolic representation of a chemical change in terms of symbol and molecular formula of reactants and products is called as chemical equation.
Q.no.2(1mark)
ReplyDeleteSubhechha
The equation represented by the name of the chemical substances in words instead of molecular formula is called word equation.
Q.no.3(1 mark)
ReplyDeleteShubhechha
A catalyst is a chemical substance that alters the rate of a chemical reaction without undergoing any changes in itself.
Q.no.4(1 mark)
ReplyDeleteShubhekshya
A promoter is a positive catalyst that accelerates the rate of a chemical reaction.
Eg:MnO2
Q.no.5(1 mark)
ReplyDeleteSubhekshya
The rate of chemical reaction is defined as the change in concentration of any one of the reactants or products per unit time to complete the reaction.
Q.no.6(1 mark)
ReplyDeleteSubhekshya
The factors that affect the rate of chemical reaction are:-
1. Temperature
2. Concentration of reactant
3. Surface area
4. The rate of reaction also depends upon the nature of atom.
Q.no.7(1 mark)
ReplyDeleteSubhechha
The chemical reaction in which two or more than two elements or compounds combine to form a new compound is called combination reaction.
Q.no.8 (1 mark)
ReplyDeleteSubhechha
The chemical reaction in which molecules of a substance decompose into two or more than two elements or compounds is called decomposition reaction.
Q.no.9(1mark)
ReplyDeleteSubhechha
The chemical reaction in which an element or a radical of a compound is displaced by another element is called displacement reaction.
Q.no.10 (1 mark)
ReplyDeleteSubhechha
The reaction in which heat is evolved as a result of the reaction between the reactants to give products is called exothermic reaction.
Q.no.11(1 mark)
ReplyDeleteSubhechha
The chemical reaction in which heat is supplied to the reactants to give product is called endothermic reaction.
Q.no.12 (1 mark)
ReplyDeleteSubhechha
The chemical reaction in which only one element or a radical is displaced is called single displacement reaction.
Q.no.13( 1 mark)
ReplyDeleteSubhechha
The chemical reaction in which an acid reacts with a base to produce salt and water is called acid base reaction.
Q.no.14 (1 mark)
ReplyDeleteSubhechha
One example of single displacement chemical reaction is:-
Zn(s) + H2SO4(aq) = ZnSO4(aq) + H2(g)
Q no.15(1 mark)
ReplyDeleteSubhechha
The chemical reaction in which an element or a radical of one compound is mutually displaced by an element or a radical of another compound is called double displacement reaction.
Q no.16 (1 mark)
ReplyDeleteSubhechha
Silver nitrate and sodium chloride will react in normal condition (aqueous solution) to produce silver chloride, an insoluble solid that precipitates out of the solution, and aqueous sodium nitrate. Silver chloride is a white insoluble solid that will precipitate out of the solution
Q.no. 17 (1 mark)
ReplyDeleteSubhechha
Decomposition chemical reaction is formed when calcium carbonate is heated.
Calcium carbonate (lime water) decomposes into calcium oxide(quick lime) and carbon dioxide when heated.
Q.no.18 (2 mark)
ReplyDeleteSubhechha
The chemical reaction in which two or more than two elements or compounds combine to form a new compound is called combination reaction.
Eg:-
2Na(s) + Cl2(g) = 2NaCl(s)
Q.no.19 ( 2 mark)
ReplyDeleteSubhechha
The chemical reaction in which molecules of a substance decompose into two or more than two elements or compounds is called decomposition reaction.
Eg:-
By electrolysis
2NaCl(s) = 2Na(s) + Cl2 (g)
2H2O(l) = 2H2(g) + O2 (g)
Electrolysis of NaCl occurs at high temperature.
Q.no.20 (1 mark)
ReplyDeleteShubhekshya
The chemical reaction in which an element or a radical of a compound is displaced by another element is called displacement reaction.
EG:-
2KI(s) + Cl2(g) = 2KCl(aq) + I2(g)
Q.no.20 (2 mark)
ReplyDeleteSubhechha
The chemical reaction in which an acid reacts with a base to produce salt and water is called neutralization reaction.
Eg:-
HCl(aq) + NaOH(aq) = NaCl(aq) + H20(I)
Q.no.22 ( 2 mark)
ReplyDeleteSubhechha
The information conveyed by a chemical equation are:-
1. The molecular formula and name of reactants and products.
2. Number of molecules present in reactants and products.
3. The ratio of atomic weight of reactants and products.
4. The type of chemical reaction.
Q.no.23 ( 2 mark)
ReplyDeleteSubhechha
Any two limitations of chemical equation are:-
1. They do not say anything about the state of the reactants and products.
2. They do not say how long time does the reaction take to complete.
Q.no.24( 2 mark)
ReplyDeleteSubhechha
The reaction between hydrochloric acid and sodium hydroxide is called neutralization reaction because it both reacts to produce salt and water and as we know, neutralization reaction is the reaction in which an acid reacts with base to produce salt and water.
HCl + NaOH = NaCl + H2O
Salt Water
Q.no.25 (2 mark)
ReplyDeleteShubhekshya
Difference between exothermic reaction and endothermic reaction are:-
Exothermic reaction
1. Heat is released.
2. Temperature of the surrounding is increased.
3. Favoured by a low temperature surrounding.
4. ∆H is negative.
5. Products have less energy than reactants.
Endothermic reaction
1. Heat is absorbed.
2. Temperature of the surrounding is decreased.
3. Favoured by a high temperature surrounding.
4. ∆H is positive.
5. Products have more energy than reactants.
Q.no.26 ( 2 mark)
ReplyDeleteShubhekshya
Any two difference between positive and negative catalyst are:-
Positive catalyst
1. A catalyst that accelerates the rate of a reaction without being used is called positive catalyst.
2. It decreases the activation energy of reactant molecules.
3. It is also called Promoter.
Negative catalyst
1. A catalyst that decreases the rate of a reaction without being used is called negative catalyst.
2. It increases the activation energy of the reactant molecules.
3. It is also called Inhibitor.
Q.no.27( 2 mark)
ReplyDeleteShubhekshya
The rate of reaction increases with an increase in the concentration of reactants.This means that the rate of reaction is directly proportional to the concentration of the reactants.This occurs because a higher concentration of a reactant will lead to more collisions of that reactant in a specific time period.
This is the reason for increasing the rate of chemical reaction on increasing the concentration of reactant.
Q.no.28 ( 2 mark)
ReplyDeleteShubhekshya
Any two characteristics of a catalyst are:-
1. A catalyst does not initiate a chemical reaction too.
2. A catalyst increase the rate of a chemical reaction, but it cannot make an impossible reaction to happen.
Q.no.29 ( 2 mark)
ReplyDeleteShubhekshya
The rate of a chemical reaction increases on increasing temperature because in general, the increase in the temperature increases the rate of almost all chemical reactions while decrease in temperature decreases the reaction rate. The increase in temperature increases the kinetic energy of the molecules. It causes the breaking of bonds in the reactant molecules and reaction takes place at a high speed. Generally, there is double-fold increase in the reaction rate for each 10°C increase in temperature.
Qno1
ReplyDelete'Sapana
The transformation of a substance from one place to another form permanently is called chemical reaction
Qno2
ReplyDeleteSapana
The eqution represented by the name of the chemical substances in words instead of molecular formula is called word equation
Qno3
ReplyDeleteSapana
The chemical substance that alter the rate of chemical reaction is called catalyst
Qno5
ReplyDeleteSapana
The rate of chemical reaction is define as the change in the concentration of any one of the reactants or products per unit time to compete the reaction
Qno6
ReplyDeleteSapana
The factors that affect the rate of chemical reaction are
1. Surface area
2. Catalyst
3.pressure
Qno7
ReplyDeleteSapana
The chemical reaction in which two or more than two elements or compounds combine to form a new compound is called combination reaction reaction
Qno8
ReplyDeleteSapana
The chemical reaction in which molecules of a substance decompose into two or more than two elements or compounds is called decomposition reaction
Qno9
ReplyDeleteSapana
The chemical reaction in which an element or a radical of a compound is displaced by another element is called displacement reaction
Qno10
ReplyDeleteSapana
Exothermic reaction is the reaction in which heat energy is released to the surroundings
Qno11
ReplyDeleteSapan
Endothermic reaction is the reaction in which heat is absorbed from the surrounding
Qno12
ReplyDeleteSapana
The chemical reaction in which only one element or a radical is displaced is called single displacement reaction
This comment has been removed by the author.
ReplyDeleteQno13
ReplyDeleteSapana
Acid base reaction is the reaction of an acid with a base in which the characteristic properties of them are destroyed or neutralized
Qno14
ReplyDeleteSapana
Example of the single displacement chemical reaction is
Zinc+sulphuric acid=zin sulphate+hydrogen gas
Double displacement reaction is a chemical reaction in which two compounds reaction together to form two other compounds by mutual exchange of their ions
ReplyDeleteQno16
ReplyDeleteSapana
The condition for sodium chloride and silver nitrate reaction is that the both must be dissolved in water
Qno17
ReplyDeleteSapana
The type of chemical reaction when calcium carbonate is heated is decomposition reaction
1 marks question
ReplyDeleteQ NO 1
A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and formula.
Q NO 2
ReplyDeleteA word equation is a chemical reaction expressed in words rather than chemical formula.
Q NO 3
ReplyDeleteA catalyst is a substance which affects the rate of chemical reaction .
Q no 4
ReplyDeletePromoter is any component added to a catalyst to increase activity or selectivity. Examples : tin added to platinum reforming catalysts to improve selectivity to coke formation.
Q NO 5
ReplyDeleteThe rate of chemical reaction is defined as the change in concentration of any one of the reactants or products per unit time to complete the reaction .
Q NO 6
ReplyDeleteThe factors that affect the rate of chemical reaction are
1. Temperature
2. surface area
3. concentration of reactant
Q NO 7
ReplyDeleteThe chemical reaction in which two or more than two elements or compounds combine to form a new compound is called combination reaction.
Q NO 8
ReplyDeleteThe chemical reaction in which molecules of a substance decompose into two or more than two elements or compounds is called decomposition reaction.
Q no 9
ReplyDeleteThe chemical reaction in which an element or a radical of a compound is displaced by another element is called displacement reaction.
Q NO 10
ReplyDeleteThw reaction in which the heat energy is released to the surrounding are called exothermic reaction.
Q NO 11
ReplyDeleteThe reaction in which heat is absorbed from the surrounding are called endothermic reaction.
Q no 12
ReplyDeleteA single-displacement reaction is a chemical reaction in which one element is replaced by another in a compound.
Q NO 13
ReplyDeleteThe chemical reaction in which an acid reacts with a base to produce salt and water is called acid base reaction.
Q NO 14
ReplyDeleteZn+H2SO4 _>> ZnSO4+H2
Q NO 15
ReplyDeleteThe chemical reaction in which an element of one compound is mutually displaced by an element of anther compound is called double-dispacement reaction.
Q No.1(1 marks)
ReplyDeleteChemical equation is the symbolic representation of a chemical reaction in terms of symbols and formulae.
Q.no.1(1 marks)
ReplyDeleteChemical equation is the symbolic representation of a chemical reaction in terms of symbols and formula
Q No.2(1 mark)
ReplyDeleteThe equation represented by the name of the chemical substances in words instead of molecular formula is called word equation.
Q.no.2 (1 marks)
ReplyDeleteThe equation represented by the name of the chemical substance in words instead of molecular formula is called word equation
A catalyst is a substance which affects the rate of chemical reaction
ReplyDeleteQ No. 3(1 mark)
ReplyDeleteA catalyst is a substance which affects the rate of chemical reaction.
Q No.5(1 mark)
ReplyDeleteThe rate of chemical reaction is defined as the change in concentration of any one of the reactants or products per unit time to complete the reaction.
Q.no.5(1 marks)
ReplyDeleteThe rate of chemical reaction is defined as the change in concentration of any one of the reactant or product per unit time to complete the reaction
Q No. 6(1 mark)
ReplyDeleteFactors that affect the rate of chemical reaction are Temperature, concentration of reactant,surface area,nature of atom,etc.
Q.no.6(1 marks)
ReplyDeleteFactors that affect rate of chemical reaction are:
1.temperature
2.concentration of reactant
3.surface area
4.the rate of reaction also depends upon the nature of atom
Q No.7(1 mark)
ReplyDeleteThe chemical reaction in which two or more than two elements or compounds combine to form a new compound is called combination reaction.
Q no 17
ReplyDeleteWhen calcium carbonate is heated thermal decomposition reaction takes place .
Q No.8(1 mark)
ReplyDeleteThe chemical reaction in which molecules of a substance decompose into two or more than two elements or compounds is called decomposition reaction.
Q.no.7(1 marks)
ReplyDeleteThe chemical reaction in which two or more than two elements or compounds combine to form a new compound is called combination reaction
Q No. 9(1 mark)
ReplyDeleteThe chemical reaction in which an element or a radical of a compound is displaced by another element is called displacement reaction.
Q.no.8 (1 marks)
ReplyDeleteThe chemical reaction in which molecules of a substance decompose into two or more than two elements or compounds is called decomposition reaction
Q No.9(1 mark)
ReplyDeleteThe reaction in which the heat energy is released to the surrounding is called exothermic reactions.
Q.no.9 (1 marks)
ReplyDeleteThe reaction in which the heat energy is released to the surrounding are called exothermic reaction
2 marks question
ReplyDeleteQ NO 18
The chemical reaction in which two or more than two elements or compounds combine to form a new compound is called combinaion reaction.
example:2Na +cl2 -->> 2NaCl.
Q No.11(1 mark)
ReplyDeleteThe reaction in which heat is absorbed from the surrounding is called endothermic reaction.
Aastha
ReplyDeleteQ.no.11 (1 mark)
The reaction in which heat is absorbed from the surrounding are called endothermic reaction
Q NO 19
ReplyDeleteThe chemical reaction in which molecules of a substance decompose into two or more than two elements is called decomposition reaction.
example : by heat ;
2PbO2 -->> 2PbO+O2
Qno18
ReplyDeleteSapana
A combination reaction is a process in which a single compound is formed by the direct combination of two or more reactants during a chemical reaction
Q No.12(1 mark)
ReplyDeleteThe chemical reaction in which only one element or a radical of a compound is displaced by another element is called single displacement reaction.
Aastha
ReplyDeleteQ.no.12(1 mark)
The chemical reaction in which only one element or a radical of a compound is displaced by another element is called single displacement reaction
Q NO 20
ReplyDeleteThe chemical reaction in which an element or a radical of a compound is displaced by another element is called displacement reaction.
example: Zn +H2SO4 -->> Zn SO4 + H2
Q No.13(1 mark)
ReplyDeleteThe chemical reaction in which an acid reacts with a base to produce salt and water is called acid base reaction.
Q.no.13(1 mark)
ReplyDeleteThe chemical reaction in which an acid reacts with a base to produce salt and water is called acid base reaction
Q No.14(1 mark)
ReplyDeleteEg. of single displacement chemical reaction:
Zn(s)+H2SO4(aq)=ZnSO4(aq)+H2(g)
Q No.15(1 mark)
ReplyDeleteThe chemical reaction in which an element or a radical of one compound is mutually displaced by an element or a radical of another compound is called double displacement reaction.
Q No.16(1 mark)
ReplyDeleteSodium chloride and silver nitrate reacts when they both are dissolved.
Q No.17(1 mark)
ReplyDeleteWhen calcium carbonate is heated,it's decomposition reaction.
Q No.18
ReplyDeleteThe chemical reaction in which two or more than two elements or compounds combine to form a new compound is called combination reaction.Eg.
2Na(s)+Cl2(g)=2NaCl(s)
Q No.19
ReplyDeleteThe chemical reaction in which molecules of a substance decompose into two or more than two elements or compounds is called decomposition reaction.This type of reaction occurs due to heat,light,etc.
For eg.:
By heat
2PbO2(s)___heat=2PbO(s)+O2(g)
By light
2NaCl(s)➡️2Na(s)+Cl2(g)
Q No.20
ReplyDeleteThe chemical reaction in which an element or a radical of a compound is displaced by another element is called displacement reaction.
Eg.
Zn(s)+H2SO4 (aq)➡️ ZnSO4(aq)+H2(g)
HgCl2(aq)+2KI(aq)➡️2KCl(aq)+HgI2(s)
The chemical reaction in which an acid reacts with a base to produce salt and water is called neutralization reaction.
ReplyDeleteEg.
HCl(aq)+NaOH(aq)➡️NaCl(aq)+H2O (l)
Q no 21
ReplyDeleteA neutralization reaction is when an acid and a base react to form water and salt and involves the combination of hydrogen ions and hydroxyl ions to generate water. Example: When Sodium hydroxide is added to hydrochloric acid.
it forms sodium chloride and water .
Deletei.e. NaOH + HCl-->> NaCl + H20
Q NO 22
ReplyDeleteThe information conveyed by the chemical equation are:
1. Names of various reactants and products.
2. Formula of reactants and products.
Q NO 23
ReplyDeleteAny two limitations of chemical equation are:
(i) A chemical equation does not tell us the physical state of the
reactants and the products in the reaction.
(ii) It does not tell us the actual concentration or dilution of the
reactants used in the reaction.
Q NO 24
ReplyDeleteWhen an acid and a base react with each other then the reaction is called neutralization reaction. The reaction between hydrochloric acid and sodium hydroxide is called neutralization reaction because when they are reacts with each then it forms water and sodium chloride(salt) which is neutral products.
Q NO 25
ReplyDeleteExothermic reaction: 1. The heat energy is released to the surrounding .
2. Products are more stable than reactants.
Endothermic reaction: 1. The heat energy is absorbed from the surrounding.
2. products are less stable than reactants.
Q NO 26
ReplyDeleteAny two differences between positive and negative catalyst are:
Positive catalyst: 1. It increases the rate of a reaction.
2. example: MnO2 is a positive catalyst.
Negative catalyst: 1. It decreases the rate of a reaction.
2. example: Glycerine is a negative catalyst.
Q no 27
ReplyDeleteIn increasing the concentration of reactants rate of chemical reaction also increases because a higher concentration of a reactant will lead to more collisions of that reactant in a specific time period.
Q NO 28
ReplyDeleteAny two characteristics of catalyst are:
(1) A catalyst remains unchanged in mass and chemical composition at the end of the reaction.
(2) A small quantity of the catalyst is generally sufficient to catalyses almost unlimited reactions.
Q NO 29
ReplyDeleteThe rate of a chemical reaction increases on increasing temperature because increase in temperature increases the kinetic energy of the molecules which causes the breaking of bonds in the reactant molecules and reaction takes place at a high speed . So the rate of chemical reaction increases on increasing temperature.
Q.no.14(1 mark)
ReplyDeleteEg.of single displacement reaction is:
Zn(s)+CuSO4(aq)➡ZnSO4(aq)+Cu(s)
Q.no.15
ReplyDeleteThe chemical reaction in which an element or a radical of one compound is mutually displaced by an element or a radical of another compound is called double displacement reaction
Q.no.16
ReplyDeleteSodium chloride and silver nitrate reacts if they both are dissolved
Q.no.17
ReplyDeleteWhen calcium carbonate is heated it is decomposition reaction
Q.no.18
ReplyDeleteThe chemical reaction in which two or more than two elements or compounds combine to form a new compound is called combination reaction.This reaction is also called as addition reaction.
Eg.
2Na(s)+Cl2(g)➡2NaCl(s)
Q.no.19
ReplyDeleteThe chemical reaction in which molecules of a substance decompose into two or more than two elements or compounds is called decomposition reaction.This reaction is also called dissociation reaction.This type of reaction occurs due to heat,light,electricity,catalyst etc.
Eg.
By heat
2PbO2(s)___heat=2PbO(s)+O2(g)
By electrolysis
2NaCl(s)➡2Na(s)+Cl2(g)
Q.no.20
ReplyDeleteThe chemical reaction in which an element or a radical of a compound is displaced by another element is called displacement reaction
Example.
Zn(s)+H2SO4(aq)➡ZnSO4(aq)+H2(g)
HgCl2(aq)+2KI(aq)➡2KCl(aq)+HgI2(s)
Qno20
ReplyDeleteSapana
The chemical reaction in which an element or a radical of a compound is displacement by another element is called displacement reaction.
Example
Zn+H2SO4--ZnSo+H2
Qno26
ReplyDeleteSapana
Any two difference between positive and negative catalyst are
1.it decreases the activation energy of reactant molecules
2it is also called promoter
Negative catalyst
1.it increases the activation energy of the reaction molecules
2.it is also called inhibitor
Qno28
ReplyDeleteSapana
Any two characteristics of a catalyst are
1.a catalyst does not initiate a chemical reaction to
2.a catalyst increases the rate of a chemical reaction but it cannot make an impossible reaction to happen
Qno27
ReplyDeleteSapana
In increasing the concentration of reactions of chemical reaction also increases because a higher concentration of a reaction will lead to more collisions of that reactant in a specific time period
Qno 18
ReplyDeleteSapana
The chemical reaction in which two or more than two elements or compounds combined to form a new compound is called combination reaction
Example
2Na(s)+Cl2(g)=2Nacl(s)
Qno.6
ReplyDeleteAns: The factors that affect the rate of chemical reaction are:
a. surface area
b. catalyst
c. pressure
d. temperature
Qno.17
ReplyDeleteAns:
Thermal decomposition is the type of chemical reaction in which calcium carbonate is heated
This comment has been removed by the author.
ReplyDeleteQno.19
ReplyDeleteAns: A neutralization reaction is when an acid and a base react to form water and salt .Example: When Sodium hydroxide is added to hydrochloric acid.
Q NO 31
ReplyDeleteAny two conditions required for chemical reaction are:
1.The reaction in which heat energy is released during the chemical reaction is said to be an exothermic reaction.
2.The catalyst that increases the rate of chemical reaction is positive catalyst.