Free Printable Chemical Reactions and Equations

1.

During a lab experiment, a scientist numbers three beakers. Next, she pours 150 mL of liquid into each beaker. Each liquid is different.Then, the scientist adds 5 g of white solid baking soda (NaHCO₃) to each beaker and stirs. She observes the results.
In which of the beakers does the scientist observe clear evidence of a chemical reaction?

a)

beaker 1 only

b)

beaker 2 only

c)

beaker 3 only

d)

beakers 1,2, and 3

2.

Which of the following is a chemical reaction?

a)

Water freezes.

b)

Sugar dissolves in water.

c)

Salt and pepper are mixed in a dish.

d)

Iron rusts.

3.

When two substances were combined, bubbles were produced and the temperature dropped. This most likely means that:

a)

a chemical reaction took place

b)

the two substances had low boiling points

c)

one substance dissolved in the other

d)

the two substances are non-reactive

4.

Before a chemical reaction, the total mass of two reactants is measured to be 40 grams. After the reaction, what should be the total mass of the products?

a)

0 grams

b)

20 grams

c)

40 grams

d)

80 grams

5.

Copper chloride and aluminum react to produce aluminum chloride and copper. Which of the following is the correctly balanced chemical equation for this reaction?

a)

CuCl₂ + Al -> AlCl₃ + Cu

b)

3CuCl₂ + Al -> AlCl₃ + 2Cu

c)

3CuCl₂ + 2Al -> 2AlCl₃ + 3Cu

d)

CuCl₂ + 3Al -> AlCl₃ + 2Cu

6.

Which observation would most likely indicate that an exothermic reaction has occurred?

a)

a color change

b)

the production of gas bubbles

c)

an increase in temperature

d)

a decrease in temperature

7.

The first part of a balanced chemical equation is shown: H₂SO₄ + 2NaOH → ________. In order for this equation to be balanced, how many hydrogen (H) atoms must be present in the products?

a)

2

b)

3

c)

4

d)

5

8.

Suppose two substances were combined together in a beaker. You know that a chemical reaction occurred if:

a)

new substances were created.

b)

one substance dissolved in the other.

c)

one substance melted in the other.

d)

the two substances remained separate.

9.

All of the following are indicators of a chemical reaction except one. Which one is NOT an indicator that a chemical reaction has taken place?

a)

he production of heat or light

b)

a color change

c)

the production of gas bubbles

d)

the dissolving of one substance in another

10.

The idea that matter is neither created nor destroyed in chemical reactions is known as the:

a)

The idea that matter is neither created nor destroyed in chemical reactions is known as the:

b)

law of conservation of energy.

c)

law of conservation of mass.

d)

second law of thermodynamics.

11.

A teacher writes the equation representing the chemical reaction between hydrochloric acid and sodium on the board.HCl + Na → NaCl + H₂The teacher states that the equation has not been balanced. Which of these correctly shows the products of this reaction after the equation has been balanced?

a)

Na₂Cl + H₂

b)

2NaCl + H₂

c)

NaCl + 2H₂

d)

2NaCl + 2H₂

12.

The law of conservation of matter states that:

a)

matter is neither created nor destroyed.

b)

the mass of the products is always greater than the mass of the reactants.

c)

the mass of the products is always less than the mass of the reactants.

d)

matter is always converted into an equal amount of energy.

13.

Chemical formula of quick lime is :

a)

CaO

b)

Ca(OH)2

c)

CaCO3

d)

CO2

14.

Silver article turns black when kept in open for a few days due to formation of

a)

H2S

b)

AgS

c)

AgSO4

d)

Ag2S

15.

A chemical equation should be balanced to :

a)

show conservation of energy

b)

show conservation of mass

c)

to make equation attractive

d)

All of the above

16.

In which of the following process a chemical reaction has taken place?

a)

Ice melts into water

b)

A wet shirt got dried in sunlight

c)

A brown layer is formed over iron rod kept in air

d)

sugar getting dissolved in water

17.

Which of the following is not a chemical reaction ?

a)

Formation of salt solution

b)

Milk turns sour in hot weather

c)

Burning of match stick

d)

Contamination of food

18.

An unbalanced chemical equation is written in :

a)

Simple form

b)

Proper form

c)

Unorganized form

d)

Skeletal form

19.

The reaction in which two compound exchange their ions to form two new compounds is called

a)

displacement reaction

b)

combination reaction

c)

redox reaction

d)

double displacement reaction

20.

Which of the following gases can be used for storage of fresh sampel of an oil for a long time?

a)

Carbon dioxide or oxygen

b)

Nitrogen or helium

c)

Helium or oxygen

d)

Nitrogen or oxygen

21.

The chemical formula of lead sulphate is :

a)

Pb2SO4

b)

Pb(SO4)2

c)

PbSO4

d)

Pb2(SO4)3

22.

Which of the following reactions involves the combination of two elements :-

a)

CaO + CO₂ -> CaCO₃

b)

4Na + O₂ -> 2Na₂O

c)

SO₂ +(1/2)O₂ -> SO₃

d)

NH₃ + HCI -> NH₄CI

23.

3.What happens when copper rod is dipped in iron sulphate solution :-

a)

Copper displaces iron

b)

Blue color of copper sulphate solution is obtained

c)

No reaction takes place

d)

Reaction is exothermic

24.

7.The equation

Cu + xHNO₃ -> Cu(NO₃)₂ + yNO₂ + 2H₂O

The values of x and y are

a)

3 and 5

b)

8 and 6

c)

4 and 2

d)

7 and 1

25.

In the following equation:

Na₂CO₃ + xHCI -> 2NaCI +CO₂ + H₂O, the value of x is

a)

1

b)

2

c)

3

d)

4

26.

White silver chloride in sunlight turns to :

a)

Grey

b)

Yellow

c)

Remain white

d)

Red

27.

Which of the following does not corrode when exposed to the atmosphere-

a)

Fe

b)

Cu

c)

Au

d)

Ag

28.

Black and white photography uses

a)

Decomposition of silver chloride

b)

Decomposition of silver bromide

c)

Both

d)

None of these

29.

Rusting of an iron is an example of :

a)

Reduction

b)

Ionization

c)

Oxidation

d)

Dissociation

30.

A redox reaction is one in which :

a)

Both the substance are reduced

b)

Both the substance are oxidized

c)

An acid is neutralized by the base

d)

One substance is oxidized while the other is reduced

31.

Which of the following product is formed when calcium oxide reacts with water?

a)

Slaked lime

b)

Carbon dioxide

c)

Calcium oxide

d)

Oxygen gas

32.

Heating of ferrous sulphate gives which of the following product?

a)

Ferric oxide

b)

Sulphur dioxide

c)

Sulphur trioxide

d)

All the above

33.

The first part of a balanced chemical equation is shown: H₂SO₄ + 2NaOH → ________. In order for this equation to be balanced, how many hydrogen (H) atoms must be present in the products?

a)

2

b)

3

c)

4

d)

5

34.

A teacher writes the equation representing the chemical reaction between hydrochloric acid and sodium on the board.HCl + Na → NaCl + H₂The teacher states that the equation has not been balanced. Which of these correctly shows the products of this reaction after the equation has been balanced?

a)

Na₂Cl + H₂

b)

2NaCl + H₂

c)

NaCl + 2H₂

d)

2NaCl + 2H₂

35.

The following reaction is an example of a 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)(i) displacement reaction (ii) combination reaction (iii) redox reaction (iv) neutralisation reaction

a)

(i) and (iv)

b)

(ii) and (iii)

c)

(i) and (iii)

d)

(iii) and (iv)

36.

Which of the following statements about the given reaction are correct?3Fe(s) + 4H2O(g) → Fe3O4(s) + 4H2(g)(i) Iron metal is getting oxidised (ii) Water is getting reduced (iii) Water is acting as reducing agent (iv) Water is acting as oxidising agent

a)

(i), (ii) and (iii)

b)

(iii) and (iv)

c)

(i), (ii) and (iv)

d)

(ii) and (iv)

37.

Which among the following is(are) double displacement reaction(s)?(i) Pb + CuCl2 → PbCl2 + Cu (ii) Na2SO4 + BaCl2 → BaSO4 + 2NaCl (iii) C + O2 → CO2 (iv) CH4 + 2O2 → CO2 + 2H2O

a)

(i) and (iv)

b)

(ii) only

c)

(i) and (ii)

d)

(iii) and (iv)

38.

Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is

a)

(a) 1:1

b)

(b) 2:1

c)

(c) 4:1

d)

(d) 1:2

39.

Which of the following are combination reactions?(i) 2KClO3⎯Heat⎯→ 2KCl + 3O2 (ii) MgO + H2O ⎯→ Mg(OH)2 (iii) 4Al + 3O2 ⎯→ 2Al2 O3 (iv) Zn + FeSO4 → ZnSO4 + Fe

a)

(a) (i) and (iii)

b)

(b) (iii) and (iv)

c)

(c) (ii) and (iv)

d)

(d) (ii) and (iii)

40.

Which of the following reactions is balanced?

a)

2CH₄ + O₂ -> CO₂ + H₂O

b)

CH₄ + 2O₂ -> CO₂ + H₂O

c)

CH₄ + 2O₂ -> CO₂ + 2H₂O

d)

None of the chemical equations are balanced.

41.

Chemical formula of lime water is :

a)

CaO

b)

Ca(OH)₂

c)

CaCO₃

d)

CO₂

42.

Silver article turns black when kept in open for a few days due to formation of

a)

H2S

b)

AgS

c)

AgSO4

d)

Ag2S

43.

The reaction in which two compound exchange their ions to form two new compounds is called

a)

displacement reaction

b)

combination reaction

c)

redox reaction

d)

double displacement reaction

44.

The chemical formula of lead sulphate is :

a)

Pb2SO4

b)

Pb(SO4)2

c)

PbSO4

d)

Pb2(SO4)3

45.

7.The equation

Cu + xHNO₃ -> Cu(NO₃)₂ + yNO₂ + 2H₂O

The values of x and y are

a)

3 and 5

b)

8 and 6

c)

4 and 2

d)

7 and 1

46.

White silver chloride in sunlight turns to :

a)

Grey

b)

Yellow

c)

Remain white

d)

Red

47.

Heating of ferrous sulphate gives which of the following product?

a)

Ferric oxide

b)

Sulphur dioxide

c)

Sulphur trioxide

d)

All the above

48.

These are all models of the same molecule. What would this molecule look like in a chemical/molecular formula?

a)

CH

b)

C4H

c)

CH₄

d)

4CH

49.

How many Hydrogen are in 4H₂O?

a)

6

b)

8

c)

2

d)

4

50.

Is the following equation balanced?...
Al + O₂ --> 2Al₂O₃

a)

Yes!

b)

No!

51.

Which of the following chemical equations follows the Law of Conservation of Mass? Hint: which is balanced?

a)

CO₂ + H₂O --> C₆H₁₂O₆ + O₂

b)

C₆O + H₁₂O --> C₆H₁₂O₂

c)

CO₂ + H₂O --> C₆H₁₂O₆ + O₂

d)

CO₂ +H₂O --> C₆H₁₂O₆ +O₂

52.

For an investigation a student poured a blue solution of CuSO₄ into a beaker. The student placed a shiny, silver-colored strip of zinc metal in the solution and wrote down the changes. Which change shows that a CHEMICAL REACTION took place?

a)

A dark solid (precipitate) formed on the zinc metal.

b)

The zinc metal stayed silver-colored and shiny

c)

The CuSO₄solution evaporated after the zinc metal was added.

d)

None of these

53.

The first part of a balanced chemical equation is shown: H₂SO₄ + 2NaOH → ________. In order for this equation to be balanced, how many hydrogen (H) atoms must be present in the products?

a)

2

b)

3

c)

4

d)

5

54.

A teacher writes the equation representing the chemical reaction between hydrochloric acid and sodium on the board.HCl + Na → NaCl + H₂The teacher states that the equation has not been balanced. Which of these correctly shows the products of this reaction after the equation has been balanced?

a)

Na₂Cl + H₂

b)

2NaCl + H₂

c)

NaCl + 2H₂

d)

2NaCl + 2H₂

55.

The following reaction is an example of a 4NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g)(i) displacement reaction (ii) combination reaction (iii) redox reaction (iv) neutralisation reaction

a)

(i) and (iv)

b)

(ii) and (iii)

c)

(i) and (iii)

d)

(iii) and (iv)

56.

Which of the following statements about the given reaction are correct?3Fe(s) + 4H2O(g) → Fe3O4(s) + 4H2(g)(i) Iron metal is getting oxidised (ii) Water is getting reduced (iii) Water is acting as reducing agent (iv) Water is acting as oxidising agent

a)

(i), (ii) and (iii)

b)

(iii) and (iv)

c)

(i), (ii) and (iv)

d)

(ii) and (iv)

57.

Which among the following is(are) double displacement reaction(s)?(i) Pb + CuCl2 → PbCl2 + Cu (ii) Na2SO4 + BaCl2 → BaSO4 + 2NaCl (iii) C + O2 → CO2 (iv) CH4 + 2O2 → CO2 + 2H2O

a)

(i) and (iv)

b)

(ii) only

c)

(i) and (ii)

d)

(iii) and (iv)

58.

Electrolysis of water is a decomposition reaction. The mole ratio of hydrogen and oxygen gases liberated during electrolysis of water is

a)

(a) 1:1

b)

(b) 2:1

c)

(c) 4:1

d)

(d) 1:2

59.

Which of the following are combination reactions?(i) 2KClO3⎯Heat⎯→ 2KCl + 3O2 (ii) MgO + H2O ⎯→ Mg(OH)2 (iii) 4Al + 3O2 ⎯→ 2Al2 O3 (iv) Zn + FeSO4 → ZnSO4 + Fe

a)

(a) (i) and (iii)

b)

(b) (iii) and (iv)

c)

(c) (ii) and (iv)

d)

(d) (ii) and (iii)

60.

Which of the following reactions is balanced?

a)

2CH₄ + O₂ -> CO₂ + H₂O

b)

CH₄ + 2O₂ -> CO₂ + H₂O

c)

CH₄ + 2O₂ -> CO₂ + 2H₂O

d)

None of the chemical equations are balanced.

61.

Which of the following reactions is balanced?

a)

2CH₄ + O₂ -> CO₂ + H₂O

b)

CH₄ + 2O₂ -> CO₂ + H₂O

c)

CH₄ + 2O₂ -> CO₂ + 2H₂O

d)

None of the chemical equations are balanced.

62.

Silver article turns black when kept in open for a few days due to formation of

a)

H2S

b)

AgS

c)

AgSO4

d)

Ag2S

63.

The reaction in which two compound exchange their ions to form two new compounds is called

a)

displacement reaction

b)

combination reaction

c)

redox reaction

d)

double displacement reaction

64.

The chemical formula of lead sulphate is :

a)

Pb2SO4

b)

Pb(SO4)2

c)

PbSO4

d)

Pb2(SO4)3

65.

7.The equation

Cu + xHNO₃ -> Cu(NO₃)₂ + yNO₂ + 2H₂O

The values of x and y are

a)

3 and 5

b)

8 and 6

c)

4 and 2

d)

7 and 1

66.

White silver chloride in sunlight turns to :

a)

Grey

b)

Yellow

c)

Remain white

d)

Red

67.

Heating of ferrous sulphate gives which of the following product?

a)

Ferric oxide

b)

Sulphur dioxide

c)

Sulphur trioxide

d)

All the above

68.

These are all models of the same molecule. What would this molecule look like in a chemical/molecular formula?

a)

CH

b)

C4H

c)

CH₄

d)

4CH

69.

How many Hydrogen are in 4H₂O?

a)

6

b)

8

c)

2

d)

4

70.

Is the following equation balanced?...
Al + O₂ --> 2Al₂O₃

a)

Yes!

b)

No!

71.

Which of the following chemical equations follows the Law of Conservation of Mass? Hint: which is balanced?

a)

CO₂ + H₂O --> C₆H₁₂O₆ + O₂

b)

C₆O + H₁₂O --> C₆H₁₂O₂

c)

CO₂ + H₂O --> C₆H₁₂O₆ + O₂

d)

CO₂ +H₂O --> C₆H₁₂O₆ +O₂

72.

For an investigation a student poured a blue solution of CuSO₄ into a beaker. The student placed a shiny, silver-colored strip of zinc metal in the solution and wrote down the changes. Which change shows that a CHEMICAL REACTION took place?

a)

A dark solid (precipitate) formed on the zinc metal.

b)

The zinc metal stayed silver-colored and shiny

c)

The CuSO₄solution evaporated after the zinc metal was added.

d)

None of these

Chemical Reactions and Equations

Total questions: 72

Worksheet time: 1hrs 2mins

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