Free Printable Chemical Reactions Practice

1.

Balance this reaction: ____ Na₃PO₄ + ____ KOH ---> ____ NaOH + ____ K₃PO₄

a)

1,3,3,1

b)

1,3,2,1

c)

2,3,3,1

d)

1,1,3,1

2.

Balancing this reaction: ____ CH₄ + ____ O₂ ---> ____ CO₂ + ____ H₂O

a)

2,1,3,1

b)

1,2,1,2

c)

1,2,2,1

d)

2,1,1,2

3.

Balance this reaction: ____ NaF + ____ Br₂ ---> ____ NaBr + ____ F₂

a)

3,1,2,1

b)

1,2,3,4

c)

2,1,2,1

d)

1,2,1,2

4.

Which of these is NOT a sign of a chemical reaction?

a)

A gas is given off

b)

The material dissolves

c)

Heat is released

d)

A color change occurs

5.

In a balanced chemical equation, the mass of the reactant is equal to the

a)

atoms in a molecule.

b)

atomic mass of the elements.

c)

volume of the reactacts.

d)

mass of the products.

6.

What happens in a chemical reaction?

a)

Atoms are destroyed.

b)

Atoms are created.

c)

Atoms are rearranged.

d)

Atoms gain/lose atomic mass.

7.

Which of the following is NOT a "Tell-Tell" evidence of a possible chemical reaction?

a)

formation of a gas

b)

state of matter change

c)

formation of a solid

d)

color change

e)

temperature change

8.

A balanced chemical reaction obeys the Law of

a)

Ideal Gases.

b)

Definite Proportions.

c)

Conservation of Matter.

d)

Conservation of Energy.

e)

Demand

9.

What coefficient is missing in the following balanced chemical equation: 2Ni₂O₃ >>> 4Ni + __O₂

a)

2

b)

3

c)

4

d)

5

10.

Give the ratio for the following equation:

Zn + 2HCl >>> ZnCl₂ + H₂

a)

1:1:1

b)

1:2:1

c)

1:2:1:1

d)

1:2:2:2

11.

Which of the following equations is NOT balanced?

a)

Fe + S >>> FeS

b)

KOH + HCl >>> KCl + H₂O

c)

2Mg + O₂ >>> 2MgO

d)

NaCl + H₂SO₄ >>> Na₂SO₄ + HCl

12.

A chemical equation is balanced by changing or adding

a)

chemical symbols.

b)

subscripts.

c)

coefficients.

d)

reactants.

13.

What is the balanced equation for the combustion of sulfur?

a)

S + O₂ >>> SO

b)

S + O₂ >>> SO₂

c)

2S + 3O₂ >>> SO₃

d)

S + 2O₂ >>> SO₂^4–

14.

What type of chemical reaction is the following:

2Mg + O₂ >>> 2MgO

a)

synthesis reaction.

b)

decomposition reaction.

c)

single-replacement reaction.

d)

double-replacement reaction.

15.

What type of chemical reaction is the following:

Mg + 2HCl >>> H₂ + MgCl₂

a)

synthesis

b)

decomposition

c)

single-replacement

d)

double-replacement

16.

What type of chemical reaction is the following:

2HgO >>> 2Hg + O₂

a)

synthesis

b)

decomposition

c)

single-replacement

d)

double-replacement

17.

What type of chemical reaction is the following:

Pb(NO₃)₂ + 2KI >>> PbI₂ + 2KNO₃

a)

synthesis

b)

decomposition

c)

single-replacement

d)

double-replacement

18.

When one element replaces another element in a compound during a chemical reaction, the reaction is a _____ reaction.

a)

synthesis

b)

decomposition

c)

single-replacement

d)

double-replacement

19.

A chemical equation is balanced when the

a)

coefficients of the reactants equal the coefficients of the products.

b)

same number of each kind of atom appears in the reactants and in the products.

c)

products and reactants are the same chemicals.

d)

subscripts of the reactants equal the subscripts of the products.

20.

This unbalanced equation represents a chemical reaction:

Pb(NO₃)₂+ NaI → NaNO₃ + PbI₂

What is the coefficient for NaI once the equation is balanced?

a)

1

b)

2

c)

3

d)

4

21.

What types of reactions absorb and release heat?

a)

acidic and basic

b)

endothermic and exothermic

c)

endothermic and heat transfusion

d)

covalent and ionic

22.

A scientist combines chemicals and produces an exothermic reaction. What byproduct of this reaction would show that it is exothermic?

a)

heat

b)

coolness

c)

a precipitate

d)

gas bubbles

23.

A chemical reaction that absorbs heat

a)

Single replacement

b)

Exothermic

c)

Endothermic

d)

Decomposition

24.

What reaction has the following general formula:

AB --> A + B

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

25.

What reaction has the following general formula:

A + CD --> C + AD

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

26.

What reaction has the following general formula:

AB + CD --> CB + AD

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

27.

What reaction has the following general formula:

A + B --> AB

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

28.

What reaction has the following general formula:
$C_xH_y\ +\ O_2\ ->CO_{2\ }+\ H_2O$

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

29.

What is the general reaction scheme for a single replacement reaction?

a)

A + B --> AB

b)

AB --> A + B

c)

A + CD --> C + AD

d)

AB + CD --> CB + AD

e)

$C_xH_y+O_2\ ->\ CO_2+H_2O$

30.

What is the general reaction scheme for a combustion reaction?

a)

A + B --> AB

b)

AB --> A + B

c)

A + CD --> C + AD

d)

AB + CD --> CB + AD

e)

$C_xH_y+O_2\ ->\ CO_2+H_2O$

31.

What is the general reaction scheme for a double replacement reaction?

a)

A + B --> AB

b)

AB --> A + B

c)

A + CD --> C + AD

d)

AB + CD --> CB + AD

e)

$C_xH_y+O_2\ ->\ CO_2+H_2O$

32.

What is the general reaction scheme for a decomposition reaction?

a)

A + B --> AB

b)

AB --> A + B

c)

A + CD --> C + AD

d)

AB + CD --> CB + AD

e)

$C_xH_y+O_2\ ->\ CO_2+H_2O$

33.

What type of reaction is the following:
$2H_2+O_2->2H_2O$

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

34.

What type of reaction is the following:
$BaCl_2+2KI\ ->\ 2KCl\ +\ BaI_2$

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

35.

What type of reaction is the following:
$C_{11}H_{24}+17O_2->\ 11CO_2\ +\ 12H_2O$

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

36.

What type of reaction is the following:
$2KI\ ->\ 2K\ +\ I_2$

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

37.

What type of reaction is the following:
$2NaHCO_3->\ Na_2CO_3+CO_2+H_2O$

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

38.

What type of reaction is the following:
$Zn\ +\ 2HCl\ ->\ ZnCl_2+H_2$

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

39.

What type of reaction is the following:
$Na_2S\ +2HCl\ ->\ H_2S+2NaCl$

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

40.

What type of reaction is the following:
$Ag_3N\ +\ 3HBr->3AgBr+H_3N$

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

41.

a process or reaction in which the system absorbs energy from its surroundings; usually, but not always, in the form of heat

a)

Endothermic Reaction

b)

Exothermic Reaction

c)

Diffusion

d)

Fission

42.

the symbolic representation of a chemical reaction

a)

Long Hand

b)

Short Hand

c)

Electron Configuration

d)

Chemical Equation

43.

A solid that is deposited from a solution

a)

Solid

b)

Liquid

c)

Product

d)

Precipitate

44.

A chemical reaction or process that absorbs heat from the surroundings

a)

Endothermic

b)

Exothermic

45.

A chemical reaction or process that releases heat.

a)

Endothermic

b)

Exothermic

46.

Which of the following models best demonstrates a balanced chemical equation?

a)

F

b)

G

c)

H

d)

J

47.

In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?

a)

H₃PO₄

b)

H₂SO₄

c)

HCIO₃

d)

H₂0

48.

What type of reaction does this graphic represent?

a)

Decomposition

b)

Double-replacment

c)

Single-replacment

d)

Synthesis

49.

What type of reaction does this graphic represent?

a)

Decomposition

b)

Double-replacement

c)

Single-replacment

d)

Synthesis

50.

What type of reaction does this graphic represent?

a)

Decomposition

b)

Double-replacment

c)

Single-replacement

d)

Synthesis

51.

What type of reaction does this graphic represent?

a)

Decomposition

b)

Double-replacment

c)

Single-replacment

d)

Synthesis

52.

Substance that changes the rate of a chemical reaction without being consumed in the reaction

a)

bonding

b)

catalyst

c)

chemical reaction

d)

activation energy

53.

This changes the mechanism of the reaction. This also changes the nature (and energy) of the transition state.

a)

catalyst

b)

activation site

c)

activation energy

d)

catalyst

54.

The blue numbers in the image below represent ________

a)

I don't know, and don't want to try

b)

coefficients

c)

subscripts

d)

none of the answers are correct

55.

The red numbers in the image below represent ________

a)

subscripts

b)

coefficients

c)

I don't know, and don't want to try

d)

None of the answers are correct

56.

Two clear colorless solutions were combined.
The student observed that the temperature changed from 25 •C to 23 •C when the solutions were combined and that a white substance rapidly formed and settled to the bottom of the container. What most likely happened to produce these results?

a)

One of the original compounds came out of solution

b)

The solutions reacted chemically

c)

Some of the water froze into ice crystals

d)

Rapid evaporation of water occurred, leaving a solid

57.

__H₂O₂ --> __H₂O + __O₂

a)

already balanced

b)

2,1,1

c)

2,2,1

d)

2,1,2

58.

__NaClO₃--> __NaCl + __O₂

a)

2,2,2

b)

2,2,3

c)

3,2,2

d)

1,2,3

59.

Balance this reaction: ____ RbNO₃ + ____ BeF₂ ----> ____ Be(NO₃)₂ + ____ RbF

a)

1,1,1,1

b)

1,2,1,1

c)

2,1,1,2

d)

2,1,2,1

60.

If an element is diatomic it should have a subscript of___

a)

1, always

b)

2, only when it is an element

c)

it shouldn't have a subscript, it should have a coefficent

d)

2, when bonded in a compound

61.

What is the charge of Iron in this compound. (Hint: think swap drop method):

Fe₃(PO₄)₂

a)

3+

b)

2+

c)

1+

d)

6+

62.

The symbol for a substance dissolved in solution is ______

a)

(s)

b)

(l)

c)

(aq)

d)

(g)

63.

Fill in the blank. (Copper has a charge of 2+)

Cu+ AgNO₃→ Ag + _____

a)

Cu(NO₃)₂

b)

CuNO₃

c)

CuAg

d)

Cu

64.

Predict the products of this synthesis reaction: H₂ + Cl₂ →

a)

HCl

b)

H₂Cl₂

c)

H₂Cl

d)

HCl₂

65.

What type of reaction is this?

2 C₆H₁₄ + 19 O₂ → 12 CO₂ + 14 H₂O

a)

Single Replacement

b)

Double Replacement

c)

Combustion

d)

Decomposition

66.

Predict the products for the this Single Replacement reaction:

K + HCl →

a)

KCl + H₂

b)

KHCl

c)

KH + Cl₂

d)

HCl + K₂

67.

Predict the products for the this Double Replacement reaction:

AgNO₃ + KCl →

a)

AgCl + KNO₃

b)

AgK + ClNO₃

c)

KAg + NO₃Cl

d)

AgCl + 3 KNO

68.

Complete the balanced equation for this Double Replacement reaction.

3 NaOH + Fe(NO₃)₃ →

a)

NaFe + OH(NO₃)₃

b)

NaNO₃ + Fe(OH)₃

c)

3 NaNO₃ + Fe(OH)₃

d)

3 NaFe + 3 (OH)NO₃

69.

Predict the product of this synthesis reaction:

Al + S₈ →

a)

AlS

b)

AlS₈

c)

Al₂S

d)

Al₂S₃

70.

Predict the products for the decomposition of aluminum oxide, Al₂O₃ →

a)

Al + O₂

b)

O + Al₂

c)

Al₂+ O₃

d)

Al + O

71.

Predict the products for the this Single Replacement reaction: (Copper has a charge of 1+)

Mg + CuCl →

a)

MgCl₂ + Cu

b)

Mg + Cu

c)

MgCu + Cl₂

d)

MgCl + Cu₂

72.

Predict the products of this single replacement reaction: Na + H₂O →

a)

NaO + H₂

b)

NaOH + H₂

c)

NaH + O₂

d)

ONaH

73.

Write a balanced reaction for this SR Reaction
Zn(s) + H₂SO₄(aq) -->

a)

Zn(SO₄)₂ + H

b)

ZnSO₄ + H₂

c)

NR

d)

Zn₂SO₄ + H₂

74.

Write a balanced reaction for this SR reaction
Sn(s) + NaNO₃(aq) -->

a)

NaSn + NO₃

b)

SnNO₃ + Na

c)

NR

d)

SnN₃O₃ + Na

75.

Write a balanced equation for this DR reactions
NaOH + Fe(NO₃)₃ -->

a)

NaFe + OH(NO₃)₃

b)

2NaNO₃ + 3Fe(OH)₃

c)

NR

d)

3NaNO₃ + Fe(OH)₃

76.

Write a balanced equation for this DR reaction
KOH(aq) + H₃PO₄(aq) -->

a)

K₃PO₄ + 3HOH

b)

KH₃ + OHPO₄

c)

NR

d)

KPO₄ + H₃OH

77.

Write a Balanced Equation for this reaction:
C₂H₄ + 2 O₂ -->

a)

C₂O₂ + H₄

b)

CO₂ + HOH

c)

NR

d)

2 CO₂ + 2H₂O

78.

Which of the following salts is insoluble?

a)

Aluminium chloride

b)

Copper (II) Sulfate

c)

Sodium chloride

d)

Calcium carbonate

79.

KNO₃

a)

Soluble

b)

Insoluble

80.

AgCl

a)

Soluble

b)

Insoluble

81.

KCl

a)

Soluble

b)

Insoluble

82.

AgNO₃

a)

Soluble

b)

Insoluble

83.

(NH₄)₂SO₄

a)

Soluble

b)

Insoluble

84.

CaSO₄

a)

Soluble

b)

Insoluble

85.

Na₂O

a)

Soluble

b)

Insoluble

Chemical Reactions Practice

Total questions: 85

Worksheet time: 2hrs 15mins

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