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Chemical Reactions

Total questions: 52

Worksheet time: 40mins

Name
Class
Date
1.

Classify:

Fe + CuSO4 -> Cu + FeSO4

a)

Double Displacement

b)

Decompostion

c)

Single Displacement

d)

Synthesis

e)

Combustion

2.

Which type of reaction always produces carbon dioxide + water?

a)

double displacement

b)

decomposition

c)

combustion

d)

single displacement

e)

synthesis

3.

Classify

Fe + O2 → Fe2O3

a)

synthesis

b)

decomposition

c)

double displacement

d)

single displacement

4.
Which of the following general formulas represents a single-displacement reaction?
a)
AB → A + B   
b)
A + B → AB
c)
A + BC → AC + B
d)
AB + CD → AD + CB
5.

The formula AB → A+B represents what type of chemical reaction?

a)

synthesis

b)

decomposition

c)

single displacement

d)

double displacement

6.

Classify:

PbCl2 + AgNO3 → Pb(NO3)2 + AgCl

a)

Synthesis

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

7.

Classify:

4Si + S8 --> 2Si2S4

a)

Synthesis

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

8.

Classify:

3Ca + 2AlCl3 --> 3CaCl2 + 2Al

a)

Synthesis

b)

Decomposition

c)

Single Displacement

d)

Double Displacement

9.

Classify:

2NO2 --> N2 + 2O2

a)

Synthesis

b)

Decomposition

c)

Single displacement

d)

Combustion

10.

Classify:

C5H10O4 + O2 --> CO2 + H2O

a)

Decomposition

b)

Single Displacement

c)

Combustion

d)

Double Displacement

e)

Synthesis

11.
Heat is another name for-
a)
thermal energy
b)
magnetic energy
c)
electrical energy
d)
mechanical energy
12.
A(n) ___ is a substance that speeds up a chemical reaction without being permanently changed itself.
a)
catalyst
b)
inhibitor
c)
exotherm
d)
endotherm
13.

In a chemical reaction, the arrow means _______

a)

produces

b)

makes

c)

equals

d)

greater than

14.
What type of reaction produces a precipitate?
a)
single displacement
b)
synthesis
c)
double displacement
d)
decomposition
15.
What does it mean for a chemical equation to be balanced?
a)
The solid products weigh the same as the reactants.
b)
The same number of atoms of each element is on both sides of the equation.
c)
The reactants and the products are written with the same coefficients.
d)
The number of reactants is equal to the number of products.
16.
In chemical equations, ___ represent the number of units of each substance.
a)
coefficients
b)
reactants
c)
products
d)
precipitates
17.
New substances produced by a chemical reaction are ___.
a)
resultants
b)
reactants
c)
coefficients
d)
products
18.
In a chemical reaction, the substance that reacts.
a)
catalyst
b)
reduction
c)
reactant
d)
precipitate
19.

Putting gas on fire is an example of a(n) _____________

a)

inhibitor

b)

product

c)

catalyst

d)

reactant

20.
Substance that slows down a chemical reaction or prevents it from occurring by combining with a reactant.
a)
inhibitor
b)
reduction
c)
oxidation
d)
precipitate
21.

Thought of as unit managers

a)

coefficients

b)

subscripts

c)

superscripts

22.

Type of energy required when reactants bonds are broken

a)

activation energy

b)

chemical energy

c)

thermal energy

d)

light energy

23.

chemical reactions that release energy

a)

exergonic reaction

b)

endergonic reaction

c)

exothermic reaction

d)

endothermic reaction

24.

when the energy given off is primarily in the form of thermal energy

a)

exergonic reaction

b)

endergonic reaction

c)

exothermic reaction

d)

endothermic reaction

25.

A chemical reaction that absorbs energy

a)

Exergonic reaction

b)

endergonic reaction

c)

exothermic reaction

d)

endothermic reaction

26.

When the energy absorbed by the reaction is in the form of thermal energy

a)

exergonic reaction

b)

endergonic reaction

c)

exothermic reaction

d)

endothermic reaction

27.

Wood burning is an example of which type of reaction

a)

exergonic reaction

b)

exothermic reaction

c)

endergonic reaction

d)

endothermic reaction

28.

Baking is an example of which type of reaction

a)

exergonic reaction

b)

exothermic reaction

c)

endergonic reaction

d)

endothermic reaction

29.

The total amount of energy remains the same, even in a chemical reaction

a)

Law of Conservation of Mass

b)

Law of Conservation of Energy

c)

Le Chatelier's Principle

d)

Lavosier's Principle

30.

Who established that the mass of the products always equals the mass of the reactants?

a)

Le Chatelier

b)

Antoine Lavosier

c)

Isaac Newton

d)

Einstein

31.

The rate at which reactants change into products

a)

reaction rate

b)

collision model

c)

reversible reaction

d)

equilibrium

32.

States that atoms, ions, and molecules must collide in order to react

a)

collision model

b)

chemical reaction

c)

Le Chatelier's Principle

d)

equilibrium

33.

Increasing the temperature causes reactions to occur

a)

more rapidly

b)

slower

c)

at the same rate

34.

Increased surface area __________ the rate of chemical reactions

a)

increases

b)

decreases

c)

doubles

d)

triples

35.

Food preservatives are examples of a(n)

a)

catalyst

b)

inhibitor

36.

A reaction that can occur in both the forward and reverse directions

a)

double reaction

b)

reversible reaction

c)

equilibrium

d)

concentration

37.

State in which the forward and reverse reactions or processes proceed at equal rates

a)

reversible reaction

b)

exothermic reaction

c)

equilibrium

d)

endothermic reaction

38.

What type of reaction is indicated with double reaction arrows?

a)

combustion

b)

Equilibrium

c)

All chemical reactions

d)

Double Displacement Reaction

39.

states that if a stress is applied to a system at equilibrium, the equilibrium shifts in the direction that opposes the stress

a)

Law of Conservation of Energy

b)

Le Chatelier's Principle

c)

Lavosier's Principle

d)

Equilibrium

40.

anything that disturbs equilibrium

a)

inhibitor

b)

catalyst

c)

stress

41.

Which of the following is not an example of a stress?

a)

changing the concentration

b)

changing the surface area

c)

changing the temperature

d)

changing volume and pressure

e)

all are examples of a stress

42.

two or more substances combine to form another substance

a)

combustion reaction

b)

synthesis reaction

c)

decomposition reaction

d)

single displacement reaction

e)

double displacement reaction

43.

Occurs when one substance breaks down into two or more substances

a)

combustion reaction

b)

synthesis reaction

c)

decomposition reaction

d)

single displacement reaction

e)

double displacement reaction

44.

When one element replaces another element in a compound

a)

combustion reaction

b)

synthesis reaction

c)

decomposition reaction

d)

single displacement reaction

e)

double displacement reaction

45.

The positive ion of one compound replaces the positive ion of the other to form two new compounds

a)

combustion reaction

b)

synthesis reaction

c)

decomposition reaction

d)

single displacement reaction

e)

double displacement reaction

46.

Nickel used to increase the rate of methane formation is an example of a(n)

a)

catalyst

b)

inhibitor

47.

Brushing the cut edges of fruits with lemon juice to prevent darkening due to air is an example of a(n)

a)

catalyst

b)

inhibitor

48.

Balance the following equation:

____ H2O ------> _____ H2 + ________ O2

a)

3, 3, 2

b)

2, 1, 2

c)

3, 3, 1

d)

2, 2, 1

49.

Balance the following equation:

_____ Cl2 + ____ KO -----> _______KCl + ______ O2

a)

1, 2, 2, 2

b)

1, 2, 1, 2

c)

1, 2, 1, 1

d)

1, 2, 2, 1

50.

Balance the following equation:

____ Ag2(SO4) + ______ AlCl3 ------> ___ AgCl + ____ Al2(SO4)3

a)

3, 2, 6, 2

b)

3, 2, 6, 1

c)

3, 4, 3, 1

d)

2, 6, 2, 3

51.

Balance the following equation:

___ C3H6 + ___ O2 -----> ____ CO2 + _____ H2O

a)

1, 3, 3, 3

b)

2, 6, 6, 3

c)

2, 9, 6, 6

d)

2, 9, 6, 3

52.

The generalized formula: AB + CD ----> AD + CB describes which type of reaction?

a)

synthesis reaction

b)

decomposition reaction

c)

single displacement reaction

d)

double displacement reaction

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