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Chemical Reactions Exam

Total questions: 45

Worksheet time: 2hrs 37mins

Name
Class
Date
1.

Which type of chemical reaction has two or more reactants to make one product?

a)

combustion

b)

single displacement

c)

double displacement

d)

synthesis

e)

decomposition

2.

Identify the following chemical reaction.

2 NaBr + 1 Ca(OH)2 ----> 1 CaBr2 + 2 NaOH

a)

Synthesis (or combination)

b)

Decomposition

c)

Single displacement

d)

Double displacement

3.

Identify the following chemical reaction.

Pb + FeSO4 ----> PbSO4 + Fe

a)

Synthesis (or combination)

b)

Decomposition

c)

Single displacement

d)

Double displacement

4.

What reaction has the following general formula:

AB --> A + B

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

5.

What reaction has the following general formula:

A + CD --> C + AD

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

6.

Which chemical reaction always starts with a hydrocarbon that reacts with oxygen and produces carbon dioxide and water?

a)

Decomposition

b)

Synthesis

c)

Combustion

d)

Single Replacement

7.

Which phrase describes what happens to atoms in a chemical reaction?

a)

never lost or gained, just rearranged

b)

sometimes lost, never rearranged

c)

sometimes lost, gained, or rearranged

d)

lost or gained, never rearranged

8.
In a chemical reaction, everything to the right of the arrow is called ______________.
a)
Products
b)
Yields
c)
Molecules
d)
Reactants
9.
Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?
a)

The shape of the coal changes

b)

Oxygen is present

c)

A new substance is produced

d)

Coal is made up of more than one element

10.
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
a)
the product is doubled
b)
the product is half the mass of the reactants
c)
the mass is the same
d)
the mass changes depending on the reaction
11.

Which of the following is a compound?

a)

zinc (Zn)

b)

magnesium (Mg)

c)

sodium chloride (NaCl)

d)

potassium (K)

12.

Which of the following is an element?

a)

potassium chloride (KCl)

b)

water (H2O)

c)

carbon (C)

d)

calcium carbonate (CaCO3)

13.

What reaction has the following general formula: CxHy + O2 −>CO2 + H2OC_xH_y\ +\ O_2\ ->CO_{2\ }+\ H_2O  

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

14.

What type of reaction is the following: 2KI −> 2K + I22KI\ ->\ 2K\ +\ I_2  

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

15.

What is the number before a chemical formula called?

Example: 2H2 + O2 ---> 2H2O

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

16.

What is the Law of Conservation of Mass?

a)

It states that matter cannot be created or destroyed.

b)

It states that energy cannot be created or destroyed.

c)

It states that matter can be created or destroyed.

d)

It states that sound can be created or destroyed.

17.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
18.
__Al + __Fe3N2 -->__AlN + __Fe
a)
already balanced
b)
4,2,4,6
c)
2,1,2,3
d)
1,2,1,3
19.
__Na + __Cl2 --> __NaCl
a)
1,1,2
b)
2,1,2
c)
2,1,1
d)
already balanced
20.
__C6H12O6 + __O2 --> __H2O + __CO2
a)
1,6,6,6
b)
already balanced
c)
1,6,1,6
d)
2,12,12,12
21.
Balance this reaction: ____ BaS + ____ PtF2 ---> ____ BaF2 + ____ PtS
a)
1,1,1,1
b)
1,2,1,1
c)
1,1,1,2
d)
2,1,1,1
22.
Balance this equation
_N2 + _H2 --> _NH3
a)
1,2,3
b)
1,3,2
c)
1,1,2
d)
2,1,1
23.
Balance this equation:
MgCl2 --> Mg4+ Cl2
a)
It's already balanced.
b)
4MgCl2 --> Mg4+ 4Cl2
c)
4MgCl2 --> Mg4+ 5Cl2
d)

4MgCl2 --> Mg4+ 8Cl2

24.

Identify the type of chemical reaction

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

25.

Identify the type of chemical reaction

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

26.

Identify the type of chemical reaction

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

27.

Identify the type of chemical reaction

a)

Synthesis

b)

Decomposition

c)

Single replacement

d)

Double replacement

e)

Combustion

28.

Ni(ClO3)2 --> NiCl2 + O2

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

29.

Which type of reaction has only one reactant?

a)

synthesis

b)

Double replacement

c)

Chemical reaction

d)

decomposition

30.
Identify this type of reaction: 
Al (s) + HCl (aq) → AlCl3 (aq) + H2 (g)
a)
Precipitation
b)
Synthesis
c)
Combustion
d)
Single Replacement
31.

New substances that are created through a chemical reaction are better known as what?

a)

yield

b)

reactants

c)

products

d)

precipitates

32.

Is the forward reaction exothermic or endothermic?

a)

Exothermic

b)

Endothermic

33.

Is the reverse reaction exothermic or endothermic?

a)

Exothermic

b)

Endothermic

34.

Which letter represents the activation energy of the forward reaction?

a)

A

b)

B

c)

C

d)

D

e)

E

35.

What is the term for the minimum energy required to start a chemical reaction?

a)

Thermal energy

b)

Activation energy

c)

Potential energy

d)

Kinetic energy

36.
Question Image

Match the type of chemical reaction below.

a)

Synthesis reaction

1.

Na+ Cl2 →\rightarrow NaCl

b)

Decomposition reaction

2.

2KI −> 2K + I2​  

c)

Single displacement reaction

3.

Pb + FeSO4 ----> PbSO4 + Fe

d)

Double displacement reaction

4.

BaCl2​+2KI −> 2KCl + BaI2​

e)

Combustion reaction

5.

CH4​+O2​→CO2​+H2​O

37.
Exothermic reactions release heat energy to the surroundings.
a)
true
b)
false
38.
In an endothermic reaction the products have 
a)
more energy than the reactants
b)
less energy than the reactants
c)
the same energy as the reactants
d)
no energy
39.
What is the energy of the activated complex?
a)
75 kJ
b)
225 kJ
c)
300 kJ
d)

150 kJ

40.
How much potential energy do the products  have?
a)

20 kJ

b)

80 kJ

c)

40 kJ

d)

60 kJ

41.
What is the ΔH of this reaction?
a)
40 kJ
b)
20 kJ
c)
80 kJ
d)
60 kJ
42.
What is the PE of the reactants?
a)
100 kJ
b)
175 kJ
c)
50 kJ
d)
75 kJ
43.
What is the sign of ΔH for all endothermic reactions?
a)
Positive
b)
Negative
44.
What is the activation energy?
a)
100 kJ
b)
175 kJ
c)
50 kJ
d)
75 kJ
45.

Is the reaction exothermic or endothermic?

H2 + S + O2 --> H2SO4 ΔH = -811.13kJ

a)

ΔH is negative so it is exothermic

b)

ΔH is positive so it is exothermic

c)

ΔH is positive so it is endothermic

d)

ΔH is negative so it is endothermic

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