wayground logo

Free Printable Worksheets

Font size

S
M
L
XL
Worksheets

Chapter 12 Test - Chemical Reactions and Equations

Total questions: 51

Worksheet time: 40mins

Name
Class
Date
1.

What happens in a chemical reaction?

a)

Bonds between atoms break and/or are formed

b)

New atoms are created and/or removed

c)

Protons move from one atom to another

d)

Electrons change into protons

2.

Which of the following would indicate that a chemical reaction has occurred?

a)

A new element has been created

b)

A different substance has formed

c)

The total mass has either increased OR decreased

d)

The total number of elements has either increased OR decreased

3.

BEFORE the equation is balanced, how many Hydrogen atoms are present on the reactant side?

a)

6

b)

2

c)

12

d)

8

4.

What coefficient should go in the last blank space in order for the equation to be balanced?

a)

1

b)

2

c)

3

d)

4

5.

How many sulfur atoms are present in this molecule?

a)

4

b)

3

c)

12

d)

1

6.

What does the Law of Conservation of Mass state?

a)

No new substances can be made or destroyed

b)

No new compounds can be made or destroyed

c)

No new atoms can be made or destroyed

d)

Mass cannot be lost from a physical reaction

7.

In a chemical reaction, ________________________ are changed into _______________________.

a)

Reactants; Products

b)

Electrons; Molecules/Compounds

c)

Coefficients; Subscripts

d)

New Elements; Old Elements

8.

Which type of reaction pulls in thermal energy from the environment around it?

a)

Endothermic

b)

Exothermic

9.

The y-axis shows the energy that is being stored/released during the reaction. What type of reaction is this?

a)

Exothermic

b)

Endothermic

10.
What do you call the substances on the left side of a chemical equation?
a)
yield
b)
products
c)
reactants
d)
compounds
11.
Which is NOT an indicator of a chemical change?
a)
temperature change
b)
formation of a precipitate
c)
shape change
d)
production of light
12.
Which of the following proves the Law of Conservation of Mass?
a)
thermal energy is produced
b)
a balanced chemical equation
c)
chemoluminescence
d)
formation of a precipitate
13.
A substance that undergoes a(n) _____ change becomes a new kind of substance.
a)
Chemical
b)
Physical
14.
Signs that a chemical change has occurred include
a)
a change in color
b)
the release of bubbles
c)
the production of an odor
d)
all are correct.
15.
All of the following are chemical changes except
a)
iron rusting
b)
ice cubes melting
c)
pennies tarnishing
d)
food spoiling
16.
Which of the following describes a precipitate?
a)
a liquid forms when a block of metal is heated
b)
a solid forms when one liquid is poured into another
c)
a gas forms when a solid is placed in a liquid
d)
bubbles form when an acid is poured on a rock
17.
Which is NOT an indication of a chemical change?
a)
temperature change
b)
formation of a precipitate
c)
shape change
d)
production of light
18.
Which is the name of the kind of solid substance formed in this figure?  
a)
aqueous 
b)
precipitate
c)
acid
d)
synthesis 
19.
An element plus additional element reacts to form one product is an example of which type of chemical reaction? 
a)
combustion
b)
decomposition 
c)
synthesis 
d)
single replacement
20.
Which type of reaction takes place in the presence of oxygen and produces carbon dioxide and water?
a)
double replacement 
b)
decomposition 
c)
combustion 
d)
single replacement
21.
What is a substance called if it speeds up a chemical reaction?
a)
reusable
b)
catalyst
c)
specific
d)
fragile
22.

List four factors that affects the rate of a reaction

a)

temperature

b)

concentration

c)

surface area

d)

volume

e)

catalysts

23.

A temperature increase causes the particles ......

a)

to slow down

b)

move faster

c)

collide higher

d)

in the right order

24.

How does a catalyst work in speeding up a reaction?

a)

By lowering the activation energy or reaction

b)

by giving them more energy

c)

by making them more available

25.
In an exothermic reaction, heat is ...
a)
taken in
b)
given out
26.

Why does a higher temperature increase the rate of a reaction?

a)

it increases both the frequency and energy of particle collisions

b)

it only increases the frequency of particle collisions

c)

it only increases the energy of particle collisions

d)

it reduces the activation energy of the reaction

27.

The ______________is required to break the bonds of the reactants.

a)

Carbonic energy

b)

Activation energy

c)

Plutonic energy

d)

Energi Gaib

28.

The minimum amount of energy needed for colliding particles to react is called

a)

Chemical Energy

b)

Kinetic Energy

c)

Activation Energy

d)

Potential Energy

29.
Grinding a seltzer tablet into powder increases the rate of reaction due to increased
a)
concentration
b)
surface area
c)
temperature
d)
reactants
30.

In an equation, the subscript...

a)

speeds up a reaction

b)

is the number of atoms in a chemical formula

c)

is a measure of how fast a reaction occurs

31.
The following is what type of reaction:
PbCl2 + AgNO3 → Pb(NO3)2 + AgCl
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
32.
The following is what type of reaction:
NH3 + HCl  → NH4Cl
a)
Synthesis
b)
Decomposition
c)
Single Replacement Replacement
d)
Double Replacement Replacement
33.
What type of chemical reaction is this?
Al(OH)3 → Al2O3  + H2O
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement 
34.
3Ca + 2AlCl3 --> 3CaCl2 + 2Al
a)
Synthesis
b)
Decomposition
c)
Single Displacement
d)
Double Displacement
35.
4Si   + S8   -->   2Si2S4
a)
Synthesis
b)
Decomposition
c)
Single Displacement
d)
Double Displacement
36.
C4H12 + O2 → CO2 + H2O
a)
Synthesis
b)
Combustion
c)
Single Replacement
d)
Double Replacement
37.
2Pb(NO3)2   -->   2PbO +  4NO2  +  O2
a)
Synthesis
b)
Decomposition
c)
Single Displacement
d)
Combustion
38.
3KOH + H3PO4 --> K3PO4 + 3H2O
a)
Synthesis 
b)
Decomposition
c)
Single displacement
d)
Double displacement
39.

A substance that slows down a chemical reaction

a)

concentration

b)

catalyst

c)

inhibitor

d)

activation energy

40.

What is a function of inhibitor?

a)

They act as hormones

b)

Carry genetic information

c)

used to slow the spoilage of food

d)

Control temperature

41.

What happens when a chemical bond breaks?

a)

Energy is absorbed from the surrounding area

b)

Energy is created that didn't exist before

c)

Uses energy and then disappears

d)

Energy is released into the surrounding area

42.

What happens when a chemical bond is formed?

a)

Energy is absorbed from the surroundings.

b)

Energy is created.

c)

Energy is destroyed.

d)

Energy is released into the surroundings.

43.

Chemical reactions

a)

release more energy than they absorb

b)

absorb more energy than they release

c)

release and absorb the same amount of energy

d)

release or absorb more energy depending on the type of reaction

44.
What type of reaction is shown in the photo?
a)
Exothermic
b)
Isothermic
c)
Endothermic
d)
None of the  above
45.

Endothermic reactions

a)

release more energy than they absorb

b)

absorb more energy than they release

c)

release and absorb the same amount of energy

d)

can either absorb or release more energy based on the type of reaction.

46.

Exothermic reactions

a)

absorb thermal energy

b)

release thermal energy

c)

constantly needs new energy

d)

needs more energy than it releases.

47.

Meter

a)

measurement

b)

large

c)

one

d)

middle

48.

Meso

a)

large

b)

one

c)

middle

d)

small

49.

Mono

a)

large

b)

small

c)

measurement

d)

one

50.

Micro

a)

one

b)

large

c)

small

d)

middle

51.

Macro

a)

large

b)

middle

c)

measurement

d)

small

Similar Resources on Wayground

Earth & Resources

49 questions

Earth & Resources

quiz

Worksheet

•

6th Grade

Metals, Nonmetals, Metalloids

51 questions

Metals, Nonmetals, Metalloids

quiz

Worksheet

•

6th - 8th Grade

3/3 Photosynthesis Quiz Reg.

53 questions

3/3 Photosynthesis Quiz Reg.

quiz

Worksheet

•

5th - 8th Grade

Unit 3 Test

50 questions

Unit 3 Test

quiz

Worksheet

•

6th Grade

Plants SC PASS Review

56 questions

Plants SC PASS Review

quiz

Worksheet

•

6th Grade

Chapter 15 Test Review

46 questions

Chapter 15 Test Review

quiz

Worksheet

•

6th - 8th Grade

Muscular System & joints

50 questions

Muscular System & joints

quiz

Worksheet

•

6th - 8th Grade

Saludos y Despedidad Corto

52 questions

Saludos y Despedidad Corto

quiz

Worksheet

•

6th - 8th Grade