Free Printable Chemical Reactions

1.

A candle wick burning is an example of a _________________________

a)

physical reaction

b)

condensation

c)

neutrons

d)

chemical reaction

2.

In a ___________change, a substance changes into a different substance.

a)

Physical

b)

Chemical

3.

Which of the following IS a physical change?

a)

Getting a haircut

b)

Rusty metal

c)

A compound

d)

sour milk

4.

the starting materials in a chemical reaction

a)

Products

b)

Reactants

c)

Starters

d)

Enders

5.

The substances listed on the right side of a chemical equation are the

a)

Yields

b)

Reactants

c)

Products

d)

Precipitates

6.

The smallest particle of an element; made of electrons, protons, and neutrons

a)

Atoms

b)

Elements

c)

Molecules

d)

Products

7.

The process by which one or more substances change to produce one or more different substances

a)

Chemical Process

b)

Reactant

c)

Chemical Reaction

8.

A chemical reaction or process that releases heat.

a)

Endothermic

b)

Exothermic

9.

In the equation, 2Mg + O₂ ---> 2MgO, which are the reactants?

a)

Mg and O

b)

MgO

c)

Mg and MgO

d)

O and MgO

10.

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

a)

H₃PO₄

b)

H₂SO₄

c)

HCIO₃

d)

H₂0

11.

What are Chemical Reactions?

a)

It's when you mix substances.

b)

a process in which atoms rearrange to form new substances

c)

When something bubbles.

d)

letter and numbers showing the types and number of atoms

12.

A different chemical substance is formed when _____.

a)

water boils

b)

metal rusts

c)

ice melts

d)

rock is crushed

13.

Identify the following process: We light a matchstick.

a)

Physical change

b)

Chemical change

14.

Chemicals that help start or speed up a reaction...

a)

Reactants

b)

Products

c)

Catalysts

15.

$CH_4$

How many CARBON atoms are in this compound?

a)

1

b)

2

c)

3

d)

4

16.

$CH_4$

How many HYDROGEN atoms are in this compound?

a)

1

b)

2

c)

3

d)

4

17.

$6CO_2+\ 6H_2O\ \rightarrow\ C_6H_{12}O_{6\ }+\ 6O_2$

What is this chemical reaction?

a)

Corrosion

b)

Photosynthesis

c)

Combustion

18.

$6CO_2+\ 6H_2O\ \rightarrow\ C_6H_{12}O_{6\ }+\ 6O_2$

What is the CATALYST for this chemical reaction?

a)

Water

b)

Oxygen

c)

Sunlight

19.

$6CO_2+\ 6H_2O\ \rightarrow\ C_6H_{12}O_{6\ }+\ 6O_2$

What is a PRODUCT of this reaction?

a)

Water

b)

Carbon dioxide

c)

Glucose

20.

$6CO_2+\ 6H_2O\ \rightarrow\ C_6H_{12}O_{6\ }+\ 6O_2$

The carbon atoms are balanced with ____ on each side of the reaction.

a)

1

b)

6

c)

2

Chemical Reactions

Total questions: 20

Worksheet time: 31mins

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