Free Printable Chemical Reactions

1.

A substance that is formed as the result of a chemical reaction is a __________________

a)

Product

b)

Reactant

c)

Starters

d)

Enders

2.

Which one shows that a chemical reaction has occurred?

a)

dissolving

b)

melting

c)

formation of a gas

d)

bending

3.

the starting materials in a chemical reaction

a)

Products

b)

Reactants

c)

Starters

d)

Enders

4.

In the equation $2Mg+O_2\ \rightarrow\ 2MgO$ which are the reactants?

a)

Mg and O

b)

MgO

c)

Mg and MgO

d)

O and MgO

5.

A teacher is demonstrating physical and chemical changes to her class. Which action should she use to demonstrate a chemical change?

a)

cutting a piece of paper

b)

folding a piece of paper

c)

tearing a piece of paper

d)

burning a piece of paper

6.

A pure substance...

a)

is an element or a compound

b)

is an element or a mixture

c)

is a compound or a mixture

d)

is a mixture

7.

A substance that cannot be broken down into any other substance by ordinary chemical means is called

a)

molecule

b)

mixture

c)

element

d)

compound

8.

NaHCO₃ is an example of

a)

an abbreviation

b)

a compound

c)

a mixture

d)

an element

9.

What is an example of an element?

a)

Oxygen

b)

Pure water

c)

Air

d)

Table salt

10.

What are the products of the chemical reaction pictured?

a)

CH₄ and CO₂

b)

CH₄ and O₂

c)

CO₂ and 2 H₂O

d)

O₂ and H₂O

11.

In a chemical reaction, bonds are broken and new bonds are formed that create new substances. The substance(s) in which bonds that are broken are called what?

a)

Reactants

b)

Products

c)

Atoms

d)

Catalysts

12.

Identify the type of reaction that involves the building of larger molecules from smaller simpler molecules

a)

Metabolism

b)

Anabolic reaction

c)

Digestion

d)

Catabolic reaction

13.

Identify the reaction that takes in energy from the environment (e.g. to make larger molecules from smaller ones).

a)

Endothermic reaction

b)

Respiration

c)

Catabolic reaction

d)

Homeostasis

14.

Digestion would be what type of reaction?

a)

Catabolic reaction

b)

Metabolic reaction

c)

Anabolic reaction

d)

Synthesis

15.

A --> B + C

a)

Anabolic

b)

Catabolic

16.

A + B --> C

a)

Anabolic

b)

Catabolic

17.

Reactions that break down molecules

a)

anabolic

b)

burning

c)

catabolic

d)

thermal

18.

This is when heat is absorbed, it is an

a)

Exothermic reaction

b)

endothermic reaction

c)

both

d)

none

19.

When heat is released it is an

a)

exothermic reaction

b)

endothermic reaction

c)

both

d)

none

20.

Fireworks are an example of

a)

exothermic

b)

endothermic

c)

both

d)

none

21.

An ice pack in an example of

a)

exothermic

b)

endothermic

c)

both

d)

none

22.

photosynthesis is an example of

a)

Exothermic reaction

b)

Endothermic reaction

c)

both

d)

none

23.

Frying an egg is an example of

a)

exothermic reaction

b)

endothermic reaction

c)

both

d)

none

24.

In an exothermic reaction, heat is ...

a)

taken in

b)

given out

25.

In an endothermic reaction, heat is ...

a)

taken in

b)

given out

26.

If a chemical reaction is EXOTHERMIC, the temperature would....

a)

Stay the same

b)

Increase

c)

Decrease

27.

What type of reaction occurs in a hand warmer?

a)

exothermic

b)

endothermic

28.

If they energy required to break the bonds is greater than the energy given out by making new bonds the reaction is

a)

Exothermic

b)

Endothermic

c)

Neutralisation

29.

$O_2\left(g\right)\ +\ 2\ H_2\ \left(g\right)\ \rightarrow\ 2\ H_2O\ \left(g\right)\ +\ Energy$

a)

endothermic

b)

exothermic

30.

$6\ CO_2+\ 6\ H_2O\ +\ Energy\ \rightarrow\ C_6H_{12}O_6\ +\ 6\ O_2$

a)

endothermic reaction

b)

exothermic reaction

Chemical Reactions

Total questions: 30

Worksheet time: 32mins

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