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Revision Chemical Reactions

Total questions: 23

Worksheet time: 14mins

Name
Class
Date
1.
The substances that are present before a reaction are the...
a)
reactants
b)
products
c)
both of these
d)
neither of these
2.
___________________ are the elements or compounds that are formed in a chemical
reaction.
a)
Polymers
b)
Bonds
c)
Reactants
d)
Products
3.
A change in which NEW substances are formed.
a)
Chemical change
b)
Physical change
c)
Casual change
d)
Formal change
4.
Element or compound?
H2O
a)
element
b)
compound
5.
Compounds break down into simpler substances in this type of reaction.....
a)
Double Replacement
b)
Single Replacement
c)
Synthesis
d)
Decomposition
6.

Name this reaction, CaCO3 --> CO2 + CaO

a)

Decomposition

b)

Single Replacement

c)

Synthesis

d)

Combustion

7.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
8.
Is melting an object technically known as a chemical reaction? 
a)
maybe?
b)
Yes
c)
No
9.
What is decomposition?
a)

putting substances together

b)

breaking substances down

c)

element replacing another element in a compoud

d)

burning of a subtance

10.
A change in the size, shape, or state of matter.
a)
chemical change
b)
physical change
c)
chemical reaction
d)
electron change
11.
How many elements are in H2O?
a)
1
b)
2
c)
3
d)
4
12.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
13.
Which of the following is a compound?
a)
Co
b)
O2
c)
C
d)
CO2
14.
The only way you can be certain that a chemical reaction has occurred is by? 
a)
Light has been emitted 
b)
a colour change has occurred 
c)
bubbles appear 
d)
identifying one or more new chemical products 
15.

Which symbol shows a chemical reaction has occured?

a)

A

b)

B

c)

C

d)

D

16.

A physical change is the same as a chemical change

a)

TRUE

b)

FALSE

17.

Identify the product(s) in this word equation

a)

Sodium

b)

Sodium chloride

c)

Sodium and Chlorine

d)

Sodium and sodium chloride

18.

What are the reactants in this word equation?

a)

Carbon dioxide and oxygen

b)

Carbon dioxide and water

c)

Oxygen and glucose

d)

Oxygen and water

19.

In a chemical reaction...

a)

New atoms are created

b)

Atoms rearrange

c)

Atoms are destroyed

d)

Nothing Happens

20.

In this chemical reaction zinc is a...

a)

Product

b)

Reactant

c)

Neither

21.

Magnesium reacts with oxygen to form magnesium oxide. The correct word equation is...

a)

A

b)

B

c)

C

d)

D

22.
When a CHEMICAL reaction occurs, what is made?
a)
No new substance is made.
b)
A new substance is made with new atoms formed
c)
A new substance is made, with existing atoms rearranged
d)
All substances remain the same, but physical state may change.
23.
What does this word equation represent: Iron + oxygen → Iron oxide
a)

A physical change in iron (nothing new gets made)

b)

A chemical reaction between iron and oxygen, where rust (iron oxide) is produced

c)

A chemical reaction between iron and rust, where oxygen is produced

d)

A physical change between iron and oxygen that forms a red color

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