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11) Chemical Changes

Total questions: 30

Worksheet time: 26mins

Name
Class
Date
1.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
formation of a gas
d)
dissolving
2.
Is melting butter for popcorn a chemical or physical change?
a)
chemical
b)
physical
3.
Which of the following is NOT an example of a physical change?
a)
crumpled paper
b)
pencil sharpening
c)
shrunken clothing
d)
rust
4.
Which of these is a result of a chemical change?
a)
A mixture
b)
A solution
c)
A new substance
d)
Melting or freezing
5.
Which type of reaction takes place in the presence of oxygen and produces carbon dioxide and water?
a)

Neutralisation

b)

Thermal decomposition 

c)
combustion 
d)

rusting

6.

True or false, combustion must result in the production of carbon dioxide

a)

True

b)

False

7.

Which process does not produce carbon dioxide?

a)

combustion of hydrocarbons

b)

photosynthesis

c)

respiration

d)

acid + carbonate reaction

8.
What is the term for when a large molecule is broken down into smaller molecules?
a)

neutralisation

b)
decomposition 
c)

combustion

d)
melting
9.

Which metals rusts?

a)

Copper

b)

manganese

c)

iron

d)

potassium

10.

What are the best conditions required for rusting?

a)

cold and dry

b)

cold and damp

c)

hot and damp

d)

hot and dry

11.

What does NOT prevent rusting

a)

Painting

b)

Washing with water

c)

Oiling

d)

Galvinising

12.

Which of the following is a neutralisation reaction?

a)

sulfuric acid + magnesium → magnesium sulfate + hydrogen gas

b)

methane + oxygen → carbon dioxide + water

c)

hydrochloric acid + potassium hydroxide → potassium chloride +water

d)

calcium carbonate → carbon dioxide + calcium oxide

13.
An acid reacts with metal to produce 
a)
Carbon dioxide 
b)
Hydrogen gas
c)
Hydrogen gas and water 
d)
Salt and hydrogen gas 
14.
A neutralisation reaction produces 
a)
An acid 
b)
A neutral substance 
c)
Only water 
d)
Salt and water 
15.
An acid reacts with a metal carbonate to produce 
a)
Salt, water and hydrogen gas
b)
Salt, water and carbon dioxide
c)
Limewater
d)
Salt and water 
16.
What type of reaction is the following: 
HCl  + Zn --> ZnCl2 + H2
a)
Neutralisation
b)
Acid and a metal 
c)
Acid and a carbonate 
d)
Ionic 
17.

Complete the following reaction: Sulfuric acid + sodium carbonate --> 

a)
Carbon dioxide + water 
b)
calcium carbonate + water + carbon dioxide 
c)
Sodium sulphate + water + carbon dioxide 
d)
Sodium chloride + water + carbon dioxide 
18.
Complete the following reaction:
Hydrochloric acid + magnesium hydroxide --> 
a)
Magnesium chloride + water 
b)
Magnesium + water
c)
Magnesium chloride + hydrogen gas 
d)
Magnesium chloride + water + carbon dioxide 
19.
Pure water is _______ on the pH scale.
a)
Acid
b)
Base
c)
Neutral
20.
What is the range of pH values in an acidic solution?
a)

1-6

b)
8-14
c)

7

d)

6-8

21.

If the pH of a solution is 9, it is a(n)

a)
acid
b)

alkali

c)
both
d)
none
22.
What are properties of acids?
a)
Bitter, slippery, ph above 7
b)
Sour, reacts with metals, ph below 7
c)
Sour, reacts with metals, ph above 7
d)
Bitter, ph of 7, does not react with metals
23.

The pH of 4 solutions were measured in a lab. Which solution is the most acidic?

a)
b)
c)
d)
24.

The pH of 4 solutions were measure in a lab. Which of the solutions is the most basic (alkaline)?

a)
b)
c)
d)
25.

Holly has an unknown substance in a beaker. She wants to determine the relative pH of the unknown substance. She places a piece of blue litmus paper into the substance, and the litmus paper stays blue.

What are the possible conclusions from this observation?

a)

is an alkai.

b)

has a neutral pH.

c)

is an acid.

d)

does not have a pH.

26.

Which of the following statements is correct?

a)

Blue litmus paper turns red when placed in a base.

b)

Red litmus paper turns blue when placed in a base.

c)

Blue litmus paper stays blue when placed in an acid.

d)

Red litmus paper stays red when placed in a base.

27.

Which of the following is acidic?

a)

shampoo

b)

baking soda

c)

orange juice

d)

water

28.

What is the gas that is produced when an acid reacts with a reactive metal?

a)

carbon dioxide

b)

oxygen

c)

hydrogen

d)

nitrogen

29.

What is the gas that is produced when an acid reacts with a zinc carbonate?

a)

carbon dioxide

b)

oxygen

c)

hydrogen

d)

nitrogen

30.

A unknown liquid that is suspected to be an acid is found in the lab. How do we test to determine if it is an acid?

a)

taste it to see if it is sour

b)

use a red litmus paper

c)

use a blue litmus paper

d)

add magnesium to it and see if bubbles are produced

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