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Year 9 chemistry revision

Total questions: 51

Worksheet time: 51mins

Name
Class
Date
1.

What is the law of conservation of mass?

a)

In physics and chemistry, the law of conservation of ////////// states that the total energy of an isolated system remains constant; it is said to be conserved over time. This law means that energy can neither be created nor destroyed

b)

The law of conservation of /////////// says that in chemical reactions, the total mass of the products must equal the total mass of the reactants.

c)

Conservation of /////////// is a fundamental law of physics which states that the momentum of a system is constant if there are no external forces acting on the system.

2.

What is another name for combustion?

a)

reduction

b)

burning

c)

displacement

3.

is this chemical equation balanced?

a)

yes

b)

no

4.
Which of the following reactions is a combustion reaction ? 
a)
MgCO3 + O2 → MgO + CO2  
b)
C3H8 + 5O2 → 3CO2 + 4H2O 
c)
6CO2 + 6H2O → C6H12O6 + 6O2 
d)
6CO2 + 6H2O → C6H12O6 + 6O2 
5.
What is the law of Conservation of Mass?
a)
A measure of how much mass is created or destroyed. 
b)
Mass can neither be created nor destroyed during a chemical reaction. 
6.
Is oxygen metal or nonmetal?
a)
metal
b)
nonmetal
7.
What side of the periodic table are nonmetals on?
a)
left
b)
right 
c)
top
d)
bottom
8.
How many different elements are in this chemical formula: C2H2ClK3
a)
6
b)
8
c)
2
d)
4
9.
How can you tell that a metal is reacting with water?
a)
Colour change
b)
Bright light
c)
Fizzing
d)
It gets colder
10.
Which salt will be produced if magnesium react with hydrochloric acid?
a)
Magnesium oxide
b)
Magnesium sulfate
c)
Magnesium sulfide
d)
Magnesium chloride
11.
Acid + Metal --> ?
a)
Salt + Water
b)
Salt + Hydrogen
c)
Salt
d)
Hydrogen
12.
Iron + Hydrochloric acid --> ?
a)
iron sulfate + water
b)
iron + hydrogen
c)
iron chloride + hydrogen
d)
iron chloride + water
13.
Magnesium + sulphuric acid --> ?
a)
magnesium sulfate + water
b)
magnesium sulfate + hydrogen
c)
magnesium chloride + hydrogen
d)
magnesium chloride + water
14.
Which gas gives out a 'squeaky pop' when a lit splint is placed in it?
a)
hydrogen
b)
oxygen
c)
carbon dioxide
d)
nitrogen
15.

The chemical formula for hydrochloric acid is...

a)

HCl

b)

H2O

c)

HNO3

d)

NaCl

16.

Acid + Carbonate ----->

a)

salt + hydrogen

b)

salt + water + carbon dioxide

c)

salt + water

d)

salt + carbon dioxide

17.
What reactants are needed to prepare (make) magnesium nitrate?
a)
magnesium and hydrochloric acid
b)
magnesium and sulfuric acid
c)
magnesium and nitric acid
d)
magnesium and carbonic acid
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.
when colors of metals causes a color to change
a)
flamabilty
b)
corrosion
c)
precipate
d)
tarnish
20.
a metal + oxygen ----- >
a)
metal salt + hydrogen
b)
metal salt + oxygen
c)
metal oxide + oxygen
d)
metal oxide
21.
Which equation correctly shows the displacement of copper by zinc?
a)
copper + zinc sulphate --> copper sulfate + zinc
b)
zinc sulphate + copper --> copper sulfate + zinc
c)
copper sulfate + zinc --> zinc sulfate + copper
22.
Which equation correctly shows the displacement of copper by magnesium?
a)
2Mg + O2 --> 2MgO
b)
Mg + CuSO4 --> MgSO4 + Cu
c)
Mg + MgSO4 --> MgSO4 + Mg
23.

The Law of Conservation of Mass states that the total mass of the reactants should be

a)

More than the mass of the products

b)

Equal to the mass of the products

c)

Ignored during the reaction

d)

Less than the mass of the products

24.
What element rusts?
a)
carbon
b)
iron
c)
manganese
d)
potassium
25.

Magnesium chloride + Sodium → ?

a)

Sodium chloride + Magnesium

b)

Magnesium chloride + Sodium (No change)

c)

Sodium magnesium + Chlorine

26.
What conditions are required for rusting? 
a)
dry cold conditions
b)
hot damp conditions
c)
dry hot conditions
27.
What was the chemical name given to Rust ?
a)
Carbon 
b)
Iron Oxide 
c)
Iron
d)
Oxygen
28.
The major cause of Acid Rain is: 
a)
Water pollution
b)
Soil pollution
c)
Air pollution
d)
Noise pollution
29.
How does acid rain affect lakes?
a)
Increases amount of salt in lake water
b)
Lake water becomes dirty
c)
Makes lakes unfit for fish and other animals
d)
The lake becomes dry
30.

Arrange the following into a timeline:

a) The acidic water droplets combine to form clouds

b) Burning of fossil fuels gives off air pollutants

c) When clouds become heavy, they fall on earth as Acid Rain

d) Some pollutants mix with water droplets to form acids

a)

a,b,c,d

b)

b, d, a, c

c)

c,b,a,d

d)

a,c,b,d

31.
Cars have this device in their exhaust to reduce harmful gases being released 
a)
Gas collector
b)
Catalytic converter
c)
Catalyst converter
d)
Exhaust fairy
32.
Fossil fuels have impurities which are released as gases when they are burnt
a)
True
b)
False
33.
The main impurity from fossil fuel which causes acid rain is...
a)
Sulphur
b)
Carbon
c)
Hydrogen
d)
Oxygen
34.

What can you do to reduce acid rain?

a)

Use renewable resources

b)

Drive more

c)

Cut down trees

d)

Eat less meat

35.

What is our main solution?

a)

Put a filter in the sky

b)

Put a tax on fuels and fossil fuels

c)

reduce plastic use

d)

shut down all factories

36.
The main human activity that releases greenhouse gases is
a)
using bottled water
b)
burning fossil fuels
c)
texting on cellphones
d)
eating meat
37.
Worldwide, temperatures have been increasing for more than 100 years.  Is this evidence of global warming?
a)
yes
b)
no
38.
The greenhouse gas having the greatest role in human-caused global warming is
a)
methane
b)
carbon dioxide
c)
CFCs (chlorofluorocarbons)
d)
ozone
39.
Human activity is adding additional greenhouse gases to the amount that are in the atmosphere naturally
a)
True
b)
False
40.
Why is the increase of Greenhouse gasses a big issue?
a)
It causes climate change and increase in the global temerature 
b)
It can lead to a major increase in Greenhouses 
c)
It leads to more factories
d)
It causes a major decrease in people
41.
How can global warming cause sea levels to rise? Choose the best answer.
a)
by causing it to rain more often
b)
by melting glaciers and ice caps
c)
by increasing the number of undersea volcanic eruptions
d)
by creating bigger and more powerful hurricanes
42.
Why does cutting down trees increase global warming?
a)
trees soak up carbon dioxide
b)
trees provide shade which counteracts global warming
c)
trees absorbs the sun's energy without radiating back into the atmosphere
d)
trees drain greenhouse gases like methane from soil
43.
What absorbs ultraviolet rays in the atmosphere?
a)
troposphere
b)
stratosphere
c)
ozone layer
d)
greenhouse gases
44.

What chemical is responsible for breaking up the ozone?

a)

CFCs

b)

Carbon Dioxide

c)

Nitrogen

d)

Oxygen

45.
The ozone layer protects us from
a)
UV rays
b)
CFCs
c)
Increased atmospheric heat
d)
Decreased atmospheric heat
46.

CFCs are responsible for the damage caused to the ozone layer. Select ALL of chemical elements make up CFCs.

a)

Carbon

b)

Hydrogen

c)

Oxygen

d)

Fluorine

e)

Chlorine

47.
Which of these isn't in the fire triangle?
a)
Fuel
b)
Heat
c)
Oxygen
d)
Carbon dioxide
48.
What do we use limewater to test for?
a)
Carbon dioxide
b)
Water
c)
Heat
d)
Smoke
49.

What does incomplete combustion produce that complete combustion doesn't?

a)

Carbon monoxide

b)

Water

c)

Hydrogen

d)

Heat

e)

Oxygen

50.
Incomplete combustion is when there is a limited amount of oxygen.
a)
True
b)
False
51.

The word equation for combustion is: fuel + oxygen --> water + ________

a)

Carbon dioxide

b)

Limewater

c)

Hydrogen

d)

Oxygen

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