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Yr 8 Chemistry revision KS3

Total questions: 80

Worksheet time: 43mins

Name
Class
Date
1.

Is glass breaking a chemical or physical change?

a)
chemical
b)
physical
2.
Is a a rusting bicycle a chemical or physical change?
a)
chemcial
b)
physical
3.
Is melting ice a chemical or physical change?
a)
chemical
b)
physical
4.

Boiling Water

a)

Physical Change

b)

Chemical Change

5.

Match the following:

a)

Physical Changes

1.

Changes that change the appearances of the substance, not is identify.

b)

Chemical Changes

2.

changes that cause a substance to change into a new substance

c)

Freezing, Grinding, Chopping, Tearing, Evaporating

3.

Examples of Physical Changes

d)

Combustion, Rusting, Burning, Corroding

4.

Examples of Chemical Changes

6.

where are the products in an equation?

a)

The products are on the right side of the equation

b)

The products are on the left side of the equation

7.

Combining substances to form new substances is called

a)

Chemical reaction

b)

Physical reaction

c)

Exothermic reaction

d)

Endothermic reaction

8.

Galvanizing is a process of:

a)

Applying a Zinc coating to bare steel

b)

Washing the body with the phosphate coating

c)

dipping a body in E-COAT

d)

Chemically etching primer to steel

9.

Which of the following is / are examples of sacrificial protection against rusting?

a)

Iron object coated with tin

b)

Underground iron pipes connected to magnesium bars

c)

Iron railings coated with paint

10.

Which of the following is / are examples of sacrificial protection against rusting?

(1) Iron object coated with tin

(2) Underground iron pipes connected to magnesium bars

(3) Iron railings coated with paint

a)

(1) only

b)

(2) only

c)

(1) and (3) only

d)

(2) and (3) only

11.

What is the chemical nature of rust?

a)

iron (II) oxide

b)

hydrated iron (II) oxide

c)

iron (III) oxide

d)

hydrated iron(III) oxide

12.

Is this an example of corrosion?

a)

Yes

b)

No

13.
Iron rust in the presence of:
a)
Vacuum
b)
Moisture
c)
Oxygen
d)
Moisture and Oxygen
14.

What is an ore?

a)

A combination of carbon and iron

b)

A combination of metal and other elements

c)

A combination of elements and oxide

d)

A combination of metal and carbon

15.

Which of the following methods can prevent rusting?

a)

applying grease on objects made from iron

b)

painting steel objects

c)

cover steel and iron objects with a damp cloth

d)

cover steel objects with non-rusty material

16.

An investigation was carried out by year 5 pupils to study the factors that cause rusting. What is the function of anhydrous calcium chloride in this investigation?

a)

To protect the iron nail

b)

To increase the rate of the rusting process

c)

To absorb the moisture in the air

d)

To supply oxygen in the test tube

17.

Which nail rusts first?

a)

Nail in test tube A

b)

Nail in test tube C

c)

Nail in test tube E

d)

Nail in test tube F

18.

How do you prevent this food can from rusting?

a)

painting

b)

apply oil or grease

c)

coating with plastic

d)

plating with non rusty metal

19.

What element rusts?

a)

carbon

b)

manganese

c)

iron

d)

potassium

20.

What two things cause Iron to Rust ?

a)

Air and Oxygen

b)

Water and Carbon dioxide

c)

Oxygen and Water

d)

Carbon dioxide and Air

21.

Neutralisation is a ------------ change

a)

chemical reversible

b)

chemical irreversible

c)

Physical

d)

Cannot say

22.

Complete the word equation below:

Acid + alkali --> ............... + water

a)

water

b)

salt

c)

gold

d)

metal

23.

The image shows a pH scale. Which option indicates a strong alkali?

a)

a

b)

b

c)

c

d)

d

24.

The image shows a pH scale. Which option indicates a strong acid?

a)

a

b)

b

c)

c

d)

d

25.

What is the substance with a neutral pH of 7?

a)

Milk

b)

Water

c)

Orange Juice

d)

Blood

26.

Which of these substances is an acid?

a)

Ammonia

b)

Oven cleaner

c)

Vinegar

d)

Soap

27.

A purple colour when using universal indicator indicates the solution is _______________.

a)

neutral

b)

acidic

c)

alkali

d)

blackcurrant juice

28.

What is the range of the pH scale?

a)

0 -14

b)

1 - 14

c)

1 - 6

d)

12 - 14

29.

An alkali can react with an acid. This process is known as?

a)

balancing

b)

acidification

c)

combustion

d)

neutralisation

30.

What type of solution has a pH of 12?

a)

Neutral

b)

Acidic

c)

Alkali

31.

What is the percentage of oxygen in the earth's atmosphere?

a)

10%

b)

15%

c)

20%

d)

25%

32.

What is the effect of oxygen on a lighted splint?

a)

Oxygen extinguishes a lighted splint

b)

Oxygen makes a lighted splint burn even more

c)

Oxygen extinguishes a lighted splint with a pop sound

d)

Oxygen does not have any effect on a lighted splint

33.

What is formed when copper reacts with oxygen?

a)

carbon dioxide and water

b)

carbon dioxide

c)

copper (II) oxide

d)

copper dioxide

34.

The percentage of oxygen in the atmosphere is 20%.

How many cm3 of oxygen would you find in 50 cm3 of air?

a)

5 cm3

b)

10 cm3

c)

15 cm3

d)

20 cm3

35.

In the experiment shown above, when should we stop passing the air in the syringe back and forth over the heated copper?

a)

When all the copper turns black

b)

When the volume of air remains the same in the syringes

c)

When the copper glows inside the tube

d)

We just pass it 6 times back and forth

36.

______________ is a combustible gas.

a)

Nitrogen

b)

Oxygen

c)

Argon

37.

Match the chemical symbol to the element...

a)

carbon

1.

C

b)

nitrogen

2.

N

c)

oxygen

3.

O

d)

sulphur

4.

S

e)

magnesium

5.

Mg

38.
What elements make up Copper sulphate? CuSO4
a)
copper, sulphate
b)
copper, sulphur
c)
copper, sulphur and oxygen
d)
copper and oxygen
39.
Magnesium and hydrochloric acid are mixed together in a beaker, hydrogen is produced as well as magnesium chloride.
Choose correct word equation
a)
magnesium chloride + hydrogen --> magnesium + hydrochloric acid
b)
magnesium + hydrochloric acid --> magnesium chloride + hydrogen
40.
Iron + Hydrochloric acid --> ?
a)
iron sulfate + water
b)
iron + hydrogen
c)
iron chloride + hydrogen
d)
iron chloride + water
41.
Salts that are made with carbonic acid are called ______________.
a)
chlorides
b)
sulfates
c)
nitrates
d)
carbonates
42.

Acid + Carbonate ----->

a)

salt + hydrogen

b)

salt + water + carbon dioxide

c)

salt + water

d)

salt + carbon dioxide

43.
Magnesium + sulphuric acid --> ?
a)
magnesium sulfate + water
b)
magnesium sulfate + hydrogen
c)
magnesium chloride + hydrogen
d)
magnesium chloride + water
44.
Zinc + nitric acid --> ?
a)
zinc sulfate + water
b)
zinc sulfate + hydrogen
c)
zinc nitrate + hydrogen
d)
zinc chloride + water
45.
What reactants are needed to prepare (make) copper carbonate?
a)
copper and hydrochloric acid
b)
copper and sulfuric acid
c)
copper and nitric acid
d)
copper and carbonic acid
46.

How do you know when a reaction between a metal and an acid is complete?

a)

All the metal is dissolved

b)

There is a color change in the acid

c)

Bubbles stop forming!

d)

All the acid evaporates

47.
Hydrogen Peroxide's chemical formula
a)
H2O
b)
H2O2
c)
CH4
48.
What is it called when a reaction breaks a substance into 2 or more other substances?
a)
Combination Reaction
b)
Decomposition Reaction
c)
Splitting Reaction
49.
The reaction made some heat. This is called...
a)
Endothermic
b)
Exothermic
50.

Which of the following is the simplest form of substance?

a)

solution

b)

compound

c)

element

d)

mixture

51.

When one or more substance is combined it is called __________________.

a)

compound

b)

element

c)

mixture

d)

solution

52.

Which of the following statements describes an element?

a)

It contains only one kind of atom.

b)

It can be decomposed by ordinary chemical means.

c)

It is composed of atoms of two or more elements that bond together.

d)

It has unique properties that are different from the properties of its individual elements.

53.

Which of the following statements describes a compound?

a)

It contains only one kind of atom.

b)

It can be separated by physical means.

c)

It cannot be decomposed into simpler types of substances.

d)

It consists of atoms of two or more different elements bond together.

54.
A student places a piece of a potato into a container of hydrogen peroxide. One observation the student makes is that bubbles form around the potato. The presence of bubbles might indicate the formation of a new substance because bubbles - 
a)
could show that a gas is forming
b)
always rise to the top of a liquid. 
c)
are almost always perfectly spherical.
d)
usually burst after a few minutes.
55.

What are the chemicals required to produce oxygen in the lab?

a)

Water

b)

Hydrogen peroxide

c)

manganese

d)

manganese (IV) Oxide

56.

What type of reaction is used to prepare oxygen in the lab?

a)

Displacment

b)

Decomposition

c)

Precipitation

d)

Synthesis

57.

The catalyst used to prepare oxygen is:

a)

manganese (IV) oxide

b)

Salt

c)

Sugar

d)

Hydrogen peroxide

58.

Which element forms an oxide that produces the most acidic solution

a)

Lithium

b)

Carbon

c)

Magnesium

d)

sulphur

59.

What colour are the oxides of lithium and magnesium

a)

white and black

b)

red and pink

c)

grey and black

d)

grey and white

60.

Metals react with acids to produce a gas

a)

Carbon dioxide

b)

Nitrogen

c)

Hydrogen

d)

Oxygen

61.

Colour of copper sulphate solution is

a)

Green

b)

Blue

c)

Black

d)

White

62.

Colour of iron sulphate is

a)

Blue

b)

Green

c)

Black

d)

None of the above

63.

Red litmus paper turns blue when it is dipped in

a)

Acidic solution

b)

Basic solution

c)

Neutral solution

d)

None of the above

64.

Which test is for carbon dioxide?

a)

Re-lights a glowing splint

b)

Limewater turns cloudy

c)

Squeaky pop

d)

Litmus turns red then whit

65.

Which gas am I testing for?

a)

Carbon dioxide

b)

Chlorine

c)

Hydrogen

d)

Oxygen

66.

In a chemical change, new substances are formed, for example

a)

heating glass and bending it

b)

melting an ice

c)

burning of wood

d)

boil water

67.

What is this a diagram of?

(a)  

68.

What does anhydrous mean?

a)

without water

b)

with water

69.

What does hydrated mean?

a)

without water

b)

with water

70.

What colour is anhydrous copper sulphate?

a)

white

b)

blue

71.

what colour is hydrated Copper Sulphate?

a)

White

b)

Blue

72.

What are two reactions that can be used to produce copper sulfate?

a)

Copper Oxide + Sulphuric Acid

b)

Copper Carbonate + Sulphuric Acid

c)

Copper Oxide + Nitric Acid

d)

Sodium Carbonate + Hydrochloric Acid

e)

Copper Carbonate + Hydrochloric Acid

73.

What would be sensible precautions to reduce the risks of this experiment?

a)

Wear goggles

b)

Tie long hair back

c)

Wash hands afterwards

d)

Spray equipment with water to cool it down

e)

Do the experiment standing up with stool pushed under table.

74.

In the thermal decomposition of calcium carbonate:

Calcium carbonate --> Calcium oxide + ?

HINT: gas

a)

oxygen

b)

calcium

c)

carbon monoxide

d)

carbon dioxide

75.

When Magnesium ribbon is ignited using a candle flame, it burns with a __________.

a)

sparkling red light

b)

dull yellow light

c)

bright green light

d)

brilliant white light

76.

Which is not a way to prevent rusting?

a)

oiling the surface of metal

b)

heating the surface of metal

c)

painting the surface of metal

d)

greasing the surface of metal

77.

Match the following

a)
1.

pure element

b)
2.

pure compound

c)
3.

mixture of elements

d)
4.

mixture of compounds

e)
5.

mixture of elements and compounds

78.

Elements only

a)

b)

c)

d)

79.

A pure substance is made of two or more elements chemically combined is a(n)

a)

element

b)

compound

c)

mixture

80.

Is SULFUR (S) an element or a compound?

a)

ELEMENT

b)

COMPOUND

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