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Worksheets

Year 8 Chemistry

Total questions: 80

Worksheet time: 48mins

Name
Class
Date
1.
When the temperature of matter increases the particles...
a)
speed up and move closer
b)
speed up and move farther apart
c)
slow down and move closer together
d)
slow down and move farther apart
2.
Molecules are closest together in a 
a)
Solid
b)
Liquid
c)
Gas
d)
plasma
3.
What does this picture represent? 
a)
solid
b)
liquid
c)
gas
d)
plasma
4.
Which of the following is NOT an example of a chemical reaction?
a)
Wood Burning
b)
A cake baking in an oven
c)
Melting Ice Cream
d)
Mixing Vinegar and Baking Soda
5.
Which of the following is a chemical change?
a)
the rusting of iron
b)
dissolving salt in water
c)
melting an ice cube
d)
bending a copper wire
6.
What is the chemical symbol for the element hydrogen
a)
H
b)
He
c)
h
d)
he
7.
What is the chemical symbol for the element Silicon
a)
S
b)
Si
c)
si
d)
Sl
8.
What is the chemical symbol for the element copper?
a)
co
b)
c
c)
Cu
d)
cu
9.
What is the chemical symbol for the element Chlorine
a)
C
b)
Cl
c)
cl
d)
Ch
10.
What is the chemical symbol for the element Zinc
a)
Z
b)
Zn
c)
Zr
d)
zn
11.
What element is represented by the Chemical symbol Mg
a)
Manganese
b)
Magnesium
c)
Molybdenum
d)
Mitrium
12.
What is the chemical symbol for the element Calcium
a)
C
b)
Ca
c)
Cl
d)
CL
13.
What is the chemical symbol for the element Sodium
a)
Na
b)
So
c)
S
d)
Sd
14.
Which part of an atom is POSITIVELY charged?
a)
protons
b)
neutrons
c)
electrons
d)
atoms
15.
What part of an atom is NEGATIVELY charged?
a)
protons
b)
neutrons
c)
electrons
d)
atoms
16.
A solute is...
a)
A mixture of a liquid with a solid or a gas. 
b)
The solid or gas that dissolves in a solution.
c)
The liquid in which a solid or gas dissolves.
d)
The mass of a substance that can dissolve in 100g of water.
17.
A saturated solution...
a)
does not dissolve.
b)
is the mass of substance that can dissolve in 100g of water.
c)
is a solution that can take in more solid. 
d)
is a solution that contains the greatest mass of a solid that can dissolve. It contains undissolved solid.
18.
What words fit the gaps in the following paragraph?
Chromatography separates substances in __________.
It works if all the substances in the mixture are soluble in __________. 
The picture made by chromatography is called_________.
a)
pencils, ink, chromatodrawing.
b)
ink, different solvents, chromatopicture.
c)
a mixture, the same solvent, chromatogram.
d)
a solution, pencil, chromatograph.
19.
The number at the top of each square on the periodic table is the ...
a)
atomic number
b)
atomic mass
c)
Chemical Symbol
d)
Element Name
20.
A gas
a)
has a definite shape but no definite volume
b)
has a definite volume but no definite shape
c)
has fast-moving particles
21.
Define a liquid.
a)
Indefinite shape, indefinite volume
b)
Definite shape, definite volume
c)
Found in stars
d)
Definite volume, indefinite shape
22.
What term describes a solid changing to a gas?
a)
Deposition
b)
Sublimation
c)
Evaporation
d)
Freezing
23.

Which of the following is a correct description for solids?

a)

closely arranged and in fixed positions

b)

closely arranged and vibrate in fixed positions

c)

closely arranged and can move around

24.

Which statement about the molecules in the gas carbon dioxide is correct?

a)

The molecules are close together.

b)

The molecules are diatomic.

c)

The molecules move randomly.

d)

The molecules all move with the same speed.

25.
Which of the following statements about the particle of a gas is true?
a)
Gases can be compressed because their particles are smaller than those of liquids or solids.
b)
Gases can be compressed because there is plenty of space between their particles.
c)
Gases can be compressed because they have low boiling points.
d)
Gases can be compressed because their particles are more elastic than those of liquids or solids.
26.
An inflated balloon is placed in a refrigerator. Which statement describes the movement of the gas particles in the balloon?
a)
The particles move more slowly and become closer together.
b)
The particles move more slowly and become further apart.
c)
The particles move faster and become closer together.
d)
The particles move faster and become further apart. 
27.

Diffusion is the free movement of particles from an area of __________ concentration to an area of ________ concentration.

a)

High to high

b)

High to low

c)

Low to low

d)

Low to high

28.

An increase in temperature does what to diffusion?

a)

Speeds it up

b)

Slows it down

c)

Stops it

d)

No effect

29.

What will happen to the red particles in this picture? (pretend the membrane is fully permeable)

a)

The red particles will stay where they are

b)

The red particles will move to the left

c)

The red particles will move to the right

d)

The red particles cannot move

30.

Pollen grains suspended in water exhibit Brownian motion. How does a particle undergoing Brownian motion move?

a)

In smooth curves

b)

Randomly

c)

Orderly with a pattern

d)

In straight lines with no change of direction

31.

The above image of KMnO4 (Potassium Permanganate) dissolving in water is an example of which evidence (s) of the particulate theory of Matter?

a)

Diffusion

b)

Osmosis

c)

Surface Tension

d)

Brownian's Motion

32.

which of the following are NOT an example of physical change?

a)

Change in shape

b)

Change in size

c)

Change in temperature

d)

Change in state

33.

how many electrons can fit in the first electron shell?

a)

2

b)

8

c)

6

d)

12

34.

if the atomic number of oxygen is 8 and the mass number is 16, then the number of electrons is

a)

24

b)

8

c)

16

d)

you can't tell

35.

the atomic mass of an atom is the number of

a)

Electrons and Neutrons

b)

Electrons and Protons

c)

Protons and Neutrons

d)

Electrons, Protons and Neutrons

36.

How many different elements make up this compound?


NaCl

a)

1

b)

2

c)

3

d)

4

37.

All matter is made up of

a)

very large particles

b)

solids that cannot be crushed

c)

very small particles

d)

energised atoms

38.

What change of state occurs at point 4?

a)

solid to liquid

b)

liquid to gas

c)

gas to liquid

d)

liquid to solid

39.

The state of matter at point 5 is a ____________

a)

solid

b)

liquid

c)

gas

d)

all of the above

40.

Is the image a heating curve or cooling curve?

a)

heating

b)

cooling

41.

Which is the least dense?

a)

hot water

b)

cold water

42.

Why should you not fill up your water bottle to the top when freezing it?

a)

The water volume will shrink

b)

The water volume will expand

c)

The water volume will stay the same

43.

When mixing the same amount of water and alcohol together, the final volume will ______________

a)

increase

b)

decrease

c)

stay the same

44.

When you push down the handle of a bike pump, and block the end, the air volume__________ and the air pressure __________:

a)

increases, increases

b)

increases, decreases

c)

decreases, increases

d)

decreases, decreases

45.

A hot air balloon works because

a)

hot air rises, some air escapes, and the density decreases

b)

hot air sinks, no air escapes, and the density increases

c)

hot air rises, no air escapes, and the density decreases

d)

hot air sinks, some air escapes, and the density increases

46.

Water is a ________

a)

atom

b)

element

c)

compound

47.

Which of the following is NOT an atom of CuSO4?

a)

sulfur

b)

sodium

c)

copper

d)

oxygen

48.

On the periodic table, Fe is

a)

copper

b)

sulfur

c)

iron

d)

potassium

49.

At room temperature, metals are usually

a)

solid

b)

liquid or gas

50.

All atoms contain an equal amount of _______

a)

protons and neutrons

b)

protons and electrons

c)

electrons and neutrons

51.

The X axis is labeled with

a)

the control variable

b)

the independent variable

c)

the sample variable

d)

dependent variable

52.
The Y axis is labeled with the
a)
control variable
b)
independent variable
c)
sample variable
d)
dependent variable
53.

How do you separate excess insoluble reactant from a solution?

a)

Filtration

b)

Crystalisation

c)

Evaporation

d)

Precipitation

54.

How would you remove water to leave solid salt crystals?

a)

Filter

b)

Distil

c)

Evaporate

d)

Precipitate

55.

What is the test for carbon dioxide gas?

a)

Turning limewater milky

b)

Squeaky pop test

c)

Add litmus paper

d)

Makes a glowing splint relight

56.
This picture represents which of the following?
a)
element
b)
compound
c)
mixture
57.

When an equal strength acid and base are mixed, what kind of chemical reaction occurs?

a)

Neutralization

b)

Combustion

c)

Oxdation

d)

Decomposition

58.

Copper oxide and sulphuric acid react to form which new products?

a)

Copper sulphate + water

b)

Copper chloride + hydrogen

c)

Copper chloride + water

d)

Copper sulphate + water + hydrogen

59.

Which of the following is formed when a carbonate reacts with an acid?

a)

An oxide

b)

Salt + hydrogen

c)

Carbon dioxide + water

d)

Salt + water + carbon dioxide

60.
What does ductile mean?
a)
electricity flows easily
b)
quacks like a duck
c)
can be drawn into a wire
d)
able to bend
61.

Metals are sonorous in nature. What is sonorous?

a)

Making into powder

b)

Drawn into wires

c)

Make sound on beating

d)

None of these

62.
What does malleable mean?
a)
able to bend
b)
will break easily
c)
can be used for wire
d)
is shiny
63.
zinc + hydrochloric acid ---->
a)
zinc chloride
b)
zinc chloride + hydrogen
c)
zinc chloride + oxygen
d)
zinc chlorine + hydrogen
64.
Metalloids _____________
a)
have no properties of metals.
b)
have no properties of nonmetals.
c)
have some properties of both metals and nonmetals.
d)
none of the above
65.

More reactive metal displaces less reactive metal from its salt solution is known as

a)

Combination reaction

b)

Displacement reaction

c)

Neutral reaction

d)

None of the above

66.

Non-metal used in purple colour solutions which is applied on wounds as an antiseptic

a)

Iodine

b)

Oxygen

c)

Sulphur

d)

Phosphorus

67.

Non-metal used in water purification process

a)

Oxygen

b)

Nitrogen

c)

Chlorine

d)

Iodine

68.

Metals react with water to produce

a)

Metal hydroxide

b)

Hydrogen gas

c)

Metal hydroxide and hydrogen gas both

d)

None of the above

69.

Colour of copper sulphate solution is

a)

Green

b)

Blue

c)

Black

d)

White

70.

Zinc is more reactive than

a)

Copper

b)

Iron

c)

Copper and Iron both

d)

Only iron

71.

Sodium is very reactive metal because it reacts vigorously with oxygen and water and

a)

Generate heat

b)

Catches fire

c)

Stored in kerosene

d)

All of the above

72.
What two conditions make iron rust
a)
Water only
b)
air only
c)
water and air
d)
Hydrochloric acid
73.

Metals create _________ ions, because they give away (lose) electrons.

a)

positive

b)

negative

c)

neutral

74.

Choose which one is a physical property

a)

Flammability

b)

Solubility

c)

Water Reaction

d)

Magic

75.

Choose the one that is a chemical property

a)

Magnetism

b)

Size

c)

Color

d)

Reactivity with water

76.

Flammability is the ability of a substance to _________

a)

Burn

b)

Transfer heat

c)

Transfer electricity

d)

Cook

77.

If you describe a substance as being corrosive, you have given a __________ property of that substance

a)

Chemical

b)

Large

c)

Physical

d)

Thermal

78.

Electrical conductivity is an example of what kind of property?

a)

Chemical

b)

Large

c)

Physical

d)

Boiling

79.

Choose the 3 that are physical properties of aluminum foil

a)

Malleable

b)

Luster

c)

Oxidation

d)

High melting point

80.

If you had two different substances that looked exactly the same, which properties would you use to tell them apart?

a)

Sound

b)

Size

c)

Color

d)

Density

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