Practice exam questions- Chemistry

Question 1

Write the name of the state of matter that has: particles that are spread out the most?

Answer 1

Gas

Question 2

Write the name of the state of matter that has: Particles that are NOT free to move.

Answer 2

Solid

Question 3

Write the name of the state of matter that has: Particles that move through the whole of their container.

Answer 3

Gas

Question 4

Fill in the sentences:
The change of a substance from a liquid to a solid is called ______

Answer 4

Freezing

Question 5

Fill in the sentences:
The change of a substance from a liquid to a gas is called ______

Answer 5

Evaporation

Question 6

Fill in the sentences:
The change of a substance from a solid to a liquid is called ______

Answer 6

Melting

Question 7

Fill in the sentences:
When a solid melts, the surroundings transfer energy to the solid so it’s particles vibrate _____

Answer 7

Faster

Question 8

Fill in the sentences:
When a liquid freezes, it’s particles move more ______ as they transfer energy to the surroundings.

Answer 8

Slowly

Question 9

Fill in the sentences:
In liquids and gases, particles spread out through the process of ______.

Answer 9

Diffusion

Question 10

What does a thermometer measure?

Answer 10

Measures the temperature of the air.

Question 11

What does a stop watch measure?

Answer 11

Measures the time for the experiment.

Question 12

What do weighing scales measure?

Answer 12

Measure the mass of something.

Question 13

What does a ruler measure?

Answer 13

Measures the length of a plant.

Question 14

In what unit would a stop clock measure?

Answer 14

Seconds, minutes or days.

Question 15

In what unit would a thermometer measure?

Answer 15

Degrees Celsius or Fahrenheit.

Question 16

In what unit would a ruler measure?

Answer 16

Mm or cm

Question 17

In what unit would a weighing scale measure?

Answer 17

Grams (g)

Question 18

What is gallium’s melting point?

Answer 18

30 degrees C

Question 19

What is gold’s melting point?

Answer 19

1063 degrees C

Question 20

What is oxygen’s melting point?

Answer 20

-218 degrees C

Question 21

What is water’s melting point?

Answer 21

0 degrees C

Question 22

Name the state of matter that diffusion happens the fastest in.

Answer 22

Gas

Question 23

Describe what happens during the process of dissolving. 2 marks

Answer 23

The particles can move freely therefore the particles of the solute diffuse and make a solution with the solvent.

Question 24

Suggest what happens to the rate of dissolving at low temperatures. 1 mark

Answer 24

It will happen slower because there will be less energy in the particles.

Question 25

Give an example of an independent variable.

Answer 25

Mass of salt dissolved in water.

Question 26

Give an example of a dependant variable.

Answer 26

The boiling point of a salt solution.

Question 27

Give the definition of an independent variable.

Answer 27

In an experiment, the independent variable is the thing that is changed or is measured.