Topic 3

Question 1

What is the name for the process of a substance changing from a solid to a liquid?

Answer 1

Melting

Question 2

What is the name for the process of a substance changing from a liquid to a gas?

Answer 2

Evaporation

Question 3

What is the name for the process of a substance changing from a gas to a liquid?

Answer 3

Condensation

Question 4

What is the name for the process of a substance changing from a solid to a gas?

Answer 4

Sublimination

Question 5

Is a change of state a physical or a chemical process?

Answer 5

Physical

Question 6

What is the definition of internal energy?

Answer 6

Total kinetic + potential energy

Question 7

How does the heating of a substance affect its internal energy?

Answer 7

Heating increases the kinetic energy of particles leading to an increase in internal energy

Question 8

What is the definition of specific heat capacity?

Answer 8

How easy it is to heat up a substance

Question 9

What is the definition of latent heat?

Answer 9

The amount of energy needed for a substance to change state

Question 10

How do you describe the motion of gas molecules?

Answer 10

• random directions
• range of speeds

Question 11

How do you calculate the density of a rock?

Answer 11

• fill a displacement can up to the bottom of the spout
• place the object in the can
• Collect the water that comes out the spout
• Measure the volume of the water collected
• measure. The mass of the object.
• Mass / volume = pressure

Question 12

What causes an increase in pressure (3)?

Answer 12

• a reduction in volume
• an increase in mass ( a greater number of particle)
• a higher temperature

Question 13

What happens to the temperature of a substance when it changes state?

Answer 13

It remains constant