Week 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

The total kinetic and potential energy of all particles in a system

Question 7

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

Answer 7

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

Question 8

What is the definition of specific heat capacity?

Answer 8

The amount of energy required to raise the temperature of 1 kg of a substance by 1°

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 does an increase in temperature affect the pressure?

Answer 11

An increase in temperature leads to an increase in the kinetic energy of the particles meaning the part particles move faster and collide more often. An increase in the number of collisions leads to an increase in pressure.

Question 12

How do you calculate the density of an object?

Answer 12

• 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