Chap 10. Thermal properties of matter

Question 1

Thermal expansion-

Answer 1

solids, liquids, and gases expand when their temperature rises

Question 2

what is the order of most expansion (from least to most)?

Answer 2

solids
liquids
gases

Question 3

What happens when a material expands?

Answer 3

The particles have more energy, move around more, and take up more space.

Question 4

what is internal energy made up of?

Answer 4

kinetic energy of particles and chemical potential energy of the attractive forces between them

Question 5

Specific heat capacity of water:

Answer 5

It takes 4200J to raise the temperature of 1kg of water by 1 C
AKA: the specific heat capacity of water is 4200J/kgC

Question 6

What is specific heat capacity-

Answer 6

the energy needed to raise the temperature of 1kg of the substance by 1 C

Question 7

specific heat capacity equation:

Answer 7

c = energy required/mass x temperature increase

Question 8

How is power related to heat energy (Q)?

Answer 8

Q = Pt (heat energy = power x time)

Question 9

When does the temperature stay the same when states are changing?

Answer 9

When ice is melting, and when water is boiling.

Question 10

Why does temperature stay the same during certain state changes?

Answer 10

energy is absorbed and used to weaken attractive forces instead of increasing kinetic energy (temperature).

Question 11

explain evaporation in terms of the kinetic particle theory?

Answer 11

Particles on the surface of a liquid that are moving faster than the others escape and become particles of vapour.

Question 12

What are the 3 main ways to speed up evaporation

Answer 12

Increasing temperature, increasing surface area, blowing air across surface