Properties of matter

Question 1

What is the name of the measure of the mean kinetic energy of the particles in a substance?

Answer 1

Temperature

Question 2

What does the specific heat capacity of a substance mean?

Answer 2

The specific heat capacity of a material is

the energy required

to raise one kilogram (kg) of the material

by one degree Celsius (°C).

Question 3

When do you use specific latent heat of fusion

Answer 3

When changing from solid to liquid

Question 4

What is temperature of a substance a measurement of?

Answer 4

The mean kinetic energy of the particles in that substance

Question 5

When do you use latent heat of vaporisation?

Answer 5

When changing from liquid to gas

Question 6

How do you change from degrees C to degrees Kelvin?

Answer 6

Add 273

Question 7

Which unit of temperature do you use in the gas law equations?

Answer 7

Kelvin

Question 8

What is the name for 0 Kelvin?

Answer 8

Absolute zero

Question 9

What is the unit symbol for pressure?

Answer 9

Pa

Pascals

Question 10

What is meant by absolute zero?

Answer 10

0 K

this is the same as -273 degrees C

Question 11

What is the symbol on the formula sheet for heat energy?

Answer 11

Eh

Question 12

What is the symbol on the formula sheet for pressure?

Answer 12

p

small p is pressure
big P is power

Question 13

What is the symbol on the formula sheet for Area?

Answer 13

A

Question 14

What is the symbol on the formula sheet for energy?

Answer 14

E

Question 15

What is the symbol on the formula sheet for temperature?

Answer 15

T

big T is temperature
little t is time

Question 16

What is the symbol on the formula sheet for volume?

Answer 16

V

watch out V is volume and V is voltage so make sure you’re on the right bit of the formula sheet!

Question 17

What is the symbol on the formula sheet for specific heat capacity?

Answer 17

c

Question 18

What is the symbol on the formula sheet for specific latent heat?

Answer 18

l

Question 19

What is the symbol on the formula sheet for mass?

Answer 19

m

Question 20

What does ΔT mean on the formula sheet

Answer 20

change in temperature

it doesn’t matter whether you use degree C or Kelvin for this the answer will be the same

Question 21

What units should you use for temperature for these Gas Laws?
(p1/T1=p2/T2, V1/T1=V2/T2,
pV/T=constant)

Answer 21

Kelvin

Question 22

Explain
in terms of the kinetic model
what happens to pressure when
volume decreases

Answer 22

• Volume decreases
• So particles collide with the walls more frequently
• So force on the walls is greater
• So pressure increases (because P=F/A)

Question 23

Explain
in terms of the kinetic model
what happens to pressure when
temperature decreases

Answer 23

• Temperature decreases
• so kinetic energy of the particles decreases
• so particles hit the walls less frequently
• so particles hit the walls with less force
• so pressure decreases

Question 24

Explain
in terms of the kinetic model
what happens to pressure when
volume increases

Answer 24

• Volume increases
• So particles collide with the walls less frequently
• So force on the walls is lower
• So pressure decreases (because P=F/A)

Question 25

Explain in terms of the kinetic model what happens to **pressure** when **temperature increases**

Answer 25

* Temperature **increases** * so *kinetic energy* of the particles *increases* * so particles hit the walls *more frequently* * so particles hit the walls with *more force* * so pressure **increases**