1. Heat & The Gas Laws S4 Physics - 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1516 17 18 19 20

2. 1. What is the difference between Heat and Temperature?
answer
Heat is a form of energy, temperature is a measure of how hot or cold something is.

3. 2. Heat is measured in ….
answer
Joules

4. 3. Temperature can be measured in ……….
answer
Celcius (ºC)
Kelvin (K)

5. 4. How can heat loss from the home be reduced?
answer
Insulation
location
Type of heat loss
Loft insulation
Roof space
convection
Cavity wall
Between walls
conduction
Silver foil
Behind walls, radiators
radiation
Insulation
location
Type of heat loss
Roof space
convection
Cavity wall
conduction
Silver foil
Behind walls, radiators

6. 5. What is meant by the term specific heat capacity?
answer
The amount of heat energy required to change the temperature of 1kg of a substance by 1ºC.

7. 6. What does the symbol ∆ stand for in the equation Eh = cm∆T?
answer
“Change in” (temperature).

8. 7. What does the term “specific latent heat of fusion” mean.
answer
The amount of heat energy required to change 1kg of a substance from solid to liquid

9. 8. How much heat energy is needed to heat 2kg of water from 20ºC to boiling point? (c = 4180 J/kg ºC)
answer
Eh = cm∆T
= 4180 X 2 X 80
=668800J

10. A force that acts on an area.
9. What is a pressure?
answer
A force that acts on an area.

11. What are the units of pressure?
answer
Pascals (Pa) or N/m2

12. 11. How many cm2 are there in 1m2
answer
10,000 (100 x 100)

13. 12. What causes gas pressure?
answer
The particles colliding with the walls of the container

14. 13. What is meant by the term “Kinetic Theory”.
answer
The theory that gases are made of particles that are moving randomly in all directions

15. Pressure increases as volume decreases.
14. What happens to the pressure in a syringe when you push the plunger in?
answer
Pressure increases as volume decreases.

16. Pressure increases as temperature increases
15. What happens to pressure in a aerosol can when it is thrown on a bonfire.
answer
Pressure increases as temperature increases

17. 16. What temperature in ºC is absolute zero?
answer
-273 ºC

18. 17. What is 20 ºC in Kelvin?
answer
293K

19. 18. What happens to the pressure in a car tyre after a motorway drive?
answer
Pressure increases as temperature has increased

20. 19. What is pressure measured with?
answer
A pressure gauge or Bourdon Gauge

21. 20. What is the combined gas law equation?
answer