changes of state

Question 1

Solid to gas

Answer 1

• sublimation

Question 2

Gas to solid

Answer 2

• deposition

Question 3

Solids

Answer 3

• tightly packed
• fixed position
• vibrate about fixed positions

Question 4

Liquids

Answer 4

• tightly packed

- can slide over each other

Question 5

Gases

Answer 5

• very spread out

- moves with rapid and random motion

Question 6

Practical: temperature time graph

Answer 6

1. Fill beaker with crushed ice. Use a thermometer to monitor temperature
2. Heat with a bunsen burner
3. Using stopwatch, record TEMP and STATE every 30seconds
4. Continue until water has been boiling for a minute
5. Plot graph of temp against time.
   → constant temperature should be seen when ice melting, water boiling.

Question 7

Investigate SHC of materials

Answer 7

1. Place beaker on digital balance and set to 0
2. Add 250ml water and record mass of water using digital balance
3. Put immersion heater and thermometer in water
4. Connect circuit with:
   → ammeter in series with power supply and immersion heater
   → voltmeter in parallel with immersion heater
5. Record initial temperature at 0s
6. Turn on power supply, set at 10V and start stopwatch
7. Record voltage and current
8. Continue to record V and C every 60 seconds for 10 minutes
9. Calc E supplied and temperature change