Core Practical 13: Specific Latent Heat

Question 1

CP13 Equipment List

Answer 1

• Funnels
• Clamp stands
• 300g of crushed ice and spoon
• Beakers
• Thermometer
• Balances

Question 2

CP13 Method

Answer 2

1. Place ice in funnel and allow ice to warm up to 0°
2. Determine mass of empty and dry beaker
3. Put approximately 100cm³ of water in beaker and determine mass of beaker with water. Measure temp of water
4. Add 20g of ice at 0°. Stir till ice melts
5. Record lowest temp reached by ice and water mixture. Occurs when all ice melts
6. Determine mass of the beaker; plus ice and water

Question 3

CP13 Eval

Answer 3

Zero error
- Ensure mass balance is 0 when empty
spillages
- Wipe up any spillages

Question 4

Why do you need to crush ice in funnel?

Answer 4

So water escapes the funnel; only crushed ice will be put into water

Question 5

Assess use of temperature sensor and data logger over thermometer.

Answer 5

• Prevents parallax error in measuring temp
• Dataloggers more useful when data varies over a short period of time
• Dataloggers useful when a number of quantities are being measure simultaneously
• Takes longer for thermometer to respond than sensors