Answers to Worksheet on Unit 11

Apologies for not giving the answers earlier.

1a   2.5°C

1b   1040 J

2a   900 J / K

2b   7200 J

2c   1800 J / K

2d   No. More mass, more heat capacity (more ability to store heat before changing temperature)

3   4000 J / K

4a   900 J / (kg K)

4bi   3600 J

4bii   4000 J

5a   55°C

5b   12 min

5c   Not all energy supplied to the water is absorbed by water, some energy is lost to the surroundings as heat.

6   K. Temperature change for K is higher, meaning that K is unable to hold that much heat before rising in temperature, thus specific heat capacity of K is lower.

7a   0.25 kg

7b   130 000 J

7c   35 J / kg

8a    2 100 000 J

8b   22 600 000 J

8c   400 000 J

9   1.21 kg

10a   36 000 J

10b   15.6°C

If there are any questions relating to the above answers, please do message me. Thanks.