U10 Thermochemistry pg1-3

Insulators have specific heats that are ________ because they require ________ to heat up.

1. How much heat is required to raise the temperature of 500 g of liquid water from 20°C to 80°C?

2. A 250 g sample of iron is heated from 30°C to 180°C. How much heat energy is required?

3. A 200 g sample of solid water (ice) is cooled from -5°C to -20°C. How much heat is removed?

4. How much heat is needed to raise the temperature of 1000 g of dry air from 10°C to 35°C?

5. Calculate the heat energy when a copper pot weighing 2,500 g is heated from 22°C to 150°C.

6. Which substance from the list would make the best conductor according to the specific heat chart?

7. If the temperature of water changes from 80°C to 50°C, will the transfer of heat be endothermic or exothermic?

8. If the temperature of water changes from 80°C to 95°C, will the transfer of heat be endothermic or exothermic?

9. Why does heat not travel in space?

K ONLY:

10. A 50 g sample of an unknown metal absorbs 563 J of heat, raising its temperature from 25°C to 50°C. What is the specific heat of the metal, and what is the most likely substance?