U10 Thermochemistry pg1-3

​4.15 J

​4.18 J

1 cal

0.99 cal

Open Ended

Summary Question #3

If both the pitcher of lemonade and the metal of the chair are absorbing energy from the sun, why does one feel cool 

    and one feel hot? (record this response in your summary)

Multiple Choice

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

• low; less energy
• high; less energy

• low; more energy

• high; more energy

Open Ended

Why is space so cold?

Multiple Choice

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

• 125,400 J

• 104,500 J

• 209,000 J

• 62,700 J

Multiple Choice

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

• 16,875 J

• 12,975 J

• - 16,875 J

• - 12,975 J

Multiple Choice

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

• 2,100 J

• 6,150 J

• 5,250 J

• 3,150 J

Multiple Choice

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

• 35,350 J

• 25,250 J

• 10,100 J

• 15,150 J

Multiple Choice

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

• 121,600 J

  absorbed

• 121,600 J

  released

• 125,350 J

  absorbed

• 125,350 J

  released

Multiple Choice

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

• Copper

• Liquid Water

• Iron

• Basalt

Multiple Choice

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

• Endothermic

• Exothermic

Multiple Choice

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

• Endothermic

• Exothermic

Multiple Choice

9. Why does heat not travel in space?

• Because space is too cold to transfer heat

• Because there are no particles in space to transfer heat

• Because heat can only move through water and air

• Because the Sun absorbs all the heat in space

Multiple Choice

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?

• 0.39 J/g°C, Copper

• 0.45 J/g°C, Iron

• 0.84 J/g°C, Basalt

• 0.13 J/g°C, Lead