10 minutes maximum! Can you do it in 5?

1. Which of these sentences best describes the specific heat capacity (c) of a substance?

• A. The energy needed to raise the temperature of a substance by 1 oC.
• B. The energy needed to raise the temperature of 1 kg of a substance by 1 oC.
• C. The temperature reached when 1 kg of a substance is heated by 1 joule.
• D. The temperature reached when a substance is heated by 1 joule.

2. Which of the following correctly gives the formula for S.H.C. in terms of the heat energy ΔQ supplied to a substance?

• A. ΔQ = m . c . ΔT
• B. ΔT = m . c . ΔQ
• C. ΔQ = c . ΔT
• D. ΔT = ΔQ . c

3+4. The image shows a large glass vase holding 2 kg of cold water.

Water has a specific heat capacity (c) of 4200 J / Kg 0C.

3. The energy needed to heat 2 kg of water by 5 0C is ..

• A. 4200 J
• B. 8400 J
• C. 42000 J
• D. 84000 J

3. If I supply 210 kJ of heat to the same 2 kg of water, how much would the temperature increase?

• A. 25 0C
• B. 50 0C
• C. 100 0C
• D. 250 0C

Q 5-7. These questions are about heating different bars of copper.

Copper has a specific heat capacity of 800 J / Kg 0C.

What are the missing values?

 Energy Supplied Mass (kg) Temperature Increase (0C) 5. ? 200 J 16 kJ 160 kJ 400 kJ 20 10 6. 8000 J ? 4 10 2 0.5 20 7. 400 kJ 5 ? 4 100 20 200

8. The diagram shows a standard method of finding the S.H.C. of aluminium.

The block has a mass of exactly 1 kg.

What additional measurements are required to find the S.H.C. of aluminium?

 I. The temperature rise II. The time taken to reach the higher temperature III. The energy supplied to the heating element

• A. I and II
• B. I and III
• C. II and III
• D. All of them

9+10. These ice cubes have a total mass of 100g. The specific heat capacity of ice is about half that of water.

9. A student heats these ice cubes and also 200 g of water by 10 oC each. They then compare how much heat energy is needed to do this.

Which of these statements is correct?

Howard wang86 wikimedia commons
• A. The ice will need ¼ the energy to heat compared to the water.
• B. The ice will need ½ the energy to heat compared to the water.
• C. The ice will need the same energy to heat as the water.
• D. The ice will need 4 times the energy to heat compared to the water.

10. In this example, the formula for specific heat capacity can be used when the ice is...

• A. solid ice or melting
• B. evaporating
• C. heated but staying in the same state
• D. staying at the same temperature