ICA- Specific Heat Capacity



ICA- Specific Heat Capacity

Name:____________________________

Class:_______________

Outcomes Assessed:

/4: 308-7- demonstrate and compare qualitatively, the heat capacities and heat absorption of common materials by investigating and evaluating how the surfaces absorb heat.

Using a calculator and your notes provided, answer the following questions:

1) Look at the definition of heat capacity and SPECIFIC heat capacity in the reading provided earlier.

a) What is the difference between these terms?

b) Which characteristic (Heat Capacity or Specific Heat Capacity) is more useful for comparing different materials? Explain why.

2) The specific heat capacity tells you the amount of thermal energy needed to warm 1g of material by 1ºC. Suppose that you want to heat a mug of hot chocolate (125g in total) from room temperature (20 ºC) to 44 ºC. This is a temperature change of 24 ºC. Use the following steps to find the energy (J) needed.

a) Hot chocolate is mostly water. The specific heat capacity is 4.19J/g ºC. Multiply the specific heat capacity by 24 ºC to find out how much energy is needed to warm 1g of water 24 ºC.

b) Multiply your answer in part (a) by 125g to find the amount of energy need to warm all 125g of hot chocolate to the proper temperature.

3) Use the procedure in question 2 to find:

a) The amount of energy needed to warm 250g of concrete by 15 ºC. (Specific heat of concrete=3.00J/g ºC)

b) The amount of energy needed to warm 1kg (1000g) of brass from 25 ºC to 55 ºC.

(Specific Heat of Brass= 0.38J/g ºC)

3) The specific heat capacity of Aluminum is 0.92J/g ºC and Steel is 0.44J/g ºC. Suppose that an aluminum frying pan and a steel frying pan of equal mass are heated identically on a stove.

a) Which pan will reach cooking temperature first?

b) Which pan will be more likely to burn food if it is heated too long?

c) After the stove is turned off, which pan will be cool enough to wash first?

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