Heating substances in the sun: The following table shows the temperature after 10.0 grams of four different substances have been in direct sunlight for up to 60 minutes.

time (minutes)	air (C)	water (C)	sand (C)	metal (C)
0	25C	25C	25C	25C
15.0	28.9C	26.2C	30C	35C
30	32.5C	27.5C	35C	45C
45	36.2C	28.8C	40C	55C
60	40C	30C	45C	65C

PART I: Experiment

2. Order the substances based on the time required to heat them from : slowest fastest 3. Which do you think will cool the fastest? Explain

4. When you boil water in a pot on the stove, which heats faster, the metal or the water? Explain. 5. Why do you think different substances heat up and cool down at different rates? 6. Based on the definition above, which of the 4 substances do you think has: a) the highest specific heat capacity? b) the lowest heat capacity? 7. Here are the heat capacities of the four substances: 4.18 J/g c, 1.00 J/g c, 0.80 J/g c, and 0.60 J/g c. Match and then label each substance with its specific heat capacity on the graph.

8. If something has a high specific heat capacity will it take a lot of heat or a little heat to change its temperature? Explain. (careful! Use the definition, your graph, and the data from #6) 9. Assuming they both start at the same temperature, which will heat up faster, a swimming pool or a bath tub? Explain your thinking. PART II Calculation: 10. For q= m c T : identify each variables by name & the units associated with it. 11.Heat is not the same as temperature, yet they are related. Explain how they differ from each other. Solve the following problems using: Q= C M T ; where T =Tf - Ti 12. Gold has a specific heat of 0.129 J/(gC). How many joules of heat energy are required to raise the temperature of 50 grams of gold from 20 C to 25 C? 13. An unknown substance with a mass of 200 grams absorbs 1200 J while undergoing a temperature increase of 12C. What is the specific heat of the substance? 14. If the temperature of 42.5 g of ethanol increases from 20 C to 80.6 C, how much heat has been absorbed by the ethanol? The specific heat of ethanol is 2.44 J/(gC). 15. If 450 g of water at 55 C loses 8840 J of heat, what is the final temperature of the water? Liquid water has a specific heat of 4.18 J/(gC).