8 In Order To Raise The Temperature Of A Cup Of Water By 4 C Approximately 200 Joules Standard Unit Of Heat Must Be 1 (39.51 KiB) Viewed 11 times
8 In Order To Raise The Temperature Of A Cup Of Water By 4 C Approximately 200 Joules Standard Unit Of Heat Must Be 2 (46.56 KiB) Viewed 11 times
8. In order to raise the temperature of a cup of water by 4°C, approximately 200 Joules (standard unit of heat) must be added to the water. If you wanted to increase the temperature of a cup of water by 8°C, how many Joules of energy would you need to add? How did you determine this? 400 Joules of energy would 9. Use algebra to rearrange the equation in #17 so that specific heat is by itself on the left-hand side of the equation. SH= 10. If 4T is measured in °C, m is measured in grams (g), and q is measured in Joules (J), what are the units for specific heat capacity, SH? Hint: use the equation you created in the previous question. 11. Use algebra to rearrange the equation from #9 so that heat is by itself on the left-hand side of the equation. This is the most common way of showing the relationship between heat, mass, change in temperature and specific heat.
12. Use the equation for heat that you derived in #11 to answer the following quantitative problems. a) How many joules of heat energy are needed change the temperature of a 140. gram piece of aluminum from 25.0°C to 33.0°C? The specific heat capacity for aluminum is 1.89 J/gºC and the equation for AT = Innal-initial I b) How many joules of heat energy are needed to change the temperature of 140. grams of water from 25.0°C to 33.0°C? The specific heat capacity of water is 4.184 J/gºC. c) Using the vocabulary from this activity, explain why the same mass of aluminum and water need different amounts of heat to reach the same final temperature.
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