Pre-AP Day 82

Now that we understand how energy is transferred between objects and we can calculate that energy using specific heat, we will extend this to calorimetry problems.  In addition, today we introduce the concept of enthalpy.


1. Which way does energy always flow between a hot object and a cold one?  How does the final temperature compare to that of the starting hot object and cold object?

2. A rock is 10°C when the sun rises and reaches 45°C by 2pm.  If the specific heat of the rock is 0.365 J/g°C, and it has a mass of 6.55 kg, how much energy was absorbed by the rock in this time?


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