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Heat and Temperature Review

1. Internal energy and temperatuer are directly related.  If the temperature of an object increases then the internal energy will also increase (vice/versa).

2. The two object must be at the same temperature.

3.  The two objects will not transfer heat because they are at equilibrium.  The object with more mass has more particles and therefore more internal energy.

4. The temperature of the water will decrease because some heat will be transferred into the thermometer.  Thermometers are generally made of substance that do no absorb heat very well (like glass).

5.  Make sure you know the equations for converting temperature into different units. 

6. 35C.  A greater temperature change will require more energy.

7. Zero net heat transferred if the objects are in equilibrium.

8.  Kinetic energy increases, so temperature and internal energy will increase.

9.  Stirring increases the area of the coffee exposed to cooler air.

10. Conservation of Energy

11. Air becomes trapped between the layers.

12. Metals are dense, therefore particles collide more making it easier to conduct heat.

13. 40 C 

14. Empty space does allow particles to collide and therefore transfer heat.

15. Less dense.  Less particle collision for heat to be transferred.

16. Water has a very high specific heat capacity.  It will take a lot of energy to raise the temperature of a large body of water.

17. Qwater = -Qzinc  (Hint:  Heat will be transferred until the objects are in thermal equilibrium.  The final temperature of water is also the final temperature of the zinc)  C = 382 J/Kg*C

18. The heat absorbed by the water is equal to the heat released by the nut.  Find the amount of energy the water absorbed (Qw =5567.38 J) .  This is 25 % of the energy released by the nut.  Find the total amount of energy released by the nut ( Qnut = -22269.5 J).  Convert into Calories (5.32 Cal).  Divide by the change in mass of the nut (14.41 Cal/1gram).

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