1. Last time: steam is boiled water. It is not the same as water vapor, which is water dissolved in air. This is not pure steam. Pure steam is clear (transparent.) There may be some steam here, but mostly it is water droplets in air.

2. 2 kg ice 0°C 0.2 kg water 10°C After reaching thermal equilibrium, about how much water on the right side has frozen? A] zero B] a very small amount, >0 C] about 1/10 of it D] all of it

3. The problem we began on Friday: 2 kg ice -80 °C 1 kg water 10°C

4. What can we conclude from the calculation of the latent heat for freezing all the water? A] All the water will freeze B] Not all the water will freeze C] We can conclude neither

5. Two square (in cross-section) glass rods connect very large copper blocks held at different temperatures. Which rod conducts heat faster? A] Rod A B] Rod B C] They conduct heat at the same rate