1. Where does the heat used to re-inflate a balloon come from? 2.When a cup of hot coffee cools down, where does the heat go?

3. How can you keep a cup of coffee warm?

Aballoon inflated with three breaths of air has a volume of 1.7 l. at the same temperature and pressure, what is the volume of the balloon if five more same-sized breaths are added to the balloon?

Select the most likely product for this reaction: koh(aq) + co2(g) – ? k2co3(aq) + h2o(1) k(s) + h2(g) + o2(g) k(s) + co3(9) +h2

The same side of the moon always faces earth because the