What do sulfuric acid and nitric acid not have in common?

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?

If 16.00g of hydrogen gas reacts with 126.73g of oxygen, how many grams of water are yielded? (both reactants are completely consumed in the reaction.)

A40 kilogram skier starts at the top of a 12 meter high slope. at the bottom, she is travelling 10 meters per second. how much energy does she lose to friction