What do you call a tree without any leaves?

Treeves

Calcium hydride (cah2) reacts with water to form hydrogen gas: cah2(s) + 2h2o(l) → ca(oh)2(aq) + 2h2(g) how many grams of cah2 are needed to generate 45.0 l of h2 gas at a pressure of 0.995 atm and a temperature of 32 °c?

Name the intersection of plane bpq and plane cpq.

Chemistry worksheet - i am not sure what they are asking for exactly?