What is the name of the orange metal visible after one week from iron + copper sulphate

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?

How many moles of magnesium is 3.01 x10^22 atoms of magnesium?

Which are forms of frozen water? check all that apply. dew frost hail rain sleet