Which one is not a sedimentery rock a.)sandstone b.)limestone c.)quartz d.(coal

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?

Stage in which a star’s outer layers have started to cool and grow outward?

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?