What 2 substances add together to make hydrogen gas?
Answer:
Zn +2 HCl >> ZnCl2 + H2
CaH2 + 2 H2O >> Ca(OH)2 + H2
C(s) + H2O (g) >> CO (g) + H2
CO (g) + H2O ( g) >> CO2 (g) + H2(g)
hydrogen forms a molecule composed of two atoms of hydrogen
Hydrogen is an element. It is not composed of other substances. It can be PRODUCED in a chemical reaction by combining substances, but hydrogen is composed of nothing but hydrogen.
Two hydrogen molecules.
Hydrogen gas is just two Hydrogen molecules bonded together.
acid + metal --> salt + hydrogen
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