What are the features of alkali metals?

a. non-metallic, hard, high density, unreactive
c. metallic, hard, high density, medium reactivity
b. metallic, soft, low density, highly reactive
d. non-metallic, medium hardness, high density, inert

How is electrolysis most commonly used to produce an energy source? a - splitting water molecules produces oxygen, which organisms breathe to fuel their bodies. b - splitting water molecules produces hydrogen gas, which is used to power machines through hydrogen fuel cells. c - splitting carbon dioxide molecules produces coal, a form of carbon that can be burned to produce heat. d - splitting carbon dioxide molecules produces natural gas, which can be burned to generate electricity in power plants.