A, O2 has to be a reactant for combustion to burn
Shale actually forms in the part of the rock cycle called compaction.
<span>The copper would go under oxidation since it will be losing two electrons. Copper starts out with an oxidation number of zero, but in order to balance the compound of CuO with the Oxygen having an oxidation number of -2, a positive 2 is required</span>
Gold is one of the softest metals. So YES
