How do I know which substance is being reduced?

Which of these expressions are correct variations of the combined gas law? p1v1t2 = p2v2t1 both

Which statements are true concerning mineral formation? check all that apply. the slower the cooling, the larger the crystals. the faster the cooling, the smaller the crystals. crystals formed from magma are smaller than crystals formed from lava. minerals can only form in solutions when the solution is heated deep underground. when a solution cools, elements and compounds leave the solution and crystallize as minerals. minerals formed from hot water solutions can form narrow channels in the surrounding rock.

Areaction is first order with respect to reactant x and second order with respect to reactant y. which statement describes the rate law for this reaction?