Which statement describes a chemical reaction?
Atoms in the products are rearranged to form new substances.
Atoms in the reactants are rearranged to form new substances.
Atoms in the products change into new atoms to form new substances.
Atoms in the reactants change into new atoms to form new substances.

Which statement is usually true about the relationship between activation energy and reaction rates? low activation energy barriers result in low rates. high activation energy barriers result in low rates. low activation energy barriers result in no reaction. high activation energy barriers result in no reaction.

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.

How many moles of oxygen react with 12 moles of aluminum