What is an extinction event

What is the rate law for the uncatalyzed reaction?

Which best describes the activation energy of a chemical reaction? a. the combined energy of all the reactants b. the amount of energy required for a reaction to occur c. the difference in energy between products and reactants d. the potential energy stored in the bonds of reactants and products

How much mass would a mole of hydrogen molecules contain? recall that hydrogen is diatomic. g/mol