Ireally suck at chemistry and need someone to explain how to do this to me, .

Newtons second law deals most cosely with

To find the enthalpy of a reaction in the lab, you measured the of the reactants and the change during the reaction.

What is a substance? a. a physical property of matter b. a chemical property of matter c. an element or compound that cannot be physically separated d. characteristics used to tell the difference between mixtures