1.) Molecules involved in a chemical reaction must collide to react. What is this concept called?.
a. collision theory
b. entropy. .
c. enthalpy. .
d. reaction rate. .

2.) Which of the following equations is used to describe reaction rates?.
a. ∆H T∆S. .
b. ∆[reactant or product]/∆time
c. Sproducts Sreactants. .
d. pV = nRT.