The activation energy for a reaction can be determined by measuring the reaction rate at different
a. temperatures
b. catalyst concentrations
c reactant concentrations
d times on the reaction curve
the answer is a. explain why. i thought c would be the answer because reaction rate is found by looking at reactant concentrations.

Observation and experimentation have led many scientists to accept a theory about the origin of the universe. this theory is called the big bang theory. scientific evidence collected and observed by scientists around the world suggests that the universe is ever expanding from a hot and dense initial state. what makes this a scientific theory? (2 points)