Which statement about activation energy is true? a. it is not affected by catalysts. b. it has no effect on the rate of the reaction. c. it is the energy required to break existing chemical bonds. d. it is the same for all reactants.

Determine the maximum r-value of the polar equation r =3+3 cos 0

What happens when a rubber rod is rubbed with a piece of fur?

Which of the following is a direct benefit of the use of assembly lines in production a. laws against theft fraud and coercion are needed to protect free choice. b. the government needs to plan efficient outcomes. c. competition among producers by itself cannot ensure a wide range of consumer choices. d. works pressure the government to guarantee minimum wages