How do you convert 3.00 x 10^8 meters/second to miles per hour? confused about the 10^8

Which statement is true about a catalyst? a: a catalyst decreases the rate of the reaction. b. a catalyst is consumed during a chemical reaction. c. a catalyst lowers the activation energy of a reaction. d. a catalyst increases the reactant concentration during a reaction.

At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver

Astudent conducts an experiment to determine how the amount of water given to a plant affects its growth. what is the independent variable for this experiment?