Which of the following describes a scientific process? a) jon claims that cities are better than towns. he finds 12 people who agree with him as evidence to support his claim. b) kyra starts to believe in vampires after she sees a movie that has vampires in it. c) pedro plants a sapling in his front yard. he observes and measures it each day. using his observations, he hypothesizes that the leaves grow most in the spring. d) justine drinks eight glasses of water every day because she saw a presentation in health class about water being good for you.

C) Pedro plants a sapling in his front yard. He observes and measures it each day. Using his observations, he hypothesizes that the leaves grow most in the spring.

Why?

The other ones have no experiment or hypothesis, science is about doing things and getting your hands dirty, not hearing something then believing it.

c. is the correct answer

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.