Which of these statements about reaction rates is accurate?

(a) all chemical reactions occur at different rates.
(b) all chemical reactions occur at the same time.
(c) all chemical reactions occur at a slow rate.
(d)all chemical reactions occur at a fast rate.

The footprints of a dinosaur and the burrow of an ancient shrimp are examples of which kind of fossils

Which of the following warnings would an agricultural chemist tell a farmer who wants to recycle his or her own ammonia? recycling ammonia is a difficult process that sometimes takes weeks. recycling ammonia requires a degree in biochemistry or a related field. recycling ammonia can be harmful because it is highly flammable and toxic. recycling ammonia costs too much money considering the price of the necessary chemicals.

Kelly has come up with an explanation for why her sister is sometimes in a good mood and other times in a bad mood. she speculates that it is based on the hours of sleep her sister got the previous night. this explanation for her sister's behaviors is an example of a(n)