1. What holds atoms together when they are a part of a molecule?

Which statement describes both homogeneous mixtures and heterogeneous mixtures?

You encounter a solution that is acidic and you decide to test it by adding a small amount of a strong acid. the ph lowers slightly but is approximately unchanged, and still remains acidic. what can you say about the solution? a. it is a buffer solution. b. it is not a buffer solution it is a strong acid solution. d. the solution has been neutralized. e. the solution has excess acid present

Mary is conducting an experiment on how pollution affects plant growth. how can she ensure that her data are reliable?