true or false in a chemical reaction the same number of each type of atom will always be present before and after the reaction takes place

How do the energy differences between the higher energy levels of an atom compare with the energy difference between the lower energy level of the atom

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

Which suspect most likely committed the robbery and how do you know