Why do people act like they are your friends, then talk and whisper behind your back to another?

it's just the way of people, of course there are some that don't but a lot of us have a tendency to want to fit in. If there with a group of friends that don't like you most people will talk behind your back to fit in with that group. Either that or their just fake and simply never liked you to begin with

answer: a chemical reaction

explanation:

im not wrong

because u need two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei to form isotopes.

so since they all have the same shape? i mean maybe because m& m and reeses are both chocolates