What are the signs that you have chemistry with a guy?

Good chemistry doesn't always mean great conversation. If I just feel comfortable with a girl and vice-versa, that's chemistry.

As far as questions, talk to him about anything that interests you or him, and it doesn't even have to be important.

The best bet for knowing if you have true chemistry is a feeling that no matter what you do or say as long as you are being yourself the person you are with will not judge you based on your mistakes. Of course each of you are going to make opinions of each other, but you shouldn't feel like your constantly under the gun, its not healthy and turns out to make a bad relationship in the end.

be yourself around him and smile, see how he reacts, how he acts around you will show if you will work well together. If he is tense and bottled up all the time it means he is afraid to be himself around you so be open with him and hopefully he will become himself with you!

Good chemistry to me is feeling comfortable around a person both physically and personality-wise!! And for you to be comfortable they have to feel comfortable around you as well!! As well as the fact that you both need to be relatively attracted both physically and mentally to each other!! This will create a calm feeling and make you more relaxed and open around that person and thus you have chemistry with them!!