The idiomatic expression "my/your/his/her chemistry" refers to a person’s natural compatibility with another, often in terms of romantic relationships. Full definition
You can be anonymous at the beginning and after your test of chemistry of relationship you can be indicated or choose to remain anonymous. (adultfindout.com)
A: As with any change in chemistry of your aquarium water, we always recommend small changes as to not cause harm to the animals. (bluelifeusa.com)
The primary focus for example, would be understanding chemical change e.g. reversible and non reversible reactions in chemistry with a secondary focus as planning within the scientific method. (empiribox.org)