A(n)_ contains two or more substances that are not chemically combined. (pic down below)​

1. list three scientific reasons cockroaches may fly.

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?

Drug abuse will not lead to physical and psychological dependence. true or false ?