Predict the product in the combination reaction below.

Al (s) + N2 (g) →

A__ is two or more substances that are together in the same place but are not chemically combined

Classify each statement about effective nuclear charge, zeff, as true or false.

Arock can be broken down into different kinds of substances by physical processes. no chemical reactions are needed to separate different parts of a rock into pure substances. this is because a rock is a(n)