What is an electron?

What is a proton?

An atoms mass number equals the number of

Two different isotopes of an element have different

An atoms atomic number is equal to

A chemical equation is balanced by changing or adding

What is the relationship between chemical equilibrium and the rates of forward and reverse reaction?

Which of the following occurs in an endothermic reaction but not in an exothermic reaction?

The substance that is formed in a chemical reaction is called the

Which is not true of enzymes?

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