The number of molecules of a substance involved in a reaction is indicated by the

The total mass of the reactant equal the total mass of the products is the

What does the arrow in a chemical reaction mean?

The new substances produced by a reaction are the _______?

What principle/law states that every chemical reaction causes a decrease in usable energy and an increase in entropy?

A chemical reaction that releases thermal energy is a ______ reaction.

Entropy means _____.

In thermodynamics, the part of the universe being studied is called the _____.

A chemical reaction that has the same number of each type of atom on each side of the arrow is said to be ______.

If a chemical reaction can occur by itself, without continuing outside help is it called ______.

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