Chemical Reactions Review

A number in a chemical formula that tells the number of atoms in a molecule or compound.

An uncombined element replaces an element that is part of a compound.

Energy is absorbed into a substance.

A complex substance breaks down into two or more simpler substances.

Two or more simple substances combine to forma a new, more complex substance.

A combination of symbols that shows the ratio of elements in a compound.

What is a molecule?

What is a solid that is formed from a mixture of two liquids?

In the equation 2Na + Cl₂ --> 2NaCl, what is the product?

A substance that enters into a chemical reaction.

A substance formed as a result of a chemical reaction.

Energy is released from a substance.

A compost pile releases heat due to chemical reactions involving nitrogen. These reactions are:

Different atoms in different compounds replace each other.

What is a change in matter that we look for in a chemical reaction?

When there are two or more products in a chemical reaction they are separated by what?

Which law states the amount of matter involved in a chemical reaction does not change?

A change in matter that produces one or more new substances.

A number placed in front of a chemical formula in a chemical equation.

What is an element?