Unit 1 Matter and Chemical Reactions

_______ are columns. The group number is at the top of the column.

_______ are rows. The period number is to the left of the entire row.

Which set of properties describe this part of the periodic table.

An __________ is a substance that cannot be broken down. It is represented by a __________ symbol.

A __________ is two or more elements chemically combined. (Hint: You will see two different symbols.)

_________ changes will change the material's appearance but do not break chemical bonds between atoms.

In a chemical change, the bonds between valence electrons will break and the atoms are free to reattach to form a ______.

__________ are the beginning substances that are combined and changed in a chemical equation.

________ are the substances formed from the chemical reaction.

The __________ states that the total mass of the reactants must equal the mass of the products.