| A | B |
|---|
| chemical change | An entirely new substance is made. Some clues that this is happening are bubbles, color change, and energy gained or lost. |
| chemical equation | H2 + O2 --> H2O is an example |
| compound | A pure substance that is made of 2 or more elements chemically bonded together. Salt, sugar, water, and hydrocloric acid (HCl) are examples. |
| density | The amount of matter in an amount of space. Mass divided by volume. Salt water has more of this than freshwater. |
| element | A pure substance that is made up of atoms that all have the same number of protons. |
| product | The substances that are made by a chemical reaction. They are on the right side of a chemical equation. |
| reactant | The substances that start a chemical reaction. They are on the left side of the chemical equation. |
| atom | The smallest part of an element that has the properties of that element. |
