| Term | Definition |
|---|---|
| base | The chemical opposite of acid |
| ph | A term that means potential for hydrogen |
| antacid | A base that works against the acid upsetting your stomach |
| crystals | Solids that have a regular, repeating arrangement of atoms |
| exothermic reaction | When heat energy is released during a chemical reaction. |
| reactants | The substances you start with in a chemical reaction |
| endothermic reaction | When heat energy is absorbed during a chemical reaction. |
| gemstones | Valuable crystals often used to make jewelry. |
| catalyst | A substance that speeds up a chemical reaction without being used up in the process. |
| physical reaction | A reaction that doesn't change the molecules of a substance but changes how the substance looks and sometimes its state. |
| chemical reaction | When two or more chemical substances interact with each other and change into different chemical substances. |
| acid | A substance that tastes sour, conducts electricity, ruins metals, and donates hydrogen ions. |
| plastic | A type of polymer that is hard to break and can be recycled. |
| polymer | Molecules arranged in long chains of lots of repeating small molecules. |
