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1. chemical: an element or compound 8. compound: a chemical combination of two or more elements
2. chemical change: a chemical reaction; a process that changes substances into new substances (related word: chemical reaction) 9. molecule: two or more atoms joined together
3. physical reaction: a change in matter that does not affect its chemical composition 10. element: a pure substance that cannot be broken down into simpler substances by chemical reactions
4. chemical reaction: a chemical change; a process that changes substances into new substances (related word: chemical change)
5. acid: any substance with a pH less than 7; acids turn blue litmus paper red
6. atom: the smallest unit of an element that has the properties of that element
7. matter: material that has mass and takes up some amount of space
Created by: Mgsd1542314