Across
- 1. elements or compounds that enter into a chemical reaction
- 5. a pure substance made of only one kind of atom
- 7. a change in which one or more substances are converted into new substances
- 10. a chemical bond formed when two atoms share valence electrons
- 11. the elements or compounds produced by a chemical reaction
- 12. two or more atoms held together by covalent bonds
- 13. the smallest particle of an element that still has the properties of that element
Down
- 2. numbers representing the number of units of each substance that are taking part in a chemical reaction
- 3. a group of chemical symbols and numbers that represent the elements and the number of atoms of each element that make up a compound
- 4. electrons in the outermost energy level of an atom that are involved in chemical reactions
- 6. matter is neither created nor destroyed in a chemical reaction
- 8. a way to describe a chemical reaction using chemical formulas and other symbols
- 9. a substance made up of atoms of two or more different elements joined by chemical bonds