Across
- 2. a substance made of atoms of different elements
- 6. two or more atoms bonded together
- 9. substances formed by a chemical reaction
- 11. attraction between different substances
- 12. starting materials in a chemical reaction
- 13. substances that accept hydrogen ions or release hydroxide ions
- 14. energy needed to start a reaction
- 15. proteins that speed up chemical reactions
- 16. molecules made of amino acids
Down
- 1. building blocks of nucleic acids
- 2. attraction between molecules of the same substance
- 3. sugars and starches used for energy
- 4. a pure substance made of one type of atom
- 5. the molecule an enzyme acts on
- 7. fats and oils that store energy
- 8. the smallest unit of matter
- 10. molecule carrying genetic information
- 11. substances that release hydrogen ions in solution
- 13. forces that hold atoms together