Across
- 4. pure substance formed when two or more different elements are combined
- 7. atoms of the same element that have different numbers of neutrons
- 8. particles that have no charge
- 9. mixtures that can react with acids or bases to keep the pH within the 6.5 to 7.5 pH range
- 13. fats
- 14. substance in which another substance is dissolved
- 16. pure substance
Down
- 1. a substance that lowers the activation energy
- 2. an atom that has lost or gained one r more electrons
- 3. speed up the rate of chemical reactions
- 4. composed of carbon and hydrogen
- 5. a compound in which the atoms are held together by covalent bonds
- 6. staring substance (left side of arrow)
- 10. the reactants that bind to the enzyme
- 11. contain amino acids
- 12. a combination of two or more substances
- 15. substances that release hydroxide ions hen they are dissolved in water