Across
- 3. macromolecule made mostly from carbon and hydrogen atoms; includes fats, oils, and waxes
- 7. A substance made up of atoms of two or more different elements joined by chemical bonds
- 8. macromolecule that contains carbon, hydrogen, oxygen, and nitrogen; needed by the body for growth and repair
- 9. smallest unit of most compounds
- 12. A type of protein that acts as a catalyst speeding up a chemical reaction in a living thing
- 13. (bond)attractive force that holds atoms or ions together
- 15. an attraction between molecules of the same substance
- 18. the minimum amount of energy required to start a chemical reaction
Down
- 1. A pure substance made of only one kind of atom
- 2. (acid)macromolecule containing hydrogen, oxygen, nitrogen, carbon, and phosphorus, present in DNA and RNA
- 4. attraction between molecules of different substances
- 5. A substance that decreases the hydrogen ion concentration in a solution, 8-14 on the pH scale
- 6. basic unit of matter
- 8. (scale)measurement system used to indicate the concentration of hydrogen ions (H+) in solution, how acidic or basic the solution is; ranges from 0 to 14
- 10. (bond)weak attraction between a hydrogen atom and another atom
- 11. macromolecule made up of carbon, hydrogen, and oxygen atoms; major source of QUICK energy for the human body
- 14. A mixture that forms when one substance dissolves another
- 16. A substance that increases the hydrogen ion concentration of a solution, 1-6 on the pH scale
- 17. substance that speeds up the rate of a chemical reaction