Chapter 2

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

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