Chapter 2

1. a substance that is present before a chemical reaction and stake part in it
3. the building blocks of matter
4. an attraction between two atoms as a result of sharing or transferring valence electrons
6. a change in a substance that results in one or more new substances being formed that have different physical and chemical properties than those of the original substance
7. the process by which particles in solution are evenly distributed throughout the solvent by brownian motion
9. the process by which one substance the solute, is broken up into smaller pieces by and distributed within a second substance the solvent
10. a substance that can produce hydroxide ions or accept hydrogen ions in solution
13. a class of nonpolar organic compounds that are insoluble in water and are used for energy storage and cell membranes in living things
14. the substances formed during a chemical reaction
15. the tendency of energy to disperse and become less available to do work
16. a change in a substance that does not change the idenity of the substance
21. a measurement o the average speed of the particles within a substance
23. an organic compound comprised of the elements carbon, hydrogen, and oxygen
24. a naturally occurring catalyst, usually a protein
26. the smallest paritcle of a covalently bonded compound
27. a class of organic compounds that serve as the building blocks of proteins

2. a pure substance made from two or more elements that are chemically combined
3. the attraction of particles in one substance for particles in a different substance
5. a substance that binds to an enzyme and reduces its activity
8. the attraction between like particles within polar substances
11. a substance that can produce hydrogen ions in solution
12. a substance that changes the rate of chemical reaction but is not itself used up or affected by the reaction
15. a pure substance made of only one kind of atom
17. a class of simple organic compounds important in living things as a source of both energy and structure
18. the ability to do work
19. quality of molecules having an uneven distribution of electrical charge resulting in some regions of a molecule having negative charge while others are positive
20. a covalently bonded compound containing the element carbon
22. the physcial stuff that makes up the universe
25. a class organic compounds that serve as the building blocks for the information storage molecules DNA and RNA