Chapter Bio Key Terms

4. A substance that is present before a chemical reaction and takes part in it, usually shown on the lefthand side of a chemical equation.
7. Quality of molecules having an uneven distribution of electrical charge, resulting in some regions of a molecule having negative charge while others are positive.
8. a measurement of the average speed of the particles within a substance.
9. A class of organic compounds that serve as the building blocks for the information storage molecules DNA and RNA
12. the building block of matter; the smallest possible particle of an element.
13. A class of organic compounds that serve as the building blocks of proteins.
15. A substance that binds to an enzyme and reduces its activity, thus slowing a chemical reaction that the enzyme catalyzes
18. A class of simple organic compounds important in living things as a source of both energy and structure.
20. 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.
23. A class of nonpolar organic compounds that are insoluble in water and are used for energy storage and cell membranes in living things.
24. the tendency of energy to disperse and become less available to do work.
26. The attraction between like particles within polar substances.
27. An attraction between two atoms as a result of sharing or transferring valence electrons.

1. the physical stuff that makes up the universe. Anything that occupies space and has mass.
2. A covalently bonded compound containing the element carbon.
3. A naturally occurring catalyst, usually a protein.
5. A substance that changes the rate of a chemical reaction but is not itself used up or affected by the reaction.
6. The smallest particle of a The smallest particle of a covalently bonded compound.
10. A substance that can produce hydroxide ions (OH) accept hydrogen ions (H+) in solution.
11. An organic compound comprised of the elements carbon, hydrogen, and oxygen; includes sugars, starch and cellulose.
12. The attraction of particles in one substance for particles in a different substance.
14. the ability to do work. Especially in biology, the driver of the physical and chemcial processes necessary for life.
16. A change in a substance that does not change the identity of the substance.
17. A pure substance made from two or more elements that are chemically combined.
19. a pure substance made of only one kind of atom.
21. A substance that can produce hydrogen ions (H+) solution. .
22. The process by which particles in solution are evenly distributed throughout the solvent by Brownian motion
25. The substances formed during a chemical reaction, usually indicated on the righthand side of a chemical equation