Crossword Puzzle Chapter 2

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Across
  1. 1. A substance that is present before a chemical re­action and takes part in it, usually shown on the left­hand side of a chemical equation.
  2. 3. The building block of matter; the smallest possible particle of an element.
  3. 4. An attraction between two atoms as a result of shar­ing or transferring valence electrons.
  4. 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.
  5. 7. The process by which particles in solution are evenly distributed throughout the solvent by Brownian motion.
  6. 9. The process by which one substance, the sol­ute, is broken up into smaller pieces by and distributed within a second substance, the solvent.
  7. 10. A substance that can produce hydroxide ions (OH+) or­ accept hydrogen ions (H+) in solution.
  8. 13. A class of nonpolar organic compounds that are in­ soluble in water and are used for energy storage and cell membranes in living things.
  9. 14. The substances formed during a chemical reaction, usually indicated on the right­hand side of a chemical equation.
  10. 15. The tendency of energy to disperse and become less available to do work.
  11. 16. A chang e in a substance that does not change the identity of the substance (e.g., a change of form or state).
  12. 21. A measurement of the average speed of the particles within a substance.
  13. 23. An organic compound comprised of the ele­ments carbon, hydrogen, and oxygen; includes sugars, starch and cellulose.
  14. 24. A naturally occurring catalyst, usually a protein.
  15. 26. The smallest particle of a covalently bonded com­pound.
  16. 27. A class of organic compounds that serve as the building blocks of proteins.
Down
  1. 2. A pure substance made from two or more ele­ments that are chemically combined.
  2. 3. The attraction of particles in one substance for particles in a different substance.
  3. 5. A substance that binds to an enzyme and re­duces its activity, thus slowing a chemical reaction that the enzyme catalyzes.
  4. 8. The attraction between like particles within polar substances.
  5. 11. A substance that can produce hydrogen ions (H+) in solution.
  6. 12. A substance that changes the rate of a chemical re­action but is not itself used up or affected by the reaction.
  7. 15. A pure substance made of only one kind of atom.
  8. 17. A class of simple organic compounds important in living things as a source of both energy and structure.
  9. 18. The ability to do work. Especially in biology, the driver of the physical and chemical processes necessary for life.
  10. 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.
  11. 20. A covalently bonded compound con­taining the element carbon.
  12. 22. The physical stuff that makes up the universe. Any­thing that occupies space and has mass.
  13. 25. A class of organic compounds that serve as the building blocks for the information storage molecules DNA and RNA.