Chapter 2 crossword puzzle - Kivrin Haines

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Across
  1. 2. A pure substance made of only one kind of atom.
  2. 5. A class of organic compounds that serve as the building blocks of proteins.
  3. 8. A measurement of the average speed of the particles within a substance.
  4. 9. A substance that is present before a chemical re­ action and takes part in it, usually shown on the left­hand side of a chemical equation.
  5. 10. A class of nonpolar organic compounds that are in­ soluble in water and are used for energy storage and cell membranes in living things.
  6. 12. An organic compound comprised of the ele­ ments carbon, hydrogen, and oxygen; includes sugars, starch and cellulose.
  7. 13. A change in a substance that does not change the identity of the substance (e.g., a change of form or state).
  8. 15. The tendency of energy to disperse and become less available to do work.
  9. 19. The substances formed during a chemical reaction, usually indicated on the right­hand side of a chemical equation.
  10. 20. The attraction between like particles within polar substances
Down
  1. 1. The attraction of particles in one substance for particles in a different substance.
  2. 3. A naturally occurring catalyst, usually a protein.
  3. 4. An attraction between two atoms as a result of shar­ ing or transferring valence electrons.
  4. 6. A change in a substance that results in one or more new substances being formed that have dif­ ferent physical and chemical properties than those of the original substance.
  5. 7. A class of organic compounds that serve as the building blocks for the information storage molecules DNA and RNA.
  6. 11. A substance that changes the rate of a chemical re­ action but is not itself used up or affected by the reaction.
  7. 14. A pure substance made from two or more ele­ ments that are chemically combined.
  8. 16. A class of simple organic compounds important in living things as a source of both energy and structure.
  9. 17. The building block of matter; the smallest possible particle of an element.
  10. 18. The ability to do work. Especially in biology, the driver of the physical and chemical processes necessary for life.