Judah Lemke's Ch2 crossword.

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