Chapter 2 crossword - Eric Hoang

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Across
  1. 3. A substance that changes the rate of a chemical reaction but is not itself used up or affected by the reaction.
  2. 8. A pure substance made from two or more elements that are chemically combined.
  3. 10. The attraction of particles in one substance for particles in a different substance.
  4. 11. A class of nonpolar organic compounds that are in­ soluble in water and are used for energy storage and cell membranes in living things.
  5. 13. a change in a substance that results in one or more new substance
  6. 16. the tendency of energy to disperse
  7. 17. The attraction between like particles within polar substances.
  8. 18. An organic compound comprised of the elements carbon, hydrogen, and oxygen; includes sugars, starch and cellulose.
  9. 19. the ability to do work
  10. 20. A class of simple organic compounds important in living things as a source of both energy and structure.
Down
  1. 1. An autotrophic organism, that is, one that can produce its own food from light or chemical energy.
  2. 2. the basic buildings blocks of matter
  3. 4. A class of organic compounds that serve as the building blocks of proteins.
  4. 5. a change in a substance that does not change the identity of the substance
  5. 6. A substance that is present before a chemical reaction and takes part in it, usually shown on the left­hand side of a chemical equation.
  6. 7. An attraction between two atoms as a result of sharing or transferring valence electrons.
  7. 9. pure substances made of only on kind of atom
  8. 12. a measurement of the average speed of the particles within a substance
  9. 14. A class of organic compounds that serve as the building blocks for the information storage molecules DNA and RNA.
  10. 15. A naturally occurring catalyst, usually a protein.