Biology Chapter 2 Crossword - Peyton Laughner

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