Biology - Chapter 2

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Across
  1. 1. substance present before a chemical reaction and takes place in it
  2. 3. the building block of matter; the smallest possible particle of an element
  3. 4. 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 the original substance
  5. 7. process by which particles in solution are evenly distributed throughout the solvent by Brownian motion
  6. 9. process by which one substance, the solute, is broken up into smaller pieces by and distributed within a second substance, the solvent
  7. 10. substance that produces hydroxide ions or accepts hydrogen ions in solution
  8. 13. class of nonpolar organic compounds that are insoluble in water and are used for energy storage and cell membranes in living things
  9. 14. substance formed during a chemical reaction
  10. 15. tendency of energy to disperse and become less available to do work
  11. 16. a change in a substance that does not change the identify of the substance
  12. 21. a measurement of the average speed of the particles within a substance
  13. 23. organic compound comprised of the elements carbon, hydrogen, and oxygen
  14. 24. naturally occurring catalyst, usually a protein
  15. 26. the smallest particle of a covalently bonded compound
  16. 27. 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. attraction of particles in one substance for particles in a different substance
  3. 5. substance that binds to an enzyme and reduces its activity
  4. 8. attraction of like particles within polar substances
  5. 11. substance that produces hydrogen ions in solution
  6. 12. 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 kind of atom
  8. 17. class of simple organic compounds important in living things as a source of energy and structure
  9. 18. the ability to do work; the driver of the physical and chemical processes necessary for life
  10. 19. having an uneven distribution of electrical charge
  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. class of organic compounds that serve as the building blocks for the information storage molecules in DNA and RNA