Key Terms

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Across
  1. 3. The ability to do work. Especially in biology, the driver of the physical and chemical processes necessary for life.
  2. 4. A class of organic compounds that serve as the building blocks for the information storage molecules DNA and RNA.
  3. 6. The substances formed during a chemical reaction, usually indicated on the right-hand side of the chemical equation.
  4. 9. A measurement of the average speed of the particles within a substance.
  5. 10. change A change in a substance that does not change to identity of the substance
  6. 14. A pure substance made of only one kind of atom.
  7. 15. The attraction between like particles within polar substances.
  8. 17. compound A covalently bonded compound containing the element carbon.
  9. 20. An organic compound comprised of the elements carbon, hydrogen, and oxygen; includes sugars, starch, and cellulose.
  10. 21. The smallest particle of a covalently bonded compound.
  11. 22. A substance that can produce hydroxide ions (OH-) or accept hydrogen ions (H+) in solution.
  12. 23. A class of nonpolar organic compounds that are insoluble in water and are used for energy storage and cell membranes in living things.
  13. 24. The process by which particles in solution are evenly distributed throughout the solvent by Brownian motion.
  14. 25. A class of simple organic compounds important in living things as a source of both energy and structure.
Down
  1. 1. A substance that can produce hydrogen ions (H+) in solution.
  2. 2. The building block of matter; the smallest possible particle of an element.
  3. 3. the tendency of energy to disperse and become less available to do work.
  4. 5. A substance that binds to an enzyme and reduces its activity, thus slowing a chemical reaction that the enzyme catalyzes.
  5. 6. Quality of molecules having an uneven distribution of electrical charge, resulting in some regions of a molecule having negative charge while others are positive.
  6. 7. The physical stuff that makes up the universe. Anything that occupies space and has mass.
  7. 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.
  8. 11. acid A class of organic compounds that serve as the building blocks of proteins.
  9. 12. The process by which one substance, the solute, is broken up into smaller pieces by and distributed within a second substance, the solvent.
  10. 13. An attraction between two atoms as a result of sharing or transferring valence electrons.
  11. 16. A naturally occurring catalyst, usually a protein.
  12. 18. The attraction of particles in one substance for particles in a different substance.
  13. 19. A substance that changes the rate of a chemical reaction but is not itself used up or affected by the reaction.
  14. 20. change 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.