Chapter 2 Crossword-Vivian Befus

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Across
  1. 3. The tendency of energy to disperse
  2. 6. The attrition of water molecules for each other
  3. 7. Pure substance made of only one kind of atom
  4. 8. Class of organic compounds that serve as the building blocks for the information storage molecules: DNA and RNA
  5. 11. The substance formed during a chemical reaction
  6. 12. A measurement of the speed at which particles move
  7. 13. Changes that don't change matters identity
  8. 14. Nonpolar molecules
  9. 18. Basic building blocks of matter
  10. 19. Organic compounds made of carbones, hydrogens and oxygen
Down
  1. 1. A naturally occurring catalyst, usually a protein
  2. 2. A pure substance made of two or more elements chemically combined
  3. 4. A substance that is present before a chemical reaction
  4. 5. Attrition of particles in one substance for particles in a different substance
  5. 9. A change in substances that results in one or more new substances being formed
  6. 10. The immaterial stuff that gets things done
  7. 15. A substance that provides a alternate route from reactants to products
  8. 16. A class of organic compounds that serve as the building blocks of proteins
  9. 17. Simple carbohydrate
  10. 20. Stored chemical energy that holds two atoms together