Chapter 2 (Chemistry of Life)

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Across
  1. 4. / are the substances made by a chemical reaction.
  2. 6. is the substance that is present in the greater amount and that dissolves another substance.
  3. 7. forms through the electrical force between oppositely charged ions.
  4. 8. are nonpolar molecules that includes fats, oils, and cholesterol.
  5. 9. energy / is the amount of energy that will break a bond between two atoms.
  6. 10. are polymers that are made up of monomers called nucleotides.
  7. 13. are chains of carbon atoms bonded to hydrogen atoms.
  8. 15. are molecules composed of carbon, hydrogen, and oxygen, and they include sugars and starches.
  9. 16. each subunit in the complete molecule.
  10. 18. / chemical reaction absorbs more energy that it releases.
  11. 19. / chemical reaction releases more energy that it absorbs.
  12. 20. an atom that has gained or lost one or more electrons.
  13. 21. one particular type of atom and it cannot be broken down into simpler substance by ordinary chemical means.
  14. 23. / the specific reactants that an enzyme acts on.
  15. 24. / a substance that decreases the activation energy needed to start a chemical reaction and also increases the rate of the chemical reaction.
  16. 26. energy / is the amount of energy that needs to be absorbed for a chemical reaction to start.
  17. 29. / are catalysts for chemical reactions in living things.
  18. 31. the measure of a solution’s acidity.
  19. 32. compounds that remove H+ ions from a solution.
  20. 33. a mixture of substances that is the same throughout.
Down
  1. 1. is an attraction between a slightly positive hydrogen atoms and a slightly negative atom.
  2. 2. the attraction among molecules of a similar substance.
  3. 3. change substances into different substances by breaking and forming chemical bonds.
  4. 5. forms when atoms share a pair of electrons.
  5. 11. are molecules that contain carbon, hydrogen, nitrogen, and sometimes sulfur.
  6. 12. the smallest basic unit of matter.
  7. 14. is two or more atoms held together by covalent bonds.
  8. 17. / are the substances changes during a chemical reaction.
  9. 18. / is reached when both the reactants and products are made at the same rate.
  10. 22. is a polymer made of monomers called amino acids.
  11. 25. is a compound that releases a proton when it dissolves in water.
  12. 27. a substance made of atoms of different elements bonded together in certain ratio.
  13. 28. the attraction among molecules of different substances.
  14. 30. is a substance that dissolves in a solvent.
  15. 31. is a large molecule, or macromolecule, made of many monomers bonded together.