Unit 2 Review

12345678910111213141516171819202122232425
Across
  1. 3. material composed of two or more elements or compounds that are physically mixed together but not chemically combined
  2. 5. elements or compounds produced by a chemical reaction
  3. 7. one of several forms of a single element, which contains the same number of protons but different numbers of neutrons
  4. 9. small chemical unit that makes up a polymer
  5. 11. substance that speeds up the rate of a chemical reaction
  6. 12. macromolecule that contains carbon, hydrogen, oxygen and nitrogen; needed by the body for growth and repair
  7. 15. type of mixture in which all the components are evenly distributed
  8. 16. macromolecule made mostly from carbon and hydrogen atoms; includes fats, oils, and waxes
  9. 19. force of attraction between different kinds of molecules
  10. 20. protein catalyst that speeds up the rate of specific biological reactions
  11. 21. the center of an atom, which contains the protons and neutrons
  12. 22. compound made up of carbon, hydrogen, and oxygen atoms; type of nutrient that is the major source of energy for the body
  13. 23. a compound that prevents sharp, sudden changes in pH
  14. 24. the basic unit of matter
  15. 25. molecules composed of many monomers; makes up macromolecules
Down
  1. 1. process that changes, or transforms, one set of chemicals into another set of chemicals
  2. 2. a compound that forms hydrogen ions (H+) in solution; a solution with a pH of less than 7
  3. 4. energy that is needed to get a reaction started
  4. 6. substance that is dissolved in a solution
  5. 8. mixture of water and nondissolved material
  6. 10. elements or compounds that enter into a chemical reaction
  7. 13. dissolving substance in a solution
  8. 14. reactant of an enzyme-catalyzed reaction
  9. 17. a compound that produces hydroxide ions (OH-) in solution; a solution with a pH of more than 7
  10. 18. substance formed by the chemical combination of two or more elements in definite proportions
  11. 20. pure substance that consists entirely of one type of atom
  12. 22. attraction between molecules of the same substance