unit 2 chemistry of life

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Across
  1. 2. macromolecule made up of amino acids
  2. 5. a reaction that absorbs energy (absorbs heat)
  3. 7. pure substance that consists entirely of one type of atom
  4. 8. molecules composed of many monomers; makes up macromolecules
  5. 9. the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table (also equals the number of electrons in an element)
  6. 13. substance formed as a result of a chemical reaction
  7. 14. small chemical unit that makes up a polymer
  8. 16. electron- electron found in the outermost shell of an atom; helps to determine bonding
  9. 18. substance that speeds up the rate of a chemical reaction
  10. 20. energy that is needed to get a reaction started
  11. 24. equal to the total number of protons and neutrons in the nucleus of an atom (based on isotopes)
  12. 25. one- or two-letter abbreviation for a chemical element name
  13. 26. positively charged particle found in the nucleus of an atom
  14. 28. compound with an amino group on one end and a carboxyl group on the other end
  15. 29. elements or compounds that enter into a chemical reaction
Down
  1. 1. a large organic molecule made up of many atoms (like proteins)
  2. 3. a reaction that releases energy (gives off heat)
  3. 4. subunit of which nucleic acids are composed; made up of a 5-carbon sugar, a phosphate group, and a nitrogenous base
  4. 6. particle found in the nucleus that has no charge
  5. 10. negatively charged particle that orbits the nucleus in the electron cloud
  6. 11. biological catalysts
  7. 12. compound made up of carbon, hydrogen, and oxygen atoms; type of nutrient that is the major source of energy for the body
  8. 15. reactant of an enzyme-catalyzed reaction
  9. 17. (chemistry definition) the center of an atom, which contains the protons and neutrons
  10. 19. type of bond between atoms in which the electrons are shared
  11. 21. a combination of 2 or more elements connected by bonds
  12. 22. the basic unit of matter
  13. 23. macromolecule made mostly from carbon and hydrogen atoms; includes fats, oils, and waxes
  14. 27. macromolecules containing hydrogen, oxygen, nitrogen, carbon, and phosphorus