Unit 2 Vocab

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Across
  1. 2. the amount of heat needed to raise the temperature of 1 gram of a substance 1 degree Celsius (°C)
  2. 3. type of bond between atoms in which the electrons are shared
  3. 5. reactant of an enzyme-catalyzed reaction
  4. 7. force of attraction between different kinds of molecules
  5. 11. a combination of 2 or more elements connected by bonds
  6. 12. attraction between molecules of the same substance
  7. 14. substance formed as a result of a chemical reaction
  8. 17. elements or compounds that enter into a chemical reaction
  9. 19. a reaction that absorbs energy (absorbs heat)
  10. 21. the basic unit of matter
  11. 23. chemical bond formed when one or more electrons are transferred from one atom to another
  12. 24. negatively charged particle that orbits the nucleus in the electron cloud
  13. 28. a reaction that releases energy (gives off heat)
  14. 29. substance that speeds up the rate of a chemical reaction
  15. 30. (chemistry definition) the center of an atom, which contains the protons and neutrons
Down
  1. 1. electron found in the outermost shell of an atom; helps to determine bonding
  2. 4. process that changes, or transforms, one set of chemicals into another set of chemicals
  3. 6. weak attraction between a hydrogen atom and another atom
  4. 8. energy that is needed to get a reaction started
  5. 9. a reaction in living organisms that builds molecules (requires energy)
  6. 10. equal to the total number of protons and neutrons in the nucleus of an atom (based on average mass from isotopes)
  7. 13. one- or two-letter abbreviation for a chemical element name
  8. 15. 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)
  9. 16. pure substance that consists entirely of one type of atom
  10. 18. action tendency of water to rise in a thin tube
  11. 20. biological catalysts
  12. 22. in a molecule, uneven distribution of electrons (results in (+) and (-) poles) ex. water
  13. 25. particle found in the nucleus that has no charge
  14. 26. a reaction in living organisms that breaks down complex molecules (releases energy)
  15. 27. positively charged particle found in the nucleus of an atom