Chemistry Exam Review

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Across
  1. 2. A bond is formed
  2. 4. an ion that gains an electron
  3. 6. A reaction that gives off heat
  4. 9. an ion that loses an electron
  5. 10. sharing electrons in a bond
  6. 14. how heavy an atom is
  7. 16. groups on periodic table
  8. 18. decay that releases purely energy
  9. 19. A reaction where one element is replaced
  10. 22. absorbs heat
  11. 24. rows on periodic table
  12. 26. new substance is formed during reaction
  13. 28. a substance that can be split
  14. 29. outside of a nucleus where electrons are
  15. 31. decay that releases electron+neutron
  16. 35. liquid to gas
  17. 36. power in a battery
  18. 40. solid to liquid
  19. 43. no substance is formed during reaction
  20. 44. an atom that has lost or gained electron
  21. 45. a guess based on evidence
  22. 46. a bond with 2+ atoms
  23. 47. decay that releases positron+neutron
  24. 49. releases heat
  25. 50. a variable that is not changed
Down
  1. 1. Combining 2 small nuclei
  2. 3. a particle with a neutral charge
  3. 5. a statement based on senses
  4. 7. center of an atom
  5. 8. liquid to solid
  6. 11. decay that releases 2 protons+2 neutrons
  7. 12. extremely fast moving particles
  8. 13. electrons in the outer shell
  9. 15. a particle on the outside of the nucleus
  10. 17. bond electrons are taken or given
  11. 20. result of a reaction
  12. 21. the variable measured in an experiment
  13. 23. If an atom has 5 electrons, what does it do?
  14. 25. A bond is broken
  15. 27. protons+electrons
  16. 30. starting material that goes under change
  17. 32. 0-6
  18. 33. a particle with a positive charge
  19. 34. 7 on the PH scale
  20. 37. scale 0-14
  21. 38. Splitting a heavy nucleus
  22. 39. gas to liquid
  23. 41. 8-14
  24. 42. if an atom has 2 electrons, what does it do?
  25. 48. basic unit