PS Review Semester 1 - 2021

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Across
  1. 4. Carbon dioxide and water are usually the products in this type of reaction
  2. 7. one sign of a chemical reaction taking place
  3. 11. the amount of time it takes for one half of a sample to decay
  4. 12. electrons have this charge
  5. 14. displacement AB + C → AC + B
  6. 17. the bonding where electrons are shared
  7. 22. these gases do not react because they are completely stable on their own
  8. 23. anything that takes up space and has mass
  9. 24. adding protons and neutrons
  10. 25. when a chemical reaction takes in heat
  11. 28. a charged particle
  12. 29. neutrons have this charge
  13. 30. this element radioactively decays into Lead
  14. 32. protons have this charge
  15. 34. adding this to a reaction can speed it up
  16. 36. number of protons
  17. 38. orbit the nucleus
Down
  1. 1. AB → A + B
  2. 2. A + B → AB
  3. 3. number of electrons the 2nd energy level can hold
  4. 5. another name for electron energy levels
  5. 6. center of an atom
  6. 8. displacement AB + CD → AD + BC
  7. 9. happens in nuclear energy when one reaction sets off another and another
  8. 10. the spontaneous process in which an atomic nucleus emits radiation
  9. 13. the bonding where electrons are transferred
  10. 15. father of the Periodic Table of Elements
  11. 16. Column 1 of the periodic table are these types of metals
  12. 18. the middle part of the periodic table, which we colored red, are these metals
  13. 19. chemicals listed to the right of the arrow in a chemical reaction
  14. 20. chemicals listed to the left of the arrow in a chemical reaction
  15. 21. when a chemical reaction releases energy
  16. 26. outer electrons can be called this
  17. 27. the reason atoms combine with each other
  18. 31. the conservation of ______ says that matter cannot be created or destroyed
  19. 33. ability of an atom to attract electrons to itself
  20. 35. number of electron energy levels and also the number of rows in the periodic table
  21. 37. atoms with the same number of protons but different number of neutrons
  22. 38. when an electron gains energy, it moves from a grounded state to this state