semester 1 physical science extra credit

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Across
  1. 3. a compound is made from simpler materials
  2. 4. a change that can be reversed
  3. 9. a degree of compactness of a substance
  4. 11. a process of rotting
  5. 14. the kind of elements on the right side of the periodic table
  6. 15. same number of protons but different number neutrons
  7. 18. a subatomic with a negative charge
  8. 21. a change that cannot be reversed
  9. 23. a reaction that happens when heat is absorbed
  10. 24. a subatomic with a neutral charge
Down
  1. 1. a compound containing hydrogen and oxygen
  2. 2. substances that take part in chemical reaction
  3. 5. a release of heat
  4. 6. a substance that is at the end of a chemical reation
  5. 7. a place where all the elements are orginized
  6. 8. the positive and negative ions in two compounds switch places
  7. 10. a usually formal statement of the equality or equavalence of a mathematical or logical expressions
  8. 12. an atom with a net charge
  9. 13. an element that starts out by itself replaces another element in a compound
  10. 16. a subatomic with a positive charge
  11. 17. metal and chemical bond
  12. 19. both elements are chemicals bond
  13. 20. how a substance reacts chemically with other substances
  14. 22. the kind of elements on the left side of the periodic table