Chemistry

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Across
  1. 2. a chemical reaction in which heat turns into chemical potential, making the surroundings colder
  2. 4. the densely packed center or core of an atom
  3. 7. a substance that speeds up a chemical reaction without being changed itself
  4. 9. type of bond between atoms that are sharing electrons
  5. 10. a substance that slows down a chemical reaction
  6. 12. a substance made of only one type of atom
  7. 13. two or more elements chemically combined
Down
  1. 1. a chemical reaction in which chemical potential turns into heat, making the surroundings warmer
  2. 3. a substance at the start of a reaction (on the left side of the arrow in a chemical equation)
  3. 5. the negatively charged subatomic particle
  4. 6. the positively charged subatomic particle
  5. 8. type of electron that is found on the outer edge or outermost energy level of an atom
  6. 11. type of bond between atoms when one atom steals an electron from another