Crude Oil, Chemical reactions

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Across
  1. 2. Unwanted substances in crude oil, such as dirt or extra elements, that need to be removed.
  2. 7. A number that measures how light or heavy crude oil is compared to water (API .......).
  3. 8. Breaking down a substance into smaller parts, like when oil is heated in a reaction.
  4. 9. A yellow element in crude oil that can make it smell bad and cause pollution.
  5. 10. How thick or sticky a liquid like oil is, which changes with temperature.
  6. 11. A chemical reaction where oil burns and produces heat and gases.
  7. 12. A starting material in a chemical reaction.
Down
  1. 1. How much mass is in a certain volume, like comparing oil to water in a test.
  2. 3. A solid that forms and falls out of a liquid during a chemical reaction.
  3. 4. The process of cleaning and changing crude oil into useful products like gasoline.
  4. 5. A way to write a chemical reaction with symbols.
  5. 6. A chemical compound made of hydrogen and carbon, the main part of crude oil.