Conservation of Mass

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Across
  1. 2. small number to the right of chemical symbols that tells the number of atoms of each element
  2. 5. group of atoms bonded together
  3. 8. the chemical ______ is the process by which one or more substances react to produce one or more different substances
  4. 13. Matter is neither created nor destroyed during a chemical reaction; atoms are rearranged
  5. 14. big number in front of a chemical formula; identifies the number of molecules
  6. 15. anything that has mass and takes up space
  7. 16. a substance made up of one type of atom that cannot be broken down into simpler substances
  8. 18. an equation where the number of atoms on the left side equal the number of atoms on the right side of the equation
  9. 19. starting substances in a chemical reaction that react with one another
Down
  1. 1. a substance that changes the rate of a chemical reaction (speeds up a chemical reaction)
  2. 3. a substance that is formed as the result of a chemical reaction
  3. 4. one or two letters that represent an element
  4. 6. a chemical ________representation of a chemical reaction the uses symbols to show the relationship between reactants and products
  5. 7. to save or hold; start and end with the same amount
  6. 9. a chemical ________ is a combination of chemical symbols (letters) and numbers to represent a substance
  7. 10. a substance made up of atoms of two or more different elements chemically combined
  8. 11. amount of matter in an object
  9. 12. basic unit of all matter; smallest particle of an element
  10. 17. to make or produce; represented as an arrow in a chemical equation
  11. 18. force of attraction that holds atoms together in a molecule