Vocabulary Choice Board Unit 9- Crossword Puzzle

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Across
  1. 4. the law that states that mass cannot be created or destroyed in ordinary chemical and physical changes.
  2. 9. A rapid reaction between oxygen and fuel that results in fire.
  3. 10. A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.
Down
  1. 1. a substance that forms in a chemical reaction.
  2. 2. A chemical substance that is present at the start of a chemical reaction.
  3. 3. one element replaces another element in a compound.
  4. 5. a chemical reaction where two elements in different compounds trade places.
  5. 6. a reaction in which two or more substances combine to form a new compound.
  6. 7. A chemical reaction that breaks down compounds into simpler products.
  7. 8. A number written slightly below and to the right of a chemical symbol that shows how many atoms of an element are in a compound.