Science Homework

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Across
  1. 1. A new substance thats formed after a chemical reaction
  2. 5. The fundamental building block of all matter
  3. 6. A chemical reaction when oxygen reacts with a hydrocarbon to produce heat and light
  4. 7. A chemical reaction where the positive and negative ions switch places, forming brand new compounds
  5. 8. A chemical reaction where two substances combine to make one simpler substance
  6. 9. The starting substance that gets changed during a chemical reaction
  7. 11. An atom with a charge based on the gain or loss of electrons
Down
  1. 2. When reactants change into new products
  2. 3. When one element replaces another element forming a new compound
  3. 4. When a compound breaks down into two or more simpler substances
  4. 10. The simplest type of atom