chemical reactions

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Across
  1. 1. Chemical compound with oxygen.
  2. 4. substance that speeds up a chemical reaction, or lowers the temperature or pressure needed to start one.
  3. 5. Reaction where electrons are released.
  4. 6. Substance formed in a chemical reaction.
  5. 7. Reaction in which one substance emits electrons and another substance takes up electrons.
  6. 8. Process where substances react with each other and form new substances with different properties.
  7. 9. Brown, a crumbly chemical compound formed when iron reacts with oxygen and water.
Down
  1. 2. chemical reactions in which the reactants absorb heat energy from the surroundings to form products.
  2. 3. Substance that reacts with another substance in a chemical reaction.
  3. 7. reaction where electrons are taken up.