Chemistry Notes

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Across
  1. 1. (ree-DUK-shun) refers to either the loss of oxygen or the addition of hydrogen
  2. 4. Oxidation and reduction always occur simultaneously and are referred to as a
  3. 5. this kind of mixture is a combination of two or more substances united physically in any proportions without a fixed composition.
  4. 7. is a chemical reaction that requires the absorption of energy or heat from an external source for the reaction to actually occur.
Down
  1. 2. When certain chemical reactions release energy in the form of heat, it is called an _____ reaction.
  2. 3. can be defined as either the addition of oxygen or the loss of hydrogen.
  3. 6. this substance is a chemical combination of matter that has a fixed chemical composition, definite proportions, and distinct properties.