Chemical Reactions

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Across
  1. 2. A substance that is made up of two or more different elements chemically bonded together.
  2. 4. A reaction where a substance combines with oxygen, often releasing energy.
  3. 6. A substance made of only one type of atom.
  4. 8. A reaction that absorbs energy from the surroundings.
  5. 10. A reaction that releases energy in the form of heat.
Down
  1. 1. A reaction where two or more substances combine to form a new compound.
  2. 3. A substance that is produced in a chemical reaction.
  3. 5. A substance that is present at the start of a chemical reaction.
  4. 7. replacement A reaction where one element replaces another in a compound.
  5. 9. A reaction where a compound breaks down into two or more simpler substances.