science definitions

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Across
  1. 2. change in which the form of matter is altered but one substance is not transformed into another
  2. 3. a process or chemical reaction characterized by or causing the liberation or release of heat
  3. 4. change usually irreversible reaction involving the rearrangement of the atom
  4. 6. a chemical reaction which an acid and a base react to form salt
  5. 7. is a substance that is formed when two or more chemical react
  6. 8. the smallest particle of a chemical element that can exist
  7. 9. a chemical reaction that occurs between a fuel and an oxidizing agent that produces energy, usually form heat and light
Down
  1. 1. chemical reaction that is accompanied by absorption of heat ,or and organism that generation heat to maintain its temperature
  2. 2. is the creation of a solid form a solution
  3. 5. a chemical substance that is present at the start of a chemical reaction