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5 Written questions

5 Matching questions

  1. Closed System
  2. Synthesis
  3. Fuel
  4. Combustion
  5. Chemical Property
  1. a A chemical reaction in which two or more simple substances combine to form a new, more complex substance
  2. b A characteristic of a pure substance that describes its ability to change into a different substance
  3. c A system in which no matter is allowed to enter or leave
  4. d A rapid reaction between oxygen and fuel that results in a fire
  5. e A material that releases energy when it burns

5 Multiple choice questions

  1. A chemical reaction that breaks down compounds into simpler products
  2. A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in the reaction
  3. A material that increases the rate of a reaction by lowering the activation energy
  4. A characteristic of a pure substance that can be observed without changing it into another substance
  5. A system in which matter can enter from or escape to the surrounding

5 True/False questions

  1. Exothermic ReactionA reaction that releases energy in the form of heat


  2. EnzymeA biological catalyst that lowers the activation energy of reactions in cells


  3. Physical ChangeA change in a substance that does not change its identity


  4. InhibitorThe study of the properties of matter and how matter changes


  5. ProductA material that releases energy when it burns