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5 Written questions

5 Matching questions

  1. C
  2. Heat
  3. Sugars
  4. Exothermic
  5. The yeast acts on the sugar to form carbon dioxide & lactic acid
  1. a If endothermic reactions need more energy than they can get from their surroundings the energy must be added as _______ to cause the reaction to take place.
  2. b All combustion reactions are __________.
  3. c Why is mixing sugar,water, yeast and flour together to make bread dough a chemical reaction?
  4. d Many diffrent chemical reacitons take place inside your body _______ of the time.
    A) part B) none C) all
  5. e Plant cells store energy in the form of _________.

5 Multiple choice questions

  1. In all chemical reactions what stays the same?
  2. Chemical reactions rearange the ______ between atoms.
  3. What is a reactant?
  4. What happens to atoms in chemical reactions?
  5. How many oxygen atoms do covalent bonds hold together?

5 True/False questions

  1. From chemical reactions that change the food we eat & the oxygen we breath.What happens to the food we eat & the oxygen we breathe inside our bodies?


  2. Carbon dioxideWhen we exhale, what comes out?


  3. BreatheYou make use of oxygen, a product of photosynthesis, everytime you _______.


  4. GasolineAll of the bonds to carbon atoms are ________.


  5. you're able to see the changesDescribe the mass at the start & finish of a chemical reaction.


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