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5 Written questions

5 Matching questions

  1. They are rearranged
  2. they undergo chemical reactions and change form
  3. They are the same types of atoms but the bonds between them are rearranged
  4. Equal
  5. body
  1. a What happens to atoms in chemical reactions?
  2. b Chemical reactions can take place in your?
  3. c The total amount of energy from the products must _______ the amount of energy of the reactants & their surroundings.
  4. d What happens to the food we eat & the oxygen we breathe inside our bodies?
  5. e Describe the atoms that are found in the products & reactants of a reaction.

5 Multiple choice questions

  1. 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. What do plants use to convert carbon dioxide & water into glucose & oxygen?
  3. Why is mixing sugar,water, yeast and flour together to make bread dough a chemical reaction?
  4. What is a reactant?
  5. What words describe chemical reactions that you see everyday?

5 True/False questions

  1. TrueTRUE/FALSE?
    Sometimes, endothermic reactions need more energy than they can get from their surroundings?

          

  2. EnergyFor all atoms in isooctane & oxygen to react, all of the bonds must do what?

          

  3. BondsChemical reactions rearange the ______ between atoms.

          

  4. When the original substances go through chemical changes and form new substances.What happens to the food we eat & the oxygen we breathe inside our bodies?

          

  5. Carbon dioxideWhen we exhale, what comes out?

          

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