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5 Written questions

5 Matching questions

  1. Bonds
  2. When the original substances go through chemical changes and form new substances.
  3. grow, ripen, decay, burn
  4. Exothermic reaction
  5. Formation of a gas
    formation of a solid
    release of energy
  1. a What are some easily visible signs of chemical reactions?
  2. b A chemical reaction in which energy is released to the surroundings as heat is called ________________.
  3. c With regards to the reactants, how do you know when a chemical reaction has occured.
  4. d Chemical reactions rearange the ______ between atoms.
  5. e What words describe chemical reactions that you see everyday?

5 Multiple choice questions

  1. What is energy that is stored in the form of chemical bonds?
  2. What can be used to break bonds?
  3. When we exhale, what comes out?
  4. 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.
  5. In all chemical reactions what stays the same?

5 True/False questions

  1. Break bondsMany forms of energy can be used to ___________.

          

  2. energyIn all exothermic reactions, do products have more or less energy that the reactants?

          

  3. EqualIf 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.

          

  4. bodyChemical reactions can take place in your?

          

  5. a substance that participates in a chemical reactionWhat is a reactant?