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Chemical Reactions

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    Chemical reactions
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  • What type of change occurs when ice melts?
    Physical
  •  5
  • What type of change occurs when paper burns?
    Chemical
  •  5
  • What name is given to substances at the start of a reaction?
    reactant
  •  10
  • What name is given to substances at the end of a reaction?
    products
  •  15
  • What word means "the new substances formed in a chemical change"?
    products
  •  15
  • What symbol is used in equations to mean “yields” or “produces”?
    → (Arrow)
  •  15
  • Who discovered the law of conservation of mass?
    Lavoisier
  •  25
  • What does the word conservation mean?
    Staying the same
  •  20
  • What law states that mass is neither created nor destroyed in a reaction?
    Conservation (of Mass)
  •  15
  • What type of equation shows equal numbers of each atom on both sides?
    Balanced
  •  15
  • What element reacts with hydrogen to make water?
    Oxygen
  •  15
  • What small particle theory is used to explain conservation of mass?
    Particle
  •  15
  • What type of change is usually easy to reverse?
    Physical
  •  15
  • What type of change is usually hard to reverse?
    Chemical
  •  15
  • What process produces rust?
    Oxidation
  •  15
  • What form of energy is often released in chemical reactions?
    Heat
  •  15