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Simple chemical reaction

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  • Why are chemical reactions useful?
    They help make new substance or materials.
  • Why is rusting irreversible?
    A new substance is formed
  • Metal + acid -------------> what product?
    Salt + hydrogen gas
  • What happens when magnesium reacts with acid?
    Magnesium chloride and hydrogen gas
  • Is colour a physical or chemical property?
    Physical property
  • What sound confirms hydrogen?
    A squeaky pop
  • Name one chemical property?
    Reacts with water/ react with acid/.....
  • What are products?
    New substances formed after a reaction
  • Name one sign of a chemical reaction
  • What gas is produced when metals react with acids?
    Hydrogen gas
  • What is physical properties?
    Things you can observe without changing the substance
  • What are reactants?
    Substances present at the start of a reaction
  • How do you test for hydrogen gas??
    With a ligeted splint
  • Which change forms new substances?
    Chemical change
  • Why is potassium stored under oil?
    To stop it reacting with air and water(water vapour)
  • What is chemical change?
    A change that forms new substances
  • What type of change is copper turning green?
    Chemical change
  • What is physical change?
    A change where no new substance is formed/ often reversible/ only physical properties change
  • Name one physical property
    Colour/ shape/ state/ density
  • What is produced when potassium reacts with water?
    Hydrogen gas and heat
  • What are bubbles during a reaction a sign of?
    Gas being produced.
  • Is reacting with acid a chemical property?
    yes
  • What does 'reactive' mean?
    How easily a substance reacts.
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