Study

Chemical Reactions

  •   0%
  •  0     0     0

  • What is formed during neutralisation?
    salt and water
  • What is the pH of an acid?
    less than 7
  • Where can enzymes be found?
    in all living things
  • Explain why increasing concentration makes a reaction faster.
    more particles, more reactions
  • What is the pH of an alkali?
    more than 7
  • What happens during neutralisation?
    acid added to alkali (vice versa) and pH moves to 7
  • What colour would universal indicator turn in alkali?
    blue/purple
  • Explain why increasing temperature makes a reaction faster.
    more energy, faster particles, more reactions
  • A reaction with concentrated acid is too fast. How could I slow it down?
    dilute the acid
  • Give me an example of a reaction where a colour change occurs.
    Making toast/frying egg etc.
  • What does an indicator do?
    Changes colour to show if a substance is acid/alkali
  • Name 2 signs of a chemical reaction
    colour change, bubbles (gas formed), precipitation (solid forming), energy change
  • A reaction at room temperature is too slow. How do I speed it up?
    Heating it
  • Name 2 ways that you can change the speed of a reaction.
    concentration, particle size, catalyst and temperature
  • What is the pH of water?
    7
  • What colour would universal indicator turn in acid?
    red/orange/yellow
  • How could you make your own indicator?
    boil cabbage
  • A reaction with lumps of calcium carbonate is too slow. How could I speed it up?
    decrease particle size
  • What is a catalyst?
    substance that can be added to a reaction to speed it up without being used up
  • What colour would universal indicator turn in a neutral substance?
    green