Acids & Alkalis - Chemistry

• What do you use to test wheather a substance is acid, alkali or neutral?


  You use indicators
• What is the most commonly used indicator?

  Universal indicator
• What colour is a strong acid on the ph scale?


  red
• What colour is a strong alkali on the ph scale?


  dark blue/purple
• What colour is a weak acid on the ph scale?

  orange-yellow
• What colour is a weak alkali on the ph scale?


  light blue
• What colour is a neutral on the ph scale?


  green
• How many numbers are there in the ph scale?

  14
• What is neutralisation?


  the reaction between an acid and an alkali where the combined solution is neutral
• What is an exothermic reaction?


  A reaction where energy is emitted as heat
• Acid + alkali =

  salt + water
• How do you test for hydrogen?

  You will hear a squeaky pop when a burning splint is held over the open end of a test tube containing hydrogen
• How do you test for oxygen?

  If you put a glowing splint inside a test tube containing oxygen, the oxygen will relight it
• How do you test for Carbon Dioxide?

  it turns limewater cloudy
• What is filtration?


  the process of separating solid particles (that are insoluble) from a liquid
• What is evaporation?


  Separating a substance which has dissolved in water by turning the water into a gas (water vapour)
• What is distillation?


  separates liquids with different boiling points
• What is chromatography?


  A process of separating components of a mixture