Exam Q mistakes t2 chemistry

• Describe how sedimentation is carried out

  Put in waste water in a tank

  impurities will fall to the bottom
• In an Experiment substance y didn’t move from the start line explain a change to separate inks

  Using a different solvent

  so the ink can dissolve
• Get rf value more accurate

  Longer paper

  different material paper
• State why waste water is filtered

  To remove insoluble solids
• Explain how apparatus can be improved to increase amount of sea water collected

  Use a liebig condenser

  To increase the amount of condensation

  
• Delivery tube

  
• Water used in analysis

  • It must be pure
• In analysis, tests are carried out on solids dissolved in water.

  explIn why it’s important that the water used is pure ?

  • pure water contains no other ions or substance
  • that could give a false result
• To measure the temperature of the water vapour entering the condenser

  
• State a mistake in figure 5

  • Beaker not under the condenser exit
  • water flow in condenser is the wrong way round

  
• Explain why a condensers used

  • to cool
  • the water vapour into a liquid

  
• Give the name of alternative peices used to heat the flask

  • electric heater