IGCSE Chemistry Edexcel 4CH1

2: (h) Chemical tests

#2.44

describe tests for these gases:

  • hydrogen
  • oxygen
  • carbon dioxide
  • ammonia
  • chlorine.
#2.45

describe how to carry out a flame test

#2.46

know the colours formed in flame tests for these cations:

  • Li+ is red
  • Na+ is yellow
  • K+ is lilac
  • Ca2+ is orange-red
  • Cu2+ is blue-green.
#2.47

describe tests for these cations:

  • NH4+ using sodium hydroxide solution and identifying the gas evolved
  • Cu2+, Fe2+ and Fe3+ using sodium hydroxide solution.
#2.48

describe tests for these anions:

  • Cl–, Br– and I– using acidified silver nitrate solution
  • SO42– using acidified barium chloride solution
  • CO32– using hydrochloric acid and identifying the gas evolved.
#2.49

describe a test for the presence of water using anhydrous copper (II) sulfate

#2.50

describe a physical test to show whether a sample of water is pure

2
(g) Acids, bases and salt preparations
3
(a) Energetics
Back to the Topics page