CANDIDATES’ STRENGTHS
Candidates’ were able to:
- List five steps in the treatment of water for town supply;
- Write the electron configuration of the elements listed;
- Calculate the number of moles of hydrogen ions in 1 dm3 of a 0.1 mol dm-3
- Tetraoxosulphate (VI) acid solution;
- Draw the structures of two isomers of butene;
- State the IUPAC name of the isomers drawn in 3(a)(i);
- Describe a chemical test for CO2;
- State two conditions necessary for a high yield of ammonia;
- Give two uses of ammonia;
- List the major product(s) formed when carbon is burnt in limited air;
- State the method of collecting gases which are denser than air;
- Suggest two ways of reducing air pollution in our cities;
- Mention one source of water pollution.