Month: August 2022

Kenya Certificate of Secondary Education 2017 Chemistry paper 1 1. Table 1 shows the atomic numbers and the first ionisation energies of three elements. The letters are not actual symbols of the elements. Use it to answer the questions that… Read More

Practical 2018 Chemistry paper 3 1. You are provided with: • 0.30 g solid A, magnesium metal • Hydrochloric acid, solution B • 0.15 sodium carbonate, solution C • Methyl orange indicator You are required to determine the: • Enthalpy… Read More

2018 Chemistry paper 2 1. The diagram in figure I shows some natural and industrial processes. Study it and answer the questions that follows (a) Identify the processes labelled: (2 marks) A — Fermentation B — Dehydration C — Addition… Read More

2018 Chemistry paper 2 1. The diagram in figure I shows some natural and industrial processes. Study it and answer the questions that follows (a) Identify the processes labelled: (2 marks) A………………. B………………. C………………. D………………. (b) State the reagents and… Read More

2018 Chemistry paper 1 1. (a) Define a soluble base. (1 mark) A soluble base is a substance that dissociates in water to produce hydroxide ions as the only negative ions. (b) Aqueous solutions of 2M ethanoic acid and 2M… Read More

 Biology Paper 2 Answer all the questions in the spaces provided. 1. In an experiment to investigate the effect of Sodium chloride on the growth rate in a spinach seedling. seeds were treated with different of sodium chloride. The results… Read More

 Chemistry paper 1 1. An atom of element A has mass number 39 and 19 protons. (a) Write the electron arrangements of the atom (1 mark)   2.8.8.1(b) State the period and group to which element A belongs Group 1(½ mark)… Read More

2020 Chemistry paper 2

 Chemistry Paper 3 (233/3) 1 You are provided with: – 1.6Og of solid A. a dibasic acid. – Solution B containing 4.75g per litre of salt B. – Aqueous sodium hydroxide. solution C. – Phenolphthalein indicator. You are required to… Read More

Chemistry Paper 2 (233/2) 1 The flow chart below shows some of the processes involved in large scale production of sulphuric (VI) acid. Use it to answer the questions that follow. (a) Describe how oxygen is obtained from air on… Read More