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18. Acids, bases and salts Questions and Answers

Acids, bases and salts Questions1. Study the reaction below and answer the questions that followNH3 (g) + H2O (l) NH4+ (aq) + OH–(aq) (a) Define

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22. Metals Questions and Answers

Metals Questions1.  The following diagram represents extraction of sodium by the Down’s cell   (a) Why is the anode made of graphite in this case instead

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4. Air and combustion Questions and Answers

Air and combustion Questions  1. The set-up below was used to prepare a sample of oxygen gas. Study it and answer the questions that follow. 

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23. Organic chemistry II (alkanoic acids and alkanols) Questions and Answers

Organic chemistry II (alkanoic acids and alkanols) Questions1. A student mixed equal volumes of Ethanol and butanoic acid. He added a few drops of concentrated

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9. Salts Questions and Answers

Salts Questions1.  Study the flow chart below and answer the questions that follow:     a) Name reagent Z.    b) Describe the process which takes

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5. Water and hydrogen Questions and Answers

5. Water and hydrogen Questions1.  (a) Hydrogen can reduce coppers Oxide but not alluminium oxide. Explain    (b) When water reacts with potassium metal the

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21. Electrochemistry Questions and Answers

Electrochemistry Questions1.  The setup below was used to carry out the electrolysis of Magnesium sulphate solution using inert electrodes.    (i) Name a suitable pair

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20. Reaction rates and reversible reactions and Answers

Reaction rates and reversible reactions1.   Study the following equilibrium reaction and answer the questions that follow:- HL(aq) + H2O(l)   H3O+(aq) L–(aq)   Given that

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7. Chemical families Questions and Answers

Chemical families Questions1.  Study the information in the table below and answer the questions that follow: Element Atomic radius (nm)Ionic radius (nm)W0.1140.195X0.0720.136Y0.1330.216Z0.0990.181  (a) Would these

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16. Sulphur and its compounds Questions and Answers

Sulphur and its compounds Questions1. Sulphur is extracted from underground deposits by a process in which three concentric pipes are sunk down to the deposits

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13. The mole Questions and Answers

The mole Questions1.  In an experiment magnesium ribbon was heated in air. The product formed was found to be  heavier than the original ribbon. Potassium

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12. Gas laws Questions and Answers

Gas laws Questions1. A sample of unknown compound gas X is shown by analysis to contain Sulphur and Oxygen. The gas requires 28.3 seconds to

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KCSE Chemistry Form Three Notes

· Chemistry Form 3 Notes : THE MOLE – Introduction to the mole, molar masses and Relative atomic masses· Chemistry Form 3: Gas laws· Chemistry

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17. Chlorine and its compounds Questions and Answers

Chlorine and its compounds Questions1. (i) State one observation made in this experiment   (ii) Identify the substances formed in the above reaction2.  Hydrogen chloride

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14. Organic chemistry 1 Questions and Answers

Organic chemistry 1 Questions1.  Use the flow chart below to answer the questions that follow:                   (a) What observation would

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2. Simple classification of substances Questions and Answers

Simple classification of substances Questions1.  The diagram below shows the heating curve of a pure substance. Study it and answer the   questions that follow: