Recent questions without a selected answer

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1 answer

Distinguish between allotropes and isotopes.

asked Aug 18, 2021 in Chemistry Form 2 by anony mous

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1 answer

Dyes W,X, Y and Z were analysed using P as the purest sample of the dye required by a chemist .the result obtained were as shown on the chromatogram below.

asked Aug 18, 2021 in Chemistry Form 1 by anony mous

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1 answer

The flow chart below shows the large scale manufacture of ammonia gas and some ammonium compounds. Study it and answer the questions that follow.

asked Aug 17, 2021 in Chemistry Form 2 by anonymous

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8 answers

Give two reasons why wood and charcoal are chosen for domestic heating.

asked Aug 17, 2021 in Chemistry Form 4 by anonymous

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1 answer

Define heat value of a fuel.

asked Aug 17, 2021 in Chemistry Form 4 by anonymous

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2 answers

The diagram below shows an energy level diagram for the formation of magnesium chloride. Study it and answer the questions that follow.

asked Aug 17, 2021 in Chemistry Form 4 by anonymous

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1 answer

Distinguish between hydration energy and lattice energy.

asked Aug 17, 2021 in Chemistry Form 4 by anonymous

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1 answer

Use the following information to answer the questions that follow:

asked Aug 17, 2021 in Chemistry Form 3 by anonymous

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5 answers

State Hess’s law.

asked Aug 17, 2021 in Chemistry Form 4 by anonymous

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1 answer

During electrolysis of aqueous copper (II) sulphate using copper electrodes a current of 0.2 amperes was passed through the cell for 5 hours. Determine the change in mass of the cathode that occurred as a result of the electrolysis process. (Cu = 64, IF = 96500 coulombs).

asked Aug 17, 2021 in Chemistry Form 4 by anonymous

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2 answers

Aqueous copper (II) sulphate was electrolysed using the set up below.

asked Aug 17, 2021 in Chemistry Form 4 by anonymous

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3 answers

Use the standard electrode potentials for elements A, B, C, D and F given below to answer the questions that follow.

asked Aug 17, 2021 in Chemistry Form 4 by anonymous

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1 answer

When bromine is dissolved in water the equilibrium shown below is established.

asked Aug 17, 2021 in Chemistry Form 4 by anonymous

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1 answer

An organic compound J has the following percentage by mass, carbon 64.86%, hydrogen 13.51% and the rest is oxygen. The relative molecular mass of the compound is 74. C = 12, O = 16, H = 1)

asked Aug 17, 2021 in Chemistry Form 3 by anonymous

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1 answer

Cracking can also be achieved using less amount of heat in the presence of a catalyst. Name one catalyst that is often used.

asked Aug 17, 2021 in Chemistry Form 3 by anonymous

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1 answer

One mole of heptane was thermally cracked, two hydrocarbons Q and P were formed. Q was an alkene molecule with three carbon atoms.

asked Aug 17, 2021 in Chemistry Form 1 by anonymous

0 votes

1 answer

Sodium metal reacts with air to form two oxides. Give the formulae of the oxides.

asked Aug 17, 2021 in Chemistry Form 3 by anonymous

0 votes

1 answer

Explain why aqueous sodium chloride is not suitable as an electrolyte for the manufacture of sodium in the Downs process.

asked Aug 17, 2021 in Chemistry Form 4 by anonymous

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1 answer

Below is a simplified diagram of the Down’s cell used for the manufacture of sodium. Study it and answer the questions that follow.

asked Aug 17, 2021 in Chemistry Form 4 by anonymous

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1 answer

Study the information below and answer the questions that follow. The letters do not represent the actual symbols of the elements.

asked Aug 17, 2021 in Chemistry Form 2 by anonymous

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