Recent questions in Chemistry

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1 answer

A compound W consist of 26.7%carbon, 2.2% hydrogen and the rest oxygen. It has a relative formula Mass of 90(C=12, H=1, O=16,)

asked Aug 18, 2021 in Chemistry Form 3 by anony mous

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1 answer

Explain the following observations

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

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1 answer

Draw a dot (.) and cross (X) diagram to show the bonding in the molecules of : (Atomic number of carbon is 6, Oxygen is 8 and hydrogen is 1)

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

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1 answer

The diagram below represents a luminous flame. disgram of luminous flame Mark and label on the diagram the hottest and coolest parts

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

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1 answer

A fixed mass of a gas has a volume of 200cm3 at a temperature of 47°C and 750mmHg. Calculate the volume the gas would occupy at 7°C and 750mmHg pressure.

asked Aug 18, 2021 in Chemistry Form 3 by anony mous

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1 answer

Element J belong to period 3 and group V.

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

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1 answer

A student prepared ammonia gas and wanted to make a solution in water. Complete the diagram to show how he made the solution.

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

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1 answer

Classify the changes below as physical or chemical changes.

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

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1 answer

The table below shows the atomic numbers of elements F G and H.

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

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1 answer

Name the two allotropes of sulphur.

asked Aug 18, 2021 in Chemistry Form 3 by anony mous

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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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