Questions by anonymous

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Metal R does not react with an oxide of metal S. Metal T reacts with an oxide of metal S. metal Q reacts with an oxide of T. Arrange the metals in increasing order of reactivity.

asked Jul 27, 2021 in Chemistry Form 4

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The table below shows isotopes and their percentage abundances.

asked Jul 27, 2021 in Chemistry Form 4

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When a mixture of iron filings and sulphur are heated, a red glow spreads through the mixture and a dark grey solid was formed.

asked Jul 27, 2021 in Chemistry Form 3

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The diagram below represents a charcoal burner. Study it and answer the questions that follow;

asked Jul 27, 2021 in Chemistry Form 2

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Classify the following processes as either chemical or physical.

asked Jul 27, 2021 in Chemistry Form 4

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The molar mass of a gaseous compound XO2 is 64 gmol-1. A sample of this gas occupied 11.2dm3 at s.t.p.molar gas volume =22.4dm3.find

asked Jul 27, 2021 in Chemistry Form 3

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Explain how the following substances conduct an electric current.

asked Jul 27, 2021 in Chemistry Form 4

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2 answers

Give two products formed when a candle burns.

asked Jul 27, 2021 in Chemistry Form 1

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200cm3 of oxygen gas take 250seconds to diffuse through a porous plug. Under similar conditions, an equal volume of an unknown gas take 277 seconds to diffuse through the same porous plug. Calculate the relative molecular mass of the unknown gas.

asked Jul 27, 2021 in Chemistry Form 3

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State Graham’s Law of diffusion.

asked Jul 27, 2021 in Chemistry Form 3

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2 answers

Using dot (.) and cross (x) diagram, show bonding in the compound Ammonium ion (NH+4).(N= 14, H = 1)

asked Jul 27, 2021 in Chemistry Form 2

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A seed catalogue that the preferred soil pH range for the growth of different varieties of a crop are as shown in the table.

asked Jul 27, 2021 in Chemistry Form 1

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During heating of hydrated copper (II) sulphate crystals, the following readings were obtained:-

asked Jul 27, 2021 in Chemistry Form 3

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1 answer

Silver chloride can be prepared in the laboratory by the reaction between potassium chloride and silver nitrate.

asked Jul 27, 2021 in Chemistry Form 3

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1 answer

Equal volumes of water put in 100cm3 glass beaker and heated for 5 minutes using Bunsen flames. It was observed that water in beaker A registered higher temperature than beaker B.

asked Jul 27, 2021 in Chemistry Form 1

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1 answer

When 5.35g of Sodium Nitrate were heated in an open crucible, the mass of oxygen produced was 0.83g. given that the equation for the reaction is:-

asked Jul 27, 2021 in Chemistry Form 3

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2 answers

Study the table below and answer the questions that follow:-

asked Jul 27, 2021 in Chemistry Form 2

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1 answer

State one application of fractional distillation.

asked Jul 27, 2021 in Chemistry Form 1

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What role do the following parts play during fractional distillation of water and ethanol?

asked Jul 27, 2021 in Chemistry Form 1

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1 answer

Toa sababu sita za kudidimia kwa fasihi simulizi.

asked Jul 23, 2021 in Fasihi

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