Recent questions in Chemistry Form 3

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Give one negative effect of continuous use of nitrogenous fertilizers

asked Jul 5, 2021 in Chemistry Form 3 by anonymous

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Determine the percentage of nitrogen in ammonium nitrate fertilizer (N=14.0, H=1.0,0=16.0 )

asked Jul 5, 2021 in Chemistry Form 3 by anonymous

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Study the equation below and answer the questions that follow. C4H8 + Cl2 C4H8Cl2

asked Jul 5, 2021 in Chemistry Form 3 by anonymous

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Draw structural formulae of two positional isomers with molecular formula C4H8

asked Jul 5, 2021 in Chemistry Form 3 by anonymous

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Nitrogen (I)oxide gas can be prepared in the laboratory using a mixture of ammonium chloride solution and sodium nitrate solution.

asked Jul 5, 2021 in Chemistry Form 3 by anonymous

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Complete combustion of one mole of an alkanol, CxHyOH gave four moles of water. (C= 12.0, H = 1.0, O = 16.0)

asked Jun 22, 2021 in Chemistry Form 3 by anony mous

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A volume of sulphur IV) oxide gas diffused from an apparatus in 96 seconds. Calculate the time taken by an equal volume of carbon(IV) oxide to diffuse under the same conditions. (C = 12.0: O=16.0; S = 32.0)

asked Jun 22, 2021 in Chemistry Form 3 by anony mous

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6.2g of phosphorus was reacted with excess oxygen to form phosphorus( V) oxide. Determine the mass of the oxide formed. (0 = 16.0; P 31.0)

asked Jun 22, 2021 in Chemistry Form 3 by anony mous

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Use the information in the Table to answer the questions that follow.

asked Jun 21, 2021 in Chemistry Form 3 by anony mous

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In a certain factory, iron is extracted from the haematite ore using the blast furnace as shown in Figure 1. The other raw materials are coke, limestone and air. The melting and boiling points of iron are 1535°C and 3000 °C, respectively.

asked Jun 21, 2021 in Chemistry Form 3 by anonymous

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Some compounds such as CFCs and DDT are regarded as environmental pollutants. Give the complete names of

asked Jun 21, 2021 in Chemistry Form 3 by anony mous

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A factory uses 100 kg of ammonia each day to produce 160 kg of nitrogen(II) oxide. Calculate the percentage yield of nitrogen(II) oxide.

asked Jun 21, 2021 in Chemistry Form 3 by anonymous

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In the laboratory, methane can be prepared from salts of alkanoic acids. Describe how methane is prepared from sodium ethanoate.

asked Jun 21, 2021 in Chemistry Form 3 by anonymous

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The main component in natural gas is methane. Describe how methane in natural gas is formed.

asked Jun 21, 2021 in Chemistry Form 3 by anonymous

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Incomplete combustion of pentane may result in air pollution. Write an equation to illustrate this combustion.

asked Jun 21, 2021 in Chemistry Form 3 by anonymous

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Draw and name two isomers of pentane

asked Jun 21, 2021 in Chemistry Form 3 by anonymous

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Crude oil is a mixture of hydrocarbons which are separated by fractional distillation. One of the components obtained contains an alkane A, with eleven carbon atoms.

asked Jun 21, 2021 in Chemistry Form 3 by anonymous

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Nitrogen(IV) oxide is prepared by heating lead(ll) nitrate.

asked Jun 21, 2021 in Chemistry Form 3 by anony mous

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The Figure below shows a reaction scheme starting with copper turnings. Study it and answer the questions that follow

asked Jun 21, 2021 in Chemistry Form 3 by anony mous

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The table shows pH values of solutions of compounds D, E. F and G

asked Jun 21, 2021 in Chemistry Form 3 by anony mous

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