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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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Consider the following reaction. H2S+Cl2 →2HCI+S

asked Jun 22, 2021 in Chemistry Form 2 by anony mous

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The table gives standard reduction potentials for some half cells.

asked Jun 22, 2021 in Chemistry Form 4 by anonymous

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State one factor that affects the preferential discharge of ions at the cathode

asked Jun 22, 2021 in Chemistry Form 4 by anony mous

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Salts may be classified as soluble or insoluble. Select from the following list a pair of compounds that can be used to prepare a soluble and an insoluble salt

asked Jun 22, 2021 in Chemistry Form 2 by anony mous

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The table shows the elements in period 3 of the periodic table. Study it and answer the questions that follow.

asked Jun 22, 2021 in Chemistry Form 4 by anonymous

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Compound V reacts with water as shown in the following equation. V+H2O → CH3CH2CH2OH

asked Jun 22, 2021 in Chemistry Form 2 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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Outline the differences between Quran and Hadith Qudsi

asked Jun 21, 2021 in IRE Form 3 by Mohammed hamoud

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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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One of the ores of iron is haematite, Fe2O3. Give the name and formula of two other ores of iron.

asked Jun 21, 2021 in Chemistry Form 4 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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Methane reacts with bromine as shown in the following equation. CH4(g) + Br2(g) → CH3Br(g) + HBr(g) Using the bond energies in the Table, calculate the enthalpy change, ΔH for the reaction.

asked Jun 21, 2021 in Chemistry Form 4 by anony mous

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One of the reactions in the manufacture of nitric(V) acid involves catalytic oxidation of ammonia as shown in the equation.

asked Jun 21, 2021 in Chemistry Form 4 by anonymous

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Dichromate(VI) ions are orange in colour while chromate(VI) ions are yellow. Consider the following equilibrium.

asked Jun 21, 2021 in Chemistry Form 4 by anonymous

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State what is meant by the term 'dynamic equilibrium.

asked Jun 21, 2021 in Chemistry Form 1 by anonymous

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peroxide decomposition Sodium carbonate is prepared on large scale by the Solvay process. The equation for the main reaction that takes place in the carbonator is: NaCl(aq) + NH3(g) + CO2(g)+ H2O(l) → NH4Cl(aq) + NaHCO3(s)

asked Jun 21, 2021 in Chemistry Form 2 by anony mous

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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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