Answers 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)

answered Jun 22, 2021 in Chemistry Form 3

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

answered Jun 22, 2021 in Chemistry Form 2

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

answered Jun 22, 2021 in Chemistry Form 4

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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

answered Jun 22, 2021 in Chemistry Form 2

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

answered Jun 22, 2021 in Chemistry Form 2

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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)

answered Jun 22, 2021 in Chemistry Form 3

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Draw a labelled diagram of the setup of apparatus that can be used to electrolyse lead (ll) bromide.

answered Jun 21, 2021 in Chemistry Form 4

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

answered Jun 21, 2021 in Chemistry Form 3

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

answered Jun 21, 2021 in Chemistry Form 3

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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.

answered Jun 21, 2021 in Chemistry Form 4

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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)

answered Jun 21, 2021 in Chemistry Form 2

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The Figure shows an energy level diagram for the decomposition of hydrogen peroxide using a catalyst

answered Jun 21, 2021 in Chemistry Form 4

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

answered Jun 21, 2021 in Chemistry Form 3

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Study the information in the table and answer the questions that follow. The elements belong to the same chemical family. (The letters are not actual symbols of the elements)

answered Jun 21, 2021 in Chemistry Form 2

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Excess dilute hydrochloric acid was added to an alloy of copper and zinc in a beaker.

answered Jun 21, 2021 in Chemistry Form 4

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When chlorine is bubbled through hot concentrated sodium hydroxide solution, sodium chlorate(V), sodium chloride and water are formed.

answered Jun 21, 2021 in Chemistry Form 2

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

answered Jun 21, 2021 in Chemistry Form 3

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State the difference between a covalent bond and a dative covalent bond.

answered Jun 21, 2021 in Chemistry Form 2

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

answered Jun 21, 2021 in Chemistry Form 3

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Draw the structural formula of 2-methylbut-2-ene.

answered Jun 21, 2021 in Chemistry Form 3

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