Recent questions in Chemistry Form 4

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A soapless detergent has the formula

asked Jun 22, 2021 in Chemistry Form 4 by anonymous

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1 answer

State one difference in the properties of potassium and sodium soaps.

asked Jun 22, 2021 in Chemistry Form 4 by anonymous

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Compound C was used to prepare a potassium soap.

asked Jun 22, 2021 in Chemistry Form 4 by anonymous

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The figure below shows part of the structure of a polymer. Give the name of the polymer.

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

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Analysis of a river water sample showed the presence of the following ions Ca2+, Na+, Cl− , NO3−.

asked Jun 22, 2021 in Chemistry Form 4 by anonymous

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Water containing hydrogen carbonate, HCO3− and calcium Ca2+ ions, is said to be hard water

asked Jun 22, 2021 in Chemistry Form 4 by anonymous

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The half-life of Th is 1.9 years. If after 5.7 years the mass of Th was found to be 1.25 g. Determine the initial mass of the radioactive isotope

asked Jun 22, 2021 in Chemistry Form 4 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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1 answer

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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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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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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1 answer

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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1 answer

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

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

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1 answer

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

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

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1 answer

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

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

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