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9.1. Periodicity of physical properties of the elements in Period 3
A subsection of Chemistry, 9701, through 9. The Periodic Table: chemical periodicity
Listing 10 of 59 questions
State how the melting point and density of iron compare to those of calcium. melting point of iron: density of iron: Explain why these differences occur. melting point: density: The following diagram shows the apparatus used to measure the standard electrode potential, E o, of a cell composed of a Cu(/ Cu electrode and an Fe(/ Fe electrode. Finish the diagram by adding components to show the complete circuit. Label the components you add. A C B D In the spaces below, identify or describe what the four letters A-D represent. A B C D Use the Data Booklet to calculate the E o for this cell. Predict how the size of the overall cell potential would change, if at all, as the concentration of solution C is increased. Explain your reasoning. The iron(complex ferrous bisglycinate hydrochloride is sometimes prescribed, in capsule form, to treat iron defi ciency or anaemia. A capsule containing 500 mg of this iron(complex was dissolved in dilute H2SO4 and titrated with 0.0200 mol dm–3 KMnO4. 18.1 cm3 of KMnO4 solution were required to reach the end point. The equation for the titration reaction is as follows. 5Fe2+ + MnO4 – + 8H+  5Fe3+ + Mn2+ + 4H2O Describe how you would recognise the end point of this titration. Calculate ● the number of moles of Fe2+ in the capsule, ● the mass of iron in the capsule, ● the molar mass of the iron(complex, assuming 1 mol of the complex contains 1 mol of iron.
9701_s14_qp_41
THEORY
2014
Paper 4, Variant 1
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State how the melting point and density of iron compare to those of calcium. melting point of iron: density of iron: Explain why these differences occur. melting point: density: The following diagram shows the apparatus used to measure the standard electrode potential, E o, of a cell composed of a Cu(/ Cu electrode and an Fe(/ Fe electrode. Finish the diagram by adding components to show the complete circuit. Label the components you add. A C B D In the spaces below, identify or describe what the four letters A-D represent. A B C D Use the Data Booklet to calculate the E o for this cell. Predict how the size of the overall cell potential would change, if at all, as the concentration of solution C is increased. Explain your reasoning. The iron(complex ferrous bisglycinate hydrochloride is sometimes prescribed, in capsule form, to treat iron defi ciency or anaemia. A capsule containing 500 mg of this iron(complex was dissolved in dilute H2SO4 and titrated with 0.0200 mol dm–3 KMnO4. 18.1 cm3 of KMnO4 solution were required to reach the end point. The equation for the titration reaction is as follows. 5Fe2+ + MnO4 – + 8H+  5Fe3+ + Mn2+ + 4H2O Describe how you would recognise the end point of this titration. Calculate ● the number of moles of Fe2+ in the capsule, ● the mass of iron in the capsule, ● the molar mass of the iron(complex, assuming 1 mol of the complex contains 1 mol of iron.
9701_s14_qp_43
THEORY
2014
Paper 4, Variant 3
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Questions Discovered
59