6.4. Redox
A subsection of Chemistry, 0620, through 6. Chemical reactions
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When magnesium nitrate is heated strongly, magnesium oxide is formed. The equation for this reaction is shown. 2Mg(NO3)2 → 2MgO + 4NO2 + O2 State the change in oxidation number of nitrogen, N, in this reaction. from to Identify the element which is oxidised in this reaction. Calculate the volume of NO2 gas, at r.t.p., formed when 7.40 g of Mg(NO3)2 is heated. Use the following steps. ● Calculate the Mr of Mg(NO3)2. ● Calculate the number of moles of Mg(NO3)2 used. mol ● Determine the number of moles of NO2 formed. mol ● Calculate the volume of NO2 gas, in cm3, at r.t.p. cm3 Magnesium oxide, MgO, is an ionic compound. Complete the dot-and-cross diagram in of the ions in magnesium oxide. Give the charges on each of the ions. Mg O Oxygen is a covalent molecule. Complete the dot-and-cross diagram in of a molecule of oxygen. The inner shells have been drawn. O O
0620_w24_qp_41
THEORY
2024
Paper 4, Variant 1
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