CIE Jun 2016 v1 Paper 2 Q3

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The elements in Group 2, and their compounds, show many similarities and trends in their properties. PMT (a) Magnesium, calcium, strontium and barium all react with cold water. (i) Describe what you would see when some calcium is added to cold water.[3] (ii) Write an equation for the reaction taking place in (i).[1] (iii) Describe how the reaction of barium with cold water would differ from the reaction of calcium in (i) in terms of what you would see.[1] (b) Magnesium oxide can be formed by the reaction of magnesium and oxygen in the air. (i) Draw a fully labelled reaction pathway diagram for the reaction between magnesium and oxygen. energy reaction pathway [2] (ii) Explain why there is no visible reaction when a piece of magnesium ribbon is exposed to the air.[2]UCLES 2016 9701/21/M/J/16<br /> PMT (iii) Magnesium oxide is used to manufacture heat-resistant bricks for furnace linings in the steel-making industry. State and explain the property of magnesium oxide that makes it suitable for this use.[2] (iv) Suggest a reason why magnesium oxide cannot be used as a lining for any furnaces containing acidic materials.[1] (c) The nitrates and carbonates of the Group 2 elements, from magnesium to barium, decompose when heated. (i) State the trend in the temperature of thermal decomposition of these Group 2 nitrates and carbonates.[1] (ii) Give the equation for the thermal decomposition of magnesium carbonate.[1] (iii) Give the equation for the thermal decomposition of calcium nitrate.[1] [Total: 15]UCLES 2016 9701/21/M/J/16 [Turn over<br />

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