Figure 13 shows a model of how particles are arranged in a solid.
Figure 13
(2)
Explain why magnesium oxide has such a high melting point.
(3)
Write the balanced equation for this reaction.
(3)
The thermal decomposition of copper carbonate forms copper oxide and carbon dioxide.
CuCO3(s) → CuO(s) + CO2(g)
15.0 g of pure copper carbonate is decomposed completely.
Calculate the mass of solid produced.
(relative atomic masses: C = 12.0; O = 16.0; Cu = 63.5)
Give your answer to two significant figures.
(2)
mass of solid = ................................................................. g
Higher Only
Magnesium reacts with water in the form of steam as shown in the equation.
Mg + 2H2O → Mg(OH)2+ H2
2.4 g of magnesium reacts with sufficient steam for a complete reaction to form 5.8 g of magnesium hydroxide and 0.2 g of hydrogen.
Show, by calculation, that the law of conservation of mass applies to this reaction.
(relative atomic masses: H = 1.0, O = 16, Mg = 24)
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