Copper can be extracted from various sulfide minerals, including the mineral cubanite, in a multi-stage process.
A sample of cubanite has the following composition by mass:
Cu=23.4%,Fe=41.1%,S=35.5% \text{Cu} = 23.4\%, \quad \text{Fe} = 41.1\%, \quad \text{S} = 35.5\% Cu=23.4%,Fe=41.1%,S=35.5%Show by calculation that the empirical formula of this mineral is CuFe2S3\text{CuFe}_2\text{S}_3CuFe2S3. [Relative atomic masses, ArA_rAr: S=32.1\text{S} = 32.1S=32.1, Fe=55.8\text{Fe} = 55.8Fe=55.8, Cu=63.5\text{Cu} = 63.5Cu=63.5]
In one stage of titanium extraction, titanium(IV) oxide (TiO2\text{TiO}_2TiO2) is reacted with magnesium at high temperatures:
TiO2+2Mg→Ti+2MgO \text{TiO}_2 + 2\text{Mg} \rightarrow \text{Ti} + 2\text{MgO} TiO2+2Mg→Ti+2MgOExplain which element has been oxidised in this reaction.
Describe the bonding in titanium metal.
Explain why titanium metal conducts electricity.
80 exam-style questions on Edexcel IGCSE Chemistry Chemical formulae, equations and calculations. Each one has a worked solution and a mark scheme showing where the marks go.