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Paper 1 H - SAMPLE SET 1 Q2

2) Figure 2 shows a reactor used to produce titanium from titanium(IV) chloride.
Picture
The chemical equation for the reaction of titanium(IV) chloride with sodium is:
Picture
For one reaction:
• 1615 kg titanium(IV) chloride reacted completely with 782 kg sodium
• 1989 kg sodium chloride was produced.
Calculate the mass of titanium produced from this reaction. [1 mark]

Mass of titanium = ________________________ kg

2.2) Table 1 shows the solubility of sodium chloride in 100 cm3 of aqueous solution at different temperatures.
Picture
On Figure 3:
• plot this data on the grid
• draw a line of best fit. [3 marks]
Picture
2.3) The product sodium chloride is dissolved in water to separate it from titanium.
At 30 °C the solubility of sodium chloride is 36 kg per 100 dm3.
Calculate the minimum volume of water in dm3, at 30 °C, needed to dissolve 1989 kg sodium chloride. [2 marks]

Volume of water = ____________________ dm3

2.4)Calculate the percentage by mass of titanium in titanium(IV) chloride (TiCl4).
Give your answer to 3 significant figures.
Relative atomic masses (Ar): Cl = 35.5; Ti = 48 [3 marks]

Percentage of titanium by mass = _________ %

2.5) Suggest why the reaction is done in an atmosphere of dry argon instead of air containing water vapour. [3 marks]

2.6)Explain why titanium conducts electricity. [3 marks]

​​​​(Total for Question 2 = 15 marks)

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