GCSE COMBINED SCIENCE: TRILOGY Foundation Tier Chemistry Paper 2F

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Information • The maximum mark for this paper is 70. • The marks for questions are shown in brackets. • You are expected to use a calculator where appropriate. • You are reminded of the ne... ed for good English and clear presentation in your answers. Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature I declare this is my own work. GCSE COMBINED SCIENCE: TRILOGY Foundation Tier Chemistry Paper 2F F2 *02* IB/M/Jun21/8464/C/2F 0 1 Fresh water contains low levels of dissolved salts. Water reacts with anhydrous copper sulfate in a reversible reaction. The word equation for the reaction is: water + anhydrous copper sulfate ⇌ hydrated copper sulfate 0 1 . 1 How does the equation show that the reaction is reversible? [1 mark] 0 1 . 2 Complete the sentences. Choose answers from the box. [2 marks] blue green orange white yellow The colour of anhydrous copper sulfate is . The colour of hydrated copper sulfate is . Do not write outside the box3 *03* Turn over ► IB/M/Jun21/8464/C/2F Do not write outside the 0 1 . 3 Figure 1 shows anhydrous copper sulfate in a sealed container. box Figure 1 Suggest one reason why anhydrous copper sulfate is kept in a sealed container. [1 mark] Question 1 continues on the next page4 *04* IB/M/Jun21/8464/C/2F Do not write outside the Sodium chloride dissolves in water to form sodium chloride solution. box 0 1 . 4 Draw one line from each substance to the description of the substance. [2 marks] Substance Description of substance Sodium chloride solution Water Compound Element Hydrocarbon Mixture 0 1 . 5 Name the process used to obtain solid sodium chloride from sodium chloride solution. [1 mark]5 *05* Turn over ► IB/M/Jun21/8464/C/2F Do not write outside the box 11 0 1 . 6 Two processes used to obtain potable water from fresh water are: • filtering • sterilising. Give one reason why each process is used [Show More]

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