Chemistry > AQA Question Papers > AS CHEMISTRY Paper 1 Inorganic and Physical Chemistry. EXAM QUESTIONS. (All)

AS CHEMISTRY Paper 1 Inorganic and Physical Chemistry. EXAM QUESTIONS.

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Answer all questions in this section. 0 1 This question is about atomic structure. 0 1 . 1 There is a general trend for an increase in ionisation energy across Period 3. Give one example of an elem... ent that deviates from this trend. Explain why this deviation occurs. [3 marks] Element Explanation 0 1 . 2 Give an equation, including state symbols, to represent the process that occurs when the third ionisation energy of sodium is measured. [1 mark 0 1 . 3 Figure 1 shows the successive ionisation energies of a Period 3 element, X. box Figure 1 Identify element X. Explain your choice. [3 marks] Element Explanation Turn over for the next question 74 *04* IB/M/Jun20/7404/1 Do not write outside the 0 2 This question is about a titration. box A student dissolves an unknown mass of sodium hydroxide in water to make 200 cm3 of an aqueous solution. A 25.0 cm3 sample of this sodium hydroxide solution is placed in a conical flask and is titrated with 0.150 mol dm–3 sulfuric acid. The equation for this reaction is shown. 2NaOH(aq) + H2SO4(aq) → Na2SO4(aq) + 2H2O(l) Table 1 shows the results of the titrations. Table 1 Titration Rough 1 2 3 Final reading / cm3 20.75 40.35 21.05 40.60 Initial reading / cm3 0.00 20.75 1.20 21.05 Titre / cm3 20.75 19.60 19.85 19.55 0 2 . 1 Calculate the mass of sodium hydroxide used to make the original solution. [Show More]

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