A Level Chemistry A H432/01 Periodic table, elements and physical chemistry Practice paper – Set 2-2021

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ou should spend a maximum of 20 minutes on this section. Write your answer to each question in the box provided. Answer all the questions. 1 Which ion has a different number of electrons from the o... ther three ions? A Ca2+ B Cl − C Ga3+ D S2− Your answer [1] 2 What is the percentage, by mass, of O in Mg(NO3) 2•4H2O? A 29.05% B 43.58% C 50.84% D 72.63% Your answer [1] 3 50cm3 of 6.0moldm–3 HCl is mixed with 90cm3 of 3.0moldm–3 HNO3. What is the H+(aq) concentration in the resulting solution? A 1.9moldm–3 B 2.1moldm–3 C 4.1moldm–3 D 4.5moldm–3 Your answer [1] 3 © OCR 2016 Practice paper H432/01 Turn over 4 Phosphorus reacts with aqueous sodium hydroxide as in the equation below. P4 + 3NaOH + 3H2O PH3 + 3NaH2PO2 Which element is oxidised? A hydrogen B oxygen C phosphorus D sodium Your answer [1] 5 Ethene reacts with hydrogen to form ethane. C2H4(g) + H2(g) C2H6(g) ΔH = –125kJmol–1 The table below shows some average bond enthalpies. Bond Average bond enthalpy /kJmol–1 H–H +436 C–C +347 C=C +612 What is the bond enthalpy of the C–H bond? A –826.0kJmol–1 B –413.0kJmol–1 C +413.0kJmol–1 D +826.0kJmol–1 Your answer [Show More]

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