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May 2025 Section II

0/46 marks

2025 · 7 questions · 40 parts · 46 marks

0Correct0Partial0Wrong40Unattempted
1(A)(i)1(A)(ii)1(B)(i)1(B)(ii)1(C)1(D)1(E)(i)1(E)(ii)1(E)(iii)1(F)2(A)2(B)(i)2(B)(ii)2(B)(iii)2(C)2(D)3(A)3(B)(i)3(B)(ii)3(C)3(D)3(E)3(F)(i)3(F)(ii)4(A)4(B)4(C)(i)4(C)(ii)5(A)5(B)5(C)5(D)6(A)6(B)6(C)6(D)7(A)7(B)(i)7(B)(ii)7(C)
Context for question 5
Complete Lewis diagrams and some physical properties for compounds X and Y are given.
Lewis diagrams, molar masses and boiling points of compounds X and Y
5(A)Covalent Bonding, Lewis Structures and Molecular ShapeEasy1 mark
Based on VSEPR theory, predict the geometry around the Si atom in compound Y.
5(B)Intermolecular Forces, Structure and Properties of SubstancesMedium1 mark
A student claims that compound Y has a higher boiling point than that of compound X because compound Y has stronger London dispersion forces. Do you agree or disagree? Justify your answer.
5(C)States of Matter and Gas LawsMedium1 mark
An equimolar mixture of the two compounds is heated. When the mixture reaches 82∘C, which compound will have the higher vapor pressure? Justify your answer.
5(D)States of Matter and Gas LawsEasy1 mark
The mixture is heated to 198∘C in a sealed, rigid 12.5 L container, at which point both substances are gases and the total pressure in the container is 2.30 atm. Calculate the number of moles of gas particles in the container.
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