Copy of SCSS Prelim 2024 Chem P1 QP & MS

2 Swiss Cottage Secondary School / Chemistry Paper 1 / 4 Express / Prelim Exam 2024 1 Bromate ion, bromide ion and hydrogen ions react according to the equation as shown. BrO3 -(aq) + 5Br-(aq) + 6H+(aq) → 3Br2(aq) + 3H2O(l) Some apparatus for measuring the change in the rate of this reaction are suggested. 1 gas syringe 2 balance 3 pH meter Which apparatus are suitable to measure the rate of this reaction? A 1 only B 3 only C 1 and 2 D 2 and 3 2 A mixture of propane, butane, hydrogen sulfi de and carbon dioxide at -30 oC is allowed to cool down gradually to -200 oC. compound melting point / oC boiling point / oC propane -188 -42 butane -135 -1 hydrogen sulfide -85 -51 carbon dioxide -78 -78 Which compound will solidify first? A butane B carbon dioxide C hydrogen sulfide D propane

3 Swiss Cottage Secondary School / Chemistry Paper 1 / 4 Express / Prelim Exam 2024 3 The apparatus shown is used to obtain ethanol from a dilute solution of ethanol in water. [boiling point of ethanol: 78 C] Which graph shows the change in concentration of the ethanol in the boiling flask as the distillation proceeds?

4 Swiss Cottage Secondary School / Chemistry Paper 1 / 4 Express / Prelim Exam 2024 4 Which option correctly shows the numbers of particles in ? protons neutrons electrons A 16 16 16 B 16 18 18 C 18 16 20 D 20 14 22 5 A sample of oxygen is a mixture of the two isotopes 16 8 O and 18 8 O. The relative atomic mass of carbon is 12. What are possible values of the relative molecular mass of different molecules of carbon dioxide formed by the combination of carbon and oxygen. 1 44 2 46 3 48 A 1 only B 1 and 2 only C 1 and 3 only D 1, 2 and 3 6 Three elements X, Y and Z have consecutive increasing proton (atomic) numbers. If element Z is a noble gas, how is a stable compound formed between X and Y? A An atom of X transfers 2 electrons to 1 atom of Y to form XY. B An atom of X transfers 2 electrons to 2 atoms of Y to form XY2. C An atom of X shares 2 electrons with 1 atom of Y to form XY. D An atom of X shares 2 electrons with 2 atoms of Y to form XY2.

5 Swiss Cottage Secondary School / Chemistry Paper 1 / 4 Express / Prelim Exam 2024 7 Which solid contains more than one type of bonding? A magnesium nitrate B silicon dioxide C sodium chloride D zinc 8 P, Q and R represent three different structures of an element. Which structures are giant covalent? A P and Q B P and R C Q and R D P, Q and R 9 5.0 g samples of the carbonates of barium, copper, sodium and magnesium are decomposed to form the metal oxides and carbon dioxide. For which compound is there the greatest loss in mass? A barium carbonate B copper(II) carbonate C magnesium carbonate D sodium carbonate Q

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