Advanced level 2026 catholic mock Chemistry 2

This second image contains structured theory and calculation questions. Here is the data extracted from the document:

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Section 1: Solutions and Concentrations

1 a) Solutions are commonly used in the laboratory.

• i) State one common use of a standard solution.

  • (Answer space provided)

• ii) What is a saturated solution?

  • (Answer space provided)

• iii) How could an aqueous solution of iodine be prepared from the solid in the laboratory?

  • (Answer space provided)

• iv) Calculate the mass of sodium thiosulphate pentahydrate ($Na_2S_2O_3 \cdot 5H_2O$) required to prepare $0.17\text{ mol dm}^{-3}$ solution.

  • (Answer space provided)

  • (5 marks)

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Section 2: Reaction Kinetics

b) Sketch the graph in grid below to show

• i) Second order reaction

• ii) First order reaction

Graph Axes:

• Y-axis: Reaction rate

• X-axis: Concentration of reactant

• (2 marks)

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Section 3: Experimental Data

c) The data below was obtain at a curtained at a certain temperature for the reaction

(Note: The data table and the rest of the reaction description are cut off at the bottom of the page.)

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Note on Question 1a(iv): The question asks for the mass required for a $0.17\text{ mol dm}^{-3}$ solution but does not specify the final volume (e.g., $1\text{ dm}^3$ or $250\text{ cm}^3$). Usually, in such exams, if a volume isn’t stated, it’s calculated for $1\text{ dm}^3$.