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Edexcel IAL Chemistry 3.P1 Applying knowledge in practical contexts

Identify the physical or chemical constraint in the setup, then explain whether reactants can contact, the required condition can be reached or the apparatus is suitable.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
AS

Exam points

  • Explain delayed reaction by identifying when reagents first make effective contact.
  • Judge practical feasibility by comparing required conditions with apparatus capability.

3.P1—Solving practical-context problems question 1

[Maximum number: 1]

A group of students carried out a thermochemistry experiment to determine the relative atomic mass of a metal, M.

Procedure Step 1 Transfer 50.0 cm350.0 \mathrm{~cm}^{3} of a 1.35 moldm−31.35 \mathrm{~mol} \mathrm{dm}^{-3} solution of copper(II) sulfate to an expanded polystyrene cup placed in a glass beaker. Step 2 Weigh out, as accurately as possible, a known mass of the finely powdered metal M. Step 3 Measure the temperature of the copper(II) sulfate solution. Step 4 Quickly add all of the powdered metal, stir the mixture continuously and note the highest temperature reached.

Figure for Question 3.P1—Solving practical-context problems question 1 — Edexcel A-Level Chemistry AS

Each student carried out the experiment using a different mass of the metal.

Powdered metal reacts much faster than filings or granules. Suggest why this is important in this experiment.

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