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Practice · Chemistry · 2025 syllabus · S1.1

IB Chemistry S1.1 The particulate nature of matter: practice questions

6 exam-style questions on S1.1 The particulate nature of matter, SL and HL: 3 multiple choice, 2 data-based and 1 structured. Each one comes with the mark scheme, a model answer and the reasoning behind every mark. Free with your email.

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S1.1-01 · Paper 1A style · multiple choice · 1 mark

Classifying a dissolved salt

Copper(II) sulfate crystals are fully dissolved in water. What type of mixture forms, and which method gives back solid copper(II) sulfate? [1]

  1. Homogeneous; crystallization
  2. Homogeneous; filtration
  3. Heterogeneous; crystallization
  4. Heterogeneous; filtration
Show the answer and the reasoning

Answer: A. A is correct. A solution has the same composition throughout, so it is homogeneous, and the dissolved solid is recovered by evaporating some of the water and letting crystals form. B: filtration only separates an undissolved solid; dissolved particles pass through the filter paper. C and D: a heterogeneous mixture has visibly different parts, such as sand in water, which a true solution does not.

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The 6 questions in S1.1

  1. S1.1-01 Classifying a dissolved saltPaper 1A style · multiple choice · 1 mark
  2. S1.1-02 Matching mixtures to methodsPaper 1A style · multiple choice · 1 mark
  3. S1.1-03 Naming a change of statePaper 1A style · multiple choice · 1 mark
  4. S1.1-04 Separating a three-part mixturePaper 1B style · data-based · 8 marks
  5. S1.1-05 Choosing a recrystallization solventPaper 1B style · data-based · 8 marks
  6. S1.1-06 Compounds, mixtures and liquidsPaper 2 style · structured question · 5 marks

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Every Biology and Chemistry question here is original, written for practice in the style of the papers set since the 2025 syllabus, with invented data. Developed independently from the International Baccalaureate Organization, which has not endorsed it. Found a mistake? Email vytis@limeadmissions.com with the question id.