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Properties of materials

Properties of materials

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Question 9

An investigation is carried out to classify four different unknown samples (1, 2, 3, and 4) as elements, compounds, or mixtures based on their physical and chemical properties:

  • Substance 1: A solid with a sharp melting point at 114∘C114^\circ\text{C}114∘C. When heated, it sublimes to form a purple vapour containing only one type of atom.
  • Substance 2: A liquid that boils over a temperature range of 110∘C110^\circ\text{C}110∘C to 125∘C125^\circ\text{C}125∘C and can be separated into distinct fractions by fractional distillation.
  • Substance 3: A solid that does not conduct electricity but, when molten, conducts electricity and decomposes via electrolysis to yield two different pure substances.
  • Substance 4: A lustrous solid that conducts electricity in both the solid and liquid states, and cannot be simplified further by any chemical reaction.

Which option correctly classifies these four substances?

A

Substance 1: Compound; Substance 2: Mixture; Substance 3: Compound; Substance 4: Element

B

Substance 1: Element; Substance 2: Compound; Substance 3: Mixture; Substance 4: Element

C

Substance 1: Element; Substance 2: Mixture; Substance 3: Compound; Substance 4: Element

D

Substance 1: Mixture; Substance 2: Mixture; Substance 3: Compound; Substance 4: Compound

Markscheme

Properties of materials Questions

  1. GCSE
  2. /Chemistry
  3. /Properties of materials

48 exam-style questions on OCR GCSE Chemistry Properties of materials. Each one has a worked solution and a mark scheme showing where the marks go.

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