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1.2 Atomic structure

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Question 3

A manufacturing process puts a coating of equal thickness on both inner surfaces of a narrow slit.

MeasurementValue
Width of slit before coating8.4 μm8.4\,\mu\text{m}8.4μm
Thickness of coating on each inner surface0.60 μm0.60\,\mu\text{m}0.60μm

A technician claims that at least 1.8 × 105 atoms would fit side by side across the slit after it has been coated.

a.

Estimate, using the typical radius of an atom, the number of atoms that would fit side by side across the width of the slit after coating. Show your working.

[3]
b.

Evaluate the technician's claim. Use your answer to part (a).

[2]
Markscheme

1.2 Atomic structure Questions

  1. GCSE
  2. /Chemistry
  3. /1.2 Atomic structure

101 exam-style questions on OCR GCSE Chemistry 1.2 Atomic structure, covering 1.2.1 Development of the atomic model, 1.2.2 The nuclear model and the size of atoms, and 1.2.3 Subatomic particles in atoms and ions. Each one has a worked solution and a mark scheme showing where the marks go.

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