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2.3 Properties of materials

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Question 8

A manufacturer is selecting cube-shaped nanoparticles for an electronic sensor. The required surface area to volume ratio is 0.2:10.2 : 10.2:1.

Four batches are available.

BatchEdge length of each particle in nm
P5
Q15
R30
S60

Use the equations:

surface area of a cube = 6 × (side length)2^{2}2

volume of a cube = (side length)3^{3}3

surface area to volume ratio = surface area ÷ volume

Which batch has the required surface area to volume ratio?

[1]
A

Batch S

B

Batch P

C

Batch Q

D

Batch R

Markscheme

2.3 Properties of materials Questions

  1. GCSE
  2. /Chemistry
  3. /2.3 Properties of materials

122 exam-style questions on OCR GCSE Chemistry 2.3 Properties of materials, covering 2.3.1 Carbon bonding and the variety of organic compounds, 2.3.2 Diamond, graphite, fullerenes and graphene, 2.3.3 Bond strength, changes of state and predicting states, 2.3.4 Bulk properties and types of bonding, and 2.3.5 Nanoparticles: scale, surface area, uses and risks. Each one has a worked solution and a mark scheme showing where the marks go.

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