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Learning objective

Calculate and interpret surface area to volume ratio.

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Topic

Exchange substances official content

Subtopic

Surface area to volume ratio

Aqa A Level BiologyOrganisms exchange substances with their environment

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Quick explanation

Calculate and interpret surface area to volume ratio

  • This point belongs to Exchange substances official content, especially Surface area to volume ratio.
  • You need to be able to calculate and interpret surface area to volume ratio.
  • The key ideas to know are volume and surface area.
  • Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

volumesurface area

Why it matters

This objective helps connect Surface area to volume ratio to exam-style questions, flashcards, and revision notes for Exchange substances official content.

Quick student answer

What is the surface area to volume ratio of a cube with a side length of 2 cm?

Direct answer

The surface area of a cube is calculated using the formula 6a², where a is the side length. For a cube with a side length of 2 cm, the surface area is 6(2²) = 24 cm². The volume is a³, which is 2³ = 8 cm³. Therefore, the surface area to volume ratio is 24 cm² / 8 cm³ = 3:1.

Key terms

  • Surface Area: The total area of the surface of a three-dimensional object, crucial for exchange processes.
  • Volume: The amount of space an object occupies, which increases more rapidly than surface area as size increases.

Common trap

Miscalculating Ratios: Always double-check the formulas used for surface area and volume before calculating the ratio.

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