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AQA GCSE Science revision

GCSE Science,
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Short flashcards made by students who have sat the exams, matched to your exact AQA course and brought back when you need them.

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Example revision card · Biology
Question

What is the function of the nucleus?

Answer

Contains genetic material and controls the activities of the cell.

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3,799Audited flashcards
537AQA specification points
3Recall choices

537 assessable specification points mapped across AQA Biology, Chemistry and Physics.

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Audited flashcards

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537

AQA points mapped

Assessable points across the supported AQA Science courses.

Course and tier checked

You revise cards matched to what you actually study.

Practicals checked

Required Practical cards keep the essential method steps.

Compare two flashcards

55 fewer words. Same six marks.

The same five method stages, with less wording in the Aymro example.

Typical flashcard123 words
Question

How can the effect of pH on the rate at which amylase digests starch be investigated?

Answer · five matched stages
  1. 1

    Begin by placing one drop of iodine solution into each well of a clean spotting tile, ready for repeated tests.

  2. 2

    Measure fixed volumes of amylase solution, starch solution and a buffer at the chosen pH. Keep their concentrations unchanged, bring them to a constant temperature, mix them and start the timer immediately.

  3. 3

    At 30-second intervals, remove a fresh sample of the reaction mixture and add it to the next iodine drop.

  4. 4

    Continue until a sample leaves the iodine orange-brown, showing that no starch remains. Record the time, then repeat with buffers at other pH values while keeping temperature, volumes and concentrations constant.

  5. 5

    Compare the recorded times, or calculate the reaction rate as one divided by the time taken.

Aymro flashcard68 words
Question

How can the effect of pH on the rate at which amylase digests starch be investigated?

Answer · five matched stages
  1. 1

    Place iodine drops in a spotting tile.

  2. 2

    Mix fixed volumes and concentrations of amylase, starch and a chosen pH buffer; keep the mixture at constant temperature and start timing.

  3. 3

    Every 30 seconds, add a sample to fresh iodine.

  4. 4

    Record when the iodine stays orange-brown, then repeat at other pH values while keeping other variables constant.

  5. 5

    Compare the times, or calculate rate as 1/t.

Aymro · BIO-1779 · Biology Required Practical
12368 words55 fewer words. Same six marks.Five matched method stages

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Practice · Biology

Why does increasing temperature usually increase the rate of a reaction?

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Biology1,303flashcards
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Everything needed for focused AQA Science revision.

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