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⚗️ Chemistry A Level ✓ Mark Scheme
Question
Explain why reaction rate increases with temperature, using collision theory.
Mark Scheme Answer
Higher temperature → greater kinetic energy → more frequent collisions with energy ≥ activation energy → increased rate of successful collisions.
🧬 Biology A Level — Edexcel ✓ Mark Scheme
Past Paper Question (6 marks)
Describe how products of digestion are absorbed from the small intestine. Explain how the ileum is adapted for this function.
StemStack Answer
Glucose & amino acids → active transport; fatty acids & glycerol → lacteals. Adaptations: microvilli (↑ SA), thin epithelium (↓ diffusion distance), rich blood supply, mitochondria (ATP for active transport).
Edexcel Mark Scheme EDEXCEL
Glucose/amino acids absorbed by active transport 1
Microvilli increase surface area for absorption 1
Thin epithelium reduces diffusion distance 1
Many mitochondria supply ATP for active transport 1
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Comprehensive packs for every level. Click any subject to preview real flashcards before you buy.

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Biology A Level

Full flashcard pack coming soon

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Biology

Full A Level — Year 12 + 13

  • ✓133 flashcards — all 7 topics
  • ✓Full mark scheme terminology
  • ✓Private download link provided after purchase
  • ✓Also emailed within 24 hours
A Level (Full)£7.99
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Chemistry A Level

Full flashcard pack coming soon

Coming Soon
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Chemistry

Full A Level — Year 12 + 13

  • ✓174 flashcards — all 10 topics
  • ✓Mark scheme aligned throughout
  • ✓Private download link provided after purchase
  • ✓Also emailed within 24 hours
A Level (Full)£7.99
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Psychology A Level

Full flashcard pack coming soon

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Psychology

Full A Level — Year 12 + 13

  • ✓150+ flashcards
  • ✓AO1, AO2, AO3 differentiated
  • ✓Private download link provided after purchase
  • ✓Also emailed within 24 hours
A Level (Full)£9.99
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Biology AS Level

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Biology

AS Level — Year 12

  • ✓Year 12 content in full
  • ✓All major exam boards
  • ✓Mark scheme terminology
  • ✓Private download link provided after purchase
  • ✓Also emailed within 24 hours
AS Level£5.99
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Chemistry AS Level

Coming soon

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Chemistry

AS Level — Year 12

  • ✓Year 12 content in full
  • ✓Mark scheme aligned throughout
  • ✓Reaction mechanisms included
  • ✓Private download link provided after purchase
  • ✓Also emailed within 24 hours
AS Level£5.99
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Psychology AS Level

Coming soon

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Psychology

AS Level — Year 12

  • ✓Year 12 content in full
  • ✓Key studies & evaluations
  • ✓AO1, AO2, AO3 differentiated
  • ✓Private download link provided after purchase
  • ✓Also emailed within 24 hours
AS Level£6.99
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Chemistry

AQA · Edexcel · OCR

  • ✓174 flashcards — all topics covered
  • ✓Mark scheme aligned throughout
  • ✓Paper 1 & Paper 2 complete
  • ✓Private download link provided after purchase
  • ✓Also emailed within 24 hours
GCSE£4.99
🧬

Biology

AQA · Edexcel · OCR

  • ✓133 flashcards — all topics covered
  • ✓Mark scheme language throughout
  • ✓Paper 1 & Paper 2 complete
  • ✓Private download link provided after purchase
  • ✓Also emailed within 24 hours
GCSE£4.99
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Physics

AQA · Edexcel · OCR

  • ✓106 flashcards — all topics covered
  • ✓Equations & mark scheme language
  • ✓Paper 1 & Paper 2 complete
  • ✓Private download link provided after purchase
  • ✓Also emailed within 24 hours
GCSE£4.99
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Psychology

AQA · Edexcel · OCR

  • ✓All key studies covered
  • ✓AO1 & AO2 differentiated
  • ✓Mark scheme language
  • ✓Private download link provided after purchase
  • ✓Also emailed within 24 hours
GCSE£5.99
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Geography

AQA · Edexcel · OCR

  • ✓92 flashcards — all topics covered
  • ✓Physical & human geography
  • ✓Case studies & mark scheme language
  • ✓Private download link provided after purchase
  • ✓Also emailed within 24 hours
GCSE£4.99
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Computer Science

AQA · Edexcel · OCR

  • ✓Theory & programming concepts
  • ✓Algorithms & data structures
  • ✓AQA & OCR
  • ✓Private download link provided after purchase
  • ✓Also emailed within 24 hours
GCSE£4.99
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History GCSE

Flashcards coming soon

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History

AQA · Edexcel · OCR

  • ✓Key events & causes
  • ✓Mark scheme language
  • ✓All exam boards
  • ✓Private download link provided after purchase
  • ✓Also emailed within 24 hours
GCSE£4.99
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Religious Studies

AQA · Edexcel · OCR

  • ✓Key beliefs & practices
  • ✓Mark scheme language throughout
  • ✓Christianity, Islam & more
  • ✓Private download link provided after purchase
  • ✓Also emailed within 24 hours
GCSE£4.99
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Business Studies

AQA · Edexcel · OCR

  • ✓Key concepts & theories
  • ✓Mark scheme language throughout
  • ✓AQA, Edexcel & OCR
  • ✓Private download link provided after purchase
  • ✓Also emailed within 24 hours
GCSE£4.99
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33% off 🏆 Bestseller

Combined Science Bundle AQA

Chemistry + Biology + Physics — all 3 AQA GCSE science packs

⚗️ 174 cards 🧬 133 cards ⚡ 106 cards
£14.97
£9.99
413 cards total
🔬
33% off

Combined Science Bundle OCR

Chemistry + Biology + Physics — all 3 OCR GCSE science packs

⚗️ 174 cards 🧬 133 cards ⚡ 106 cards
£14.97
£9.99
413 cards total
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33% off

Combined Science Bundle Edexcel

Chemistry + Biology + Physics — all 3 Edexcel GCSE science packs

⚗️ 174 cards 🧬 133 cards ⚡ 106 cards
£14.97
£9.99
413 cards total
Featured Resources
Complete Study Guide

✍️ English Language GCSE

Paper 1 & Paper 2 — every question broken down, Grade 8/9 model answers, mark scheme language, analysis frameworks and technique banks. Everything you need, in one guide.

✓Q1–Q5 Paper 1 with worked examples
✓Q1–Q5 Paper 2 with worked examples
✓Mark scheme breakdowns per question
✓Grade 8/9 model answers throughout
✓Language & structural analysis frameworks
✓Complete vocabulary & technique banks
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Sample — P1 Q4
"The writer makes the setting completely threatening."
I partly agree. The "screaming" wind is effective — violent verbs make the setting hostile. However, the mid-text light creates contrast that heightens the menace...
£19.99
one-time · instant download
Complete Revision Bundle

📐 Maths GCSE Complete Bundle

The ultimate GCSE Maths revision resource — every topic, full worked examples, formula sheets, exam technique guides, Foundation and Higher content all in one comprehensive bundle.

✓Foundation & Higher tier content
✓All topics — Number, Algebra, Geometry
✓Full formula & key facts sheets
✓Worked examples for every question type
✓Exam technique & grade boundary guide
✓Statistics, Probability & Ratio
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This guide was written by humans with the support of AI tools. All content has been reviewed for accuracy.

Topics Covered
Number Algebra Geometry Statistics Probability Ratio
£19.99
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📚 Maths & English Language Bundle

Complete Maths revision guide + Complete English Language guide — the two most important GCSE subjects in one discounted bundle. Suitable for All Exam Boards.

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📐 Maths Complete Guide
20 pages · Foundation & Higher · All topics, worked examples, formula sheet & exam technique
✍️ English Language Guide
16 pages · Paper 1 & Paper 2 · Grade 8/9 model answers, mark scheme breakdowns & technique banks
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Common questions

Everything you need to know before you buy.

When do I get my download? +
Instantly. As soon as your payment goes through you get a private download link on the confirmation page — no waiting. Within 24 hours you'll also receive the same link by email, so it's stored in two places. Once you have it, it's yours permanently. And if we ever update a pack, we'll send you the new version automatically.
Which exam board do the flashcards cover? +
All of them. The content is written in mark scheme language that applies across AQA, Edexcel and OCR — the core facts, definitions and answers examiners want are the same regardless of board. If a topic is board-specific it's clearly labelled.
Can I print the flashcards? +
Yes. Every pack is a PDF, so you can print it at home or at a library, or use it on any device — phone, tablet, laptop. Most students use both: digital for on-the-go, printed for desk revision.
Is it worth it if my exams are soon? +
Especially then. The flashcards are designed for last-minute cramming — every card is a self-contained fact written exactly how the examiner wants it. You download, open, and start revising in under a minute.
What grade level are these written at? +
Grade 9. Every answer is written to the standard examiners expect for full marks — precise terminology, complete explanations, nothing vague. If you learn the cards as written, you're revising at the top of the grade boundary.
⚗️
Chemistry GCSE
Free Preview · 6 cards · Mark scheme aligned
Card 1 of 6
Question
Click to flip Topic
StemStack Answer
AQA mark scheme language Correct ✓

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All topics · Mark scheme aligned throughout