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A*
βš—οΈ Chemistry A Level
βœ“ Mark Scheme Aligned
Question

Explain why the rate of reaction increases with temperature, using collision theory.

Mark Scheme Answer

Higher temperature β†’ greater kinetic energy β†’ more frequent collisions with energy β‰₯ activation energy β†’ increased rate of successful collisions.

🧬 Biology A Level β€” Edexcel
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Past Paper Question (6 marks)

Describe how the products of digestion are absorbed into the blood from the small intestine, and explain how the structure of the ileum is adapted for this function.

StemStack Answer

Glucose & amino acids β†’ active transport; fatty acids & glycerol β†’ lacteals (lymph). Adaptations: microvilli (↑ SA), thin epithelium (↓ diffusion distance), rich blood supply, mitochondria-dense cells (ATP for active transport).


Edexcel Mark SchemeEDEXCEL
Glucose/amino acids absorbed by active transport 1
Fatty acids/glycerol β†’ triglycerides β†’ lacteals 1
Microvilli increase surface area for absorption 1
Thin epithelium reduces diffusion distance 1
Dense capillary network maintains concentration gradient 1
Many mitochondria supply ATP for active transport 1

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AQA 8462 5 sample cards βœ“ Mark Scheme Aligned
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