eMusic Study Pack - Factors Affecting Diffusion

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eMusic Study Pack • Biology

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📖 Comprehensive Note

Diffusion is the net movement of particles from an area of higher concentration to an area of lower concentration. The rate of diffusion depends on multiple factors — most importantly the concentration gradient, temperature, surface area, size of molecules, distance (thickness of barrier), and the nature of the medium (gas, liquid, solid).

Steeper concentration differences and higher temperatures increase diffusion rates; larger surface area and smaller molecules also speed diffusion. Longer distances and denser media slow diffusion down.

🎤 Lyrics + Audio

Verse 1 The greater the difference in concentration between two regions, the faster the diffusion. Molecules move from high to low concentration until equilibrium is reached — that’s the solution! uhhhh..yeahhh eee hmmmmm Higher temperatures increase the kinetic energy of molecules, making them move faster, thus increasing diffusion. yeahhhhh ehhh Lower temperatures slow molecular movement, decreasing diffusion — that’s the conclusion. Chorus uh...uh..uh...uh...uh The rate of diffusion is affected by concentration, temperature, yeah yea surface area, uh...size of molecules, distance, and the nature of the medium. hmmmmm Verse 2 A larger surface area allows more molecules to diffuse at once, increasing the rate. Smaller surface area slows down diffusion — that’s its fate. uhhhh..yeahhh eee hmmmmm Smaller molecules diffuse faster than larger ones. Larger molecules move slower due to greater resistance — that’s how it runs. Chorus uh...uh..uh...uh...uh The rate of diffusion is affected by concentration, temperature, yeah yea surface area, uh...size of molecules, distance, and the nature of the medium. hmmmmm

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📊 Line-by-Line Study Guide

Lyric Line	Explanation
Greater difference in concentration → faster diffusion	Steeper gradient produces a larger net flux of particles (Fick's principle).
Molecules move from high to low until equilibrium	Diffusion proceeds spontaneously until concentrations are equal (no net flux).
Higher temperatures increase kinetic energy	Particles move faster at higher temperature, increasing collision frequency and rate of diffusion.
Lower temperatures slow movement	Lower kinetic energy = slower diffusion rate.
Surface area affects rate	Larger area provides more space for molecules to cross per unit time (e.g., alveoli vs. skin).
Size of molecules	Smaller molecules experience less friction and diffuse more quickly than larger ones.
Distance and medium	Shorter distances and less dense media (gases) allow faster diffusion than long distances or dense media (solids).

💡 Mnemonic

"C T S S D M" — Concentration, Temperature, Surface area, Size, Distance, Medium (factors affecting diffusion).

❓ Quiz

1. Which increases diffusion rate?

2. Smaller molecules compared to larger molecules?

3. What effect does a larger surface area have?

4. Which medium generally allows fastest diffusion?

5. The main driving force for diffusion is?

🃏 Flashcards

Q1: Name two factors that increase diffusion rate.

Higher temperature, steeper concentration gradient (also larger surface area, smaller molecules).

Q2: How does distance affect diffusion?

Greater distance (thicker barrier) slows diffusion; shorter distance speeds it.

Q3: Why do gases diffuse faster than liquids?

Gases have lower density and fewer collisions with the medium, allowing faster movement.

Q4: Give the mnemonic for factors affecting diffusion.

C T S S D M — Concentration, Temperature, Surface area, Size, Distance, Medium.

🎯 Drag & Drop

Drag each description into the matching factor box.

Concentration Gradient

Temperature

Surface Area

Molecule Size

Distance / Medium

Steeper gradient — faster movement

Higher temp — more kinetic energy

Larger area — more passage points

Smaller molecule — less resistance

Thicker / denser medium — slower

📌 Summary

Diffusion moves particles from high → low until equilibrium.
Rate depends on concentration gradient, temperature, surface area, molecule size, distance, and medium.
Steeper gradients, higher temperature, larger surface area, and smaller molecules increase diffusion rate.
Longer distance and denser medium slow diffusion.