Diffusion

• Why does diffusion take place faster in hotter areas?

  The particles have an increase in kinetic energy making them spread out faster.
• What type of process is diffusion?

  Diffusion is a passive process that does not require energy.
• What factors affect the rate of diffusion?

  The rate of diffusion depends on temperature, particle size, and surface area.
• How does surface area affect the rate of diffusion?

  A larger surface area allows for more particles to diffuse simultaneously.
• What happens to the diffusion rate if an apple is cut into smaller pieces?

  Cutting the apple increases its surface area, which increases the rate of flavour diffusion.
• What is a concentration gradient?

  A concentration gradient is the difference in concentration of a substance between two areas.
• How does food coloring demonstrate diffusion?

  Food coloring spreads out in water due to diffusion, moving along the concentration gradient until evenly distributed.
• What are the key factors affecting diffusion rate?

  • Concentration gradient
  • Temperature
  • Particle size
  • Distance
  • Surface area
  • Medium density
• How do particles move during diffusion?

  Particles move in a random and passive way, requiring no energy.
• What is a partially permeable membrane?

  A partially permeable membrane allows some substances to pass through while blocking others.
• What are examples of small molecules that can pass through a partially permeable membrane?

  Small molecules include gases, glucose, and urea.
• What is an example of a large molecule that cannot pass through a partially permeable membrane?

  Starch is an example of a large molecule that cannot pass through.
• Where does diffusion often occur in biological systems?

  Diffusion often occurs across a partially permeable membrane in biological systems.
• What are two types of diagrams used to depict diffusion?

  Diagrams can show concentration gradients and particle movement directions.
• How does temperature affect diffusion?

  Higher temperatures increase the kinetic energy of particles, allowing them to move faster.
• What is the definition of a partially permeable membrane?

  • Allows some substances to pass through
  • Blocks others, typically large molecules
  • Small molecules can usually pass through
• What factors affect the rate of diffusion?

  1. Temperature: Higher temperature increases kinetic energy and speed of particles.
  2. Concentration: Diffusion occurs down a concentration gradient.
  3. Surface area to volume ratio: Larger ratio leads to faster diffusion.
• How is surface area calculated?

  Surface area is calculated as length x width x amount of faces.
• How is volume calculated?

  Volume is calculated as length x width x height.
• What is the relationship between surface area to volume ratio and diffusion rate?

  A bigger surface area to volume ratio results in faster diffusion.
• What happens when the surface area to volume ratio is smaller?

  A smaller surface area to volume ratio results in a slower rate of diffusion.
• Diffusion

  The net movement of particles from an area of high concentration to an area of low concentration until evenly distributed.