Cells - CH1+CH2+CH3

• What type of particles diffuse from a toaster to our noses when toast is burnt?

  Chemical particles
• What process explains smelling burnt toast in another room?

  Diffusion
• What is the net movement of particles from high to low concentration called?


  Diffusion
• How do 'smelly' particles move from high to lower concentration?

  Through air particles
• What is the sequence of diffusion?

  • The particles are separate when first put together
  • They slowly start to mix due to their random motion
  • The particles are now nearly diffuse
  • The particles are fully diffuse
• How does higher temperature affect particles kinetic energy?

  Increases it
• What does a steeper concentration gradient indicate about the rate of diffusion?

  Faster rate of diffusion
• Which diagram shows the steepest concentration gradient?

  Diagram A
• In which diagram would diffusion occur the slowest?

  Diagram C
• How does temperature affect the rate of diffusion?

  Increases the rate
• What term completes the sentence: the _________ the temperature the quicker the rate of diffusion?

  Higher
• What do particles do more often when they have more energy and move around more?

  Collide
• Why does diffusion happen more rapidly when temperature increases?

  Particles move/collide more
• What is the purpose of creating quiz questions about diffusion?

  To test knowledge
• How are the lungs adapted for diffusion?

  • Many alveoli - provide a large surface area
  • Thin membranes/walls - short diffusion pathway
  • Good blood supply/large capillary network - maintains steep diffusion gradient
• Why does increased surface area increase the rate of diffusion?

  Diffusion takes place over increased area
• How is the small intestine adapted for diffusion?

  • Many villi and microvilli - increase the surface area
  • Thin walls of villi - provides a short diffusion pathway
  • Good blood supply/large capillary network - maintains a steep diffusion gradient
• What is the goal of this osmosis lesson?

  Define ‘osmosis’
• What is the purpose of understanding osmosis in animal and plant cells?

  To understand its importance
• What is being compared in this lesson?

  Osmosis differs from diffusion
• Why is controlling water movement important to animal cells?

  To prevent cell damage
• What aspect of water movement is described in this lesson?

  Factors affecting movement
• What should students be able to state in this lesson starter?

  Meaning of diffusion
• What should students be able to describe in this lesson starter?

  Factors affecting diffusion rate
• What should students be able to explain regarding animal cells in this lesson starter?

  Adaptation to increase diffusion
• What is the substance called that dissolves another substance?

  Solvent
• What is the substance called that is dissolved by a solvent?

  Solute
• Where does water move from and to in osmosis?

  High to low concentration
• Why are membranes described as partially permeable?

  Some particles are too big
• Why are membranes described as partially permeable?

  Some particles have certain charges
• Which diagram represents pure water?

  Diagram A
• Which diagram represents a dilute solution?

  Diagram B
• Which diagram represents a concentrated solution?

  Diagram C
• What happens when water concentration is the same inside and outside the cell?

  No NET osmosis
• What are solutions with the same water concentration called?

  Isotonic
• What term describes the solution with higher solute concentration?

  Hypertonic
• What happens to animal cells in a hypertonic solution?

  They shrink
• What term describes the solution with lower solute concentration?

  Hypotonic
• What are some properties of the 'burnt toast smell' that affect its rate of diffusion?

  Volatility and particle size
• How does the particle model explain the diffusion of particles?

  Random motion and KE