| Method |
Precise Learning Objective |
Linked |
Question / Activity
(Designed for maximum working out) |
Stepping Stones |
Pitstop Check
(Thinking Map) |
| W |
Particles in a fluid are always moving. |
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Describe what particles do in a fluid. |
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Diffusion is the movement of a substance from a region of higher concentration to a region of lower concentration. |
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What is diffusion? |
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Concentration is the number of a particular type of particle in a volume of space. |
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What is concentration? |
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Horizontally, half the particles will be moving to the left and half to the right. |
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Half of a large number is more than half of a smaller number.
So more particles will travel from a larger number of particles (high concentration), than are replaced by the smaller number moving form the smaller number of particles (lower concentration). |
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How do the random movement of particles result in the movement from a higher concentration to a lower concentration? |
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| T |
Diffusion happens fastest when:
- there is a large surface area
- there is a large difference in concentration
- there is a short distance between areas of differing concentration.
- at higher temperatures. |
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Under what conditions does diffusion happen faster? Students explain why these statements are true in terms of the particle model. |
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Glucose diffuses into a muscle cell, because there is a higher concentration of glucose particles in the blood than the cell. |
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Why does glucose diffuse into muscle cells from the blood? Draw a diagram from the description. |
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Oxygen diffuses into a muscle cell, because there is a higher concentration of oxygen particles in the blood than the cell. |
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Why does oxygen diffuse into muscle cells from the blood? |
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Carbon dioxide diffuses out of a muscle cell, because there is a higher concentration of Carbon dioxide particles in the cell than the blood. |
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Why does carbon dioxide diffuse out of muscle cells into the blood? |
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Water diffuses out a muscle cell, because there is a higher concentration of oxygen particles in the blood than the cell. |
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Why does water diffuse out of muscle cells into the blood? |
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| A |
Diffusion occurs through the cell membrane, because there are small gaps in the me. |
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How can diffusion occur in and out of cells. |
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| T |
Partially-permeable allows certain particles through but not others. |
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What does partially-permeable mean? |
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| W |
These small gaps allow smaller molecules through but not larger ones. This means the membrane is partially-permeable |
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Why is the cell membrane referred to as partially-permeable? |
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