Diffusion Osmosis Worksheet 166kg27 | PDF - Free Printable
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Step-by-step solution for: Diffusion Osmosis Worksheet 166kg27 | PDF
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Show Answer Key & Explanations
Step-by-step solution for: Diffusion Osmosis Worksheet 166kg27 | PDF
Let's solve this Science 8 – Diffusion & Osmosis Worksheet step by step, using the vocabulary provided and understanding the concepts of diffusion and osmosis.
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- A selectively permeable membrane
- Diffusion
- Concentration
- Osmosis
---
We’ll use the terms from the vocabulary box to answer these. Words can be used more than once.
---
1) ________________________ refers to the amount of a substance in a given space.
✔ Answer: *Concentration*
> Explanation: Concentration is how much of a substance (like sugar or salt) is present in a certain volume. For example, a high concentration means many particles in a small area.
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2) ________________________ is the movement of particles from an area of higher concentration to an area of lower concentration.
✔ Answer: *Diffusion*
> Explanation: This is the definition of diffusion — particles move randomly and spread out until evenly distributed.
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3) ________________________ allows some materials to pass through it but keeps other materials out.
✔ Answer: *A selectively permeable membrane*
> Explanation: This type of membrane lets only certain molecules (like water) pass through while blocking others (like large sugar molecules). Cell membranes are examples.
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4) ________________________ is the diffusion of water molecules through a selectively permeable membrane.
✔ Answer: *Osmosis*
> Explanation: Osmosis is a special case of diffusion where water moves across a membrane from low solute concentration to high solute concentration.
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5) ________________________ moves wastes from inside a cell to outside a cell.
✔ Answer: *Diffusion*
> Explanation: Waste products like carbon dioxide move out of cells via diffusion because their concentration is higher inside the cell than outside.
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6) ________________________ can be compared to a window screen.
✔ Answer: *A selectively permeable membrane*
> Explanation: Just like a window screen allows air and small things through but blocks insects and larger objects, a selectively permeable membrane allows certain substances in and out.
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7) ________________________ happens when water particles move from a place where their concentration is higher to a place where their concentration is lower.
✔ Answer: *Osmosis*
> Explanation: This describes osmosis — water moves down its concentration gradient (from high water concentration to low).
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8) ________________________ is the process by which oxygen is moved into and carbon dioxide is moved into a cell.
✔ Answer: *Diffusion*
> Explanation: Oxygen enters the cell because it’s more concentrated outside (in the blood), and CO₂ exits because it’s more concentrated inside. Both move via diffusion.
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Each diagram shows a cell with:
- Water particles (H₂O)
- Sugar particles (represented as dark circles)
The arrows show the direction of water movement.
Let’s interpret each:
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#### Diagram A:
- Inside the cell: few sugar particles, many water particles.
- Outside: many sugar particles, fewer water particles.
- Water is moving into the cell.
- But there's no arrow showing water leaving → so net movement is into the cell.
→ Cell will swell (because water enters more than it leaves).
---
#### Diagram B:
- Equal number of sugar particles inside and outside.
- Water molecules are moving in and out at equal rates.
- No net change in water level.
→ Equilibrium — water moves in and out at same rate.
---
#### Diagram C:
- Inside the cell: high sugar concentration (many sugar particles).
- Outside: low sugar concentration (few sugar particles).
- Water is moving out of the cell.
- Arrows show water leaving.
→ Water leaves the cell, so the cell will shrink.
---
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9) In which diagram(s) does water move into and out of the cell at the same rate?
✔ Answer: B
> Explanation: Diagram B shows equal movement of water in and out — this is equilibrium.
---
10) In which diagram(s) will the cell begin to swell?
✔ Answer: A
> Explanation: In Diagram A, water is moving into the cell due to higher sugar concentration outside. This causes the cell to take in water and swell.
---
11) Which diagram(s) shows what would happen if a cell were placed in salt water?
✔ Answer: C
> Explanation: Salt water has a high concentration of solutes (salt). The cell’s interior has less salt, so water moves out of the cell to balance the concentration. This causes the cell to shrink (plasmolysis in plant cells, crenation in animal cells). Diagram C shows water leaving the cell.
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| Question | Answer |
|--------|--------|
| 1 | Concentration |
| 2 | Diffusion |
| 3 | A selectively permeable membrane |
| 4 | Osmosis |
| 5 | Diffusion |
| 6 | A selectively permeable membrane |
| 7 | Osmosis |
| 8 | Diffusion |
| 9 | B |
| 10 | A |
| 11 | C |
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- Diffusion: Movement of particles from high to low concentration.
- Osmosis: Diffusion of water across a selectively permeable membrane.
- Selectively permeable membrane: Allows only certain substances through.
- Concentration: Amount of substance in a space.
- Isotonic: Equal concentration → no net movement (Diagram B).
- Hypertonic: More solutes outside → water leaves cell (Diagram C).
- Hypotonic: More solutes inside → water enters cell (Diagram A).
Let me know if you’d like a labeled version of the diagrams!
---
Vocabulary Box:
- A selectively permeable membrane
- Diffusion
- Concentration
- Osmosis
---
Questions 1–8: Fill in the blanks
We’ll use the terms from the vocabulary box to answer these. Words can be used more than once.
---
1) ________________________ refers to the amount of a substance in a given space.
✔ Answer: *Concentration*
> Explanation: Concentration is how much of a substance (like sugar or salt) is present in a certain volume. For example, a high concentration means many particles in a small area.
---
2) ________________________ is the movement of particles from an area of higher concentration to an area of lower concentration.
✔ Answer: *Diffusion*
> Explanation: This is the definition of diffusion — particles move randomly and spread out until evenly distributed.
---
3) ________________________ allows some materials to pass through it but keeps other materials out.
✔ Answer: *A selectively permeable membrane*
> Explanation: This type of membrane lets only certain molecules (like water) pass through while blocking others (like large sugar molecules). Cell membranes are examples.
---
4) ________________________ is the diffusion of water molecules through a selectively permeable membrane.
✔ Answer: *Osmosis*
> Explanation: Osmosis is a special case of diffusion where water moves across a membrane from low solute concentration to high solute concentration.
---
5) ________________________ moves wastes from inside a cell to outside a cell.
✔ Answer: *Diffusion*
> Explanation: Waste products like carbon dioxide move out of cells via diffusion because their concentration is higher inside the cell than outside.
---
6) ________________________ can be compared to a window screen.
✔ Answer: *A selectively permeable membrane*
> Explanation: Just like a window screen allows air and small things through but blocks insects and larger objects, a selectively permeable membrane allows certain substances in and out.
---
7) ________________________ happens when water particles move from a place where their concentration is higher to a place where their concentration is lower.
✔ Answer: *Osmosis*
> Explanation: This describes osmosis — water moves down its concentration gradient (from high water concentration to low).
---
8) ________________________ is the process by which oxygen is moved into and carbon dioxide is moved into a cell.
✔ Answer: *Diffusion*
> Explanation: Oxygen enters the cell because it’s more concentrated outside (in the blood), and CO₂ exits because it’s more concentrated inside. Both move via diffusion.
---
Now, analyze Diagrams A, B, and C
Each diagram shows a cell with:
- Water particles (H₂O)
- Sugar particles (represented as dark circles)
The arrows show the direction of water movement.
Let’s interpret each:
---
#### Diagram A:
- Inside the cell: few sugar particles, many water particles.
- Outside: many sugar particles, fewer water particles.
- Water is moving into the cell.
- But there's no arrow showing water leaving → so net movement is into the cell.
→ Cell will swell (because water enters more than it leaves).
---
#### Diagram B:
- Equal number of sugar particles inside and outside.
- Water molecules are moving in and out at equal rates.
- No net change in water level.
→ Equilibrium — water moves in and out at same rate.
---
#### Diagram C:
- Inside the cell: high sugar concentration (many sugar particles).
- Outside: low sugar concentration (few sugar particles).
- Water is moving out of the cell.
- Arrows show water leaving.
→ Water leaves the cell, so the cell will shrink.
---
Questions 9–11: Use the diagrams
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9) In which diagram(s) does water move into and out of the cell at the same rate?
✔ Answer: B
> Explanation: Diagram B shows equal movement of water in and out — this is equilibrium.
---
10) In which diagram(s) will the cell begin to swell?
✔ Answer: A
> Explanation: In Diagram A, water is moving into the cell due to higher sugar concentration outside. This causes the cell to take in water and swell.
---
11) Which diagram(s) shows what would happen if a cell were placed in salt water?
✔ Answer: C
> Explanation: Salt water has a high concentration of solutes (salt). The cell’s interior has less salt, so water moves out of the cell to balance the concentration. This causes the cell to shrink (plasmolysis in plant cells, crenation in animal cells). Diagram C shows water leaving the cell.
---
✔ Final Answers:
| Question | Answer |
|--------|--------|
| 1 | Concentration |
| 2 | Diffusion |
| 3 | A selectively permeable membrane |
| 4 | Osmosis |
| 5 | Diffusion |
| 6 | A selectively permeable membrane |
| 7 | Osmosis |
| 8 | Diffusion |
| 9 | B |
| 10 | A |
| 11 | C |
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🔍 Summary of Key Concepts:
- Diffusion: Movement of particles from high to low concentration.
- Osmosis: Diffusion of water across a selectively permeable membrane.
- Selectively permeable membrane: Allows only certain substances through.
- Concentration: Amount of substance in a space.
- Isotonic: Equal concentration → no net movement (Diagram B).
- Hypertonic: More solutes outside → water leaves cell (Diagram C).
- Hypotonic: More solutes inside → water enters cell (Diagram A).
Let me know if you’d like a labeled version of the diagrams!
Parent Tip: Review the logic above to help your child master the concept of diffusion osmosis worksheet.
