Osmosis Worksheet: Analyze water movement in animal cells placed in beakers with different solute concentrations.

Let's solve this Osmosis Worksheet step by step. The goal is to:

1. Draw an arrow showing the direction of water movement by osmosis.
2. Fill in any missing percentages (water or solute).
3. Identify the type of solution: isotonic, hypertonic, or hypotonic.

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🔍 Key Concepts:

- Osmosis: Water moves from an area of lower solute concentration to an area of higher solute concentration through a semi-permeable membrane.
- Isotonic: Equal solute concentrations inside and outside → no net movement of water.
- Hypertonic: Higher solute concentration outside → water moves out of the cell → cell shrinks.
- Hypotonic: Lower solute concentration outside → water moves into the cell → cell swells.

> Remember: Water moves toward higher solute concentration.

Also, water % + solute % = 100% in each beaker and cell.

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Let’s go through each diagram one by one.

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🟦 Beaker 1

```
Cell: 90% H₂O, 10% solute
Beaker: 85% H₂O, 15% solute
```

- Solute comparison: Cell has 10%, Beaker has 15% → Beaker is more concentrated
- Water moves from cell to beaker (into the beaker)
- Arrow: ➡️ from cell to beaker
- Solution type: Hypertonic (outside has more solute)

✔ Answer:
- Arrow: ➡️ (out of cell)
- Type: Hypertonic

---

🟦 Beaker 2

```
Cell: 40% H₂O, 60% solute
Beaker: 90% H₂O, 10% solute
```

- Cell: 60% solute → very high
- Beaker: 10% solute → low
- Water moves into the cell (from beaker to cell)
- Arrow: ➡️ into the cell
- Solution type: Hypotonic (outside has less solute)

✔ Answer:
- Arrow: ⬅️ (into cell)
- Type: Hypotonic

---

🟦 Beaker 3

```
Cell: 75% H₂O, 25% solute
Beaker: 80% H₂O, 20% solute
```

- Cell: 25% solute
- Beaker: 20% solute → lower than cell
- So, water moves into the cell (toward higher solute)
- Arrow: ➡️ into cell
- Type: Hypotonic

✔ Answer:
- Arrow: ⬅️
- Type: Hypotonic

---

🟦 Beaker 4

```
Cell: 45% H₂O, 55% solute
Beaker: 75% H₂O, 25% solute
```

- Cell: 55% solute
- Beaker: 25% solute → much lower
- Water moves into the cell
- Arrow: ➡️ into cell
- Type: Hypotonic

✔ Answer:
- Arrow: ⬅️
- Type: Hypotonic

---

🟦 Beaker 5

```
Cell: 90% H₂O, 10% solute
Beaker: 63% H₂O, 37% solute
```

- Cell: 10% solute
- Beaker: 37% solute → higher
- Water moves out of cell
- Arrow: ➡️ out of cell
- Type: Hypertonic

✔ Answer:
- Arrow: ➡️
- Type: Hypertonic

---

🟦 Beaker 6

```
Cell: 50% H₂O, 50% solute
Beaker: 50% H₂O, 50% solute
```

- Same solute concentration → no net movement
- Arrow: ↔️ or none (but usually draw no arrow or a balanced one)
- Type: Isotonic

✔ Answer:
- Arrow: None (or ↔️)
- Type: Isotonic

---

🟦 Beaker 7

```
Cell: 90% H₂O, 10% solute
Beaker: 90% H₂O, 10% solute
```

- Identical concentrations
- No net movement
- Arrow: None
- Type: Isotonic

✔ Answer:
- Arrow: None
- Type: Isotonic

---

🟦 Beaker 8

```
Cell: 82% H₂O, 18% solute
Beaker: 25% H₂O, 75% solute
```

- Cell: 18% solute
- Beaker: 75% solute → much higher
- Water moves out of cell
- Arrow: ➡️ out of cell
- Type: Hypertonic

✔ Answer:
- Arrow: ➡️
- Type: Hypertonic

---

🟦 Beaker 9

```
Cell: 90% H₂O, 10% solute
Beaker: 80% H₂O, 20% solute
```

- Cell: 10% solute
- Beaker: 20% solute → higher
- Water moves out of cell
- Arrow: ➡️ out of cell
- Type: Hypertonic

✔ Answer:
- Arrow: ➡️
- Type: Hypertonic

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✔ Summary Table

| Beaker | Cell Solute | Beaker Solute | Water Movement | Solution Type |
|--------|-------------|---------------|----------------|----------------|
| 1 | 10% | 15% | Out of cell | Hypertonic |
| 2 | 60% | 10% | Into cell | Hypotonic |
| 3 | 25% | 20% | Into cell | Hypotonic |
| 4 | 55% | 25% | Into cell | Hypotonic |
| 5 | 10% | 37% | Out of cell | Hypertonic |
| 6 | 50% | 50% | None | Isotonic |
| 7 | 10% | 10% | None | Isotonic |
| 8 | 18% | 75% | Out of cell | Hypertonic |
| 9 | 10% | 20% | Out of cell | Hypertonic |

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📝 Final Instructions for Student:

1. Draw arrows:
- Into cell: when beaker is hypotonic (less solute)
- Out of cell: when beaker is hypertonic (more solute)
- No arrow: if isotonic

2. Missing percentages?
- All values are already given; no missing data to fill in.

3. Label each as:
- Isotonic, Hypotonic, or Hypertonic

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✔ Final Answers (for each beaker):

1. Arrow: ➡️ out → Hypertonic
2. Arrow: ⬅️ in → Hypotonic
3. Arrow: ⬅️ in → Hypotonic
4. Arrow: ⬅️ in → Hypotonic
5. Arrow: ➡️ out → Hypertonic
6. Arrow: None → Isotonic
7. Arrow: None → Isotonic
8. Arrow: ➡️ out → Hypertonic
9. Arrow: ➡️ out → Hypertonic

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Let me know if you'd like a visual version with arrows drawn or a printable answer key!