Osmosis diagram showing water molecule movement through a selectively permeable membrane, with labeled parts and instructions for illustrating equilibrium.

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🔹 Worksheet Overview: Osmosis

Definition:
*Osmosis is a form of ________ that involves the movement of H₂O molecules from an area of ________ concentration to an area of ________ concentration. This helps to ________ out the difference inside of a cell.*

Words to Use:
- water
- low
- balance
- high
- diffusion

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✔ Step 1: Fill in the Blanks

Let’s complete the definition using the correct terms:

> Osmosis is a form of *diffusion* that involves the movement of H₂O molecules from an area of *low* concentration to an area of *high* concentration. This helps to *balance* out the difference inside of a cell.

✔ Explanation:
- Osmosis is a type of diffusion (passive transport) specifically for water.
- Water moves from areas of low solute concentration to areas of high solute concentration.
- This movement helps balance the concentration on both sides of the membrane.

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🔹 Diagram Key Instructions

There are two diagrams labeled 1 and 2, showing water molecules and solute molecules separated by a selectively permeable membrane.

#### Key for Diagram:

1. Draw in the molecule on the right-hand side of the selectively permeable membrane, showing a lower concentration of water molecules compared to the left-hand side.
- This means the right side has more solute (so fewer water molecules).
- So, draw fewer water molecules on the right side than on the left.

2. Draw an arrow to show the direction of the concentration gradient.
- The concentration gradient for water goes from high water concentration to low water concentration.
- Since the left side has more water (lower solute), water will move from left to right.
- Draw an arrow pointing from left to right across the membrane.

3. How do we draw water molecules on both sides of the selectively permeable membrane to show that equilibrium has been reached due to osmosis?
- At equilibrium, the concentration of water is equal on both sides.
- So, draw equal numbers of water molecules on both sides.
- The net movement stops — no more net flow.

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✔ Final Answers:

#### Fill-in-the-blank Answer:
> Osmosis is a form of diffusion that involves the movement of H₂O molecules from an area of low concentration to an area of high concentration. This helps to balance out the difference inside of a cell.

#### Diagram Instructions:
1. On the right side, draw fewer water molecules (more solutes).
2. Draw an arrow pointing from left to right (direction of water movement).
3. For equilibrium: Draw equal numbers of water molecules on both sides.

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🧠 Concept Summary:

- Osmosis: Movement of water across a semi-permeable membrane.
- Direction: From low solute concentration → high solute concentration.
- Purpose: To equalize solute concentrations on both sides.
- Equilibrium: When water levels are balanced, no net movement occurs.

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