Figure 1: Water is a polar molecule.

Actually, there is no specific problem or question to solve in the image you uploaded.

The document titled “Water Molecule Model Building” is an educational reading passage designed to teach students about:

- The structure of a water molecule (H₂O)
- Why water is a polar molecule
- How hydrogen bonding leads to cohesion
- Why water is called the “greatest solvent on Earth” due to its ability to form hydration spheres around ions

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✔ What This Document Is For:

This is likely a worksheet or handout for a biology or chemistry class. It’s meant to be read and understood — possibly followed by questions, a model-building activity, or a quiz.

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📚 Key Concepts Explained (Summary):

#### 1. Polarity of Water (Figure 1)
- Oxygen has 8 protons → strong pull on shared electrons.
- Hydrogen has only 1 proton → weak pull.
- Result: Electrons spend more time near oxygen → oxygen becomes slightly negative (δ⁻), hydrogens become slightly positive (δ⁺).
- This uneven charge distribution = polar molecule.

#### 2. Hydrogen Bonding & Cohesion (Figure 2)
- The δ⁺ hydrogen of one water molecule is attracted to the δ⁻ oxygen of another.
- This attraction = hydrogen bond.
- Many such bonds → cohesion (water molecules stick together).
- Explains surface tension, capillary action in plants, etc.

#### 3. Water as a Solvent (Figure 3)
- Water dissolves ionic compounds like NaCl (table salt).
- Na⁺ attracts the δ⁻ oxygen side of water.
- Cl⁻ attracts the δ⁺ hydrogen side of water.
- Water molecules surround each ion → forms a hydration sphere.
- If water evaporates, ions recombine into crystals.

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🧪 If You Were Supposed to “Solve” Something…

Since no explicit question was asked in the image, here are some common follow-up questions that might go with this worksheet — and their answers:

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#### ❓ Question: Why is water called a polar molecule?
✔ Answer: Because the oxygen atom pulls electrons more strongly than hydrogen atoms, creating a slight negative charge on the oxygen end and slight positive charges on the hydrogen ends — an uneven distribution of charge.

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#### ❓ Question: What is a hydrogen bond? How does it affect water’s properties?
✔ Answer: A hydrogen bond is an attraction between the slightly positive hydrogen of one water molecule and the slightly negative oxygen of another. It causes cohesion, which gives water high surface tension, allows capillary action, and helps transport water in plants.

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#### ❓ Question: How does water dissolve salt (NaCl)?
✔ Answer: Water molecules surround Na⁺ and Cl⁻ ions. The negative (oxygen) side of water faces Na⁺; the positive (hydrogen) side faces Cl⁻. This separates the ions and keeps them dissolved — forming hydration spheres.

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📝 Suggested Next Steps:

If you’re using this for homework or class:
- Fill in your Name(s) and Date at the top.
- Read through the text carefully.
- Study Figures 1–3.
- Answer any unseen questions that may accompany this sheet (often printed on the back or given separately).

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✔ Final Note: There’s no math problem or puzzle to solve — just a foundational science lesson on water’s unique properties. If you have specific questions *about* this material (e.g., “What happens if we add sugar instead of salt?”), feel free to ask!

Let me know if you’d like a quiz based on this passage!