Chalk dissolves in water.

Explanation

**Step-by-Step Solution:**

1. **Identify the Main Component of Chalk:**
Chalk primarily consists of calcium carbonate, which is chemically represented as CaCO3.

2. **Understand the Properties of Calcium Carbonate:**
Calcium carbonate is known to have very low solubility in water. This means that when you add it to water, it does not dissolve well.

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