Which of the following is a chemical change ?

Options

A. Lifting up a chair
B. Filling a glass with orange juice
C. Cooking a pot of rice
D. Bursting a balloon

Answer

To determine which of the following options represents a chemical change, let's analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding Chemical Change**:
- A chemical change is a process where new substances are formed. This involves breaking and forming bonds between atoms, resulting in a change in the chemical composition of the substances involved.

2. **Analyzing the Options**:
- **Option 1: Lifting a chair**:
- When you lift a chair, you are merely changing its position. There is no change in the chemical composition of the chair; thus, this is a **physical change**.

- **Option 2: Filling a glass with orange juice**:
- Filling a glass with orange juice involves pouring the juice into a glass. The juice remains the same substance (orange juice) before and after pouring. Therefore, this is also a **physical change**.

- **Option 3: Cooking a pot of rice**:
- When rice is cooked, the heat causes the starch molecules in the rice to break down and transform into smaller, digestible molecules. This process involves a chemical reaction, resulting in the formation of new substances. Hence, this is a **chemical change**.

- **Option 4: Bursting a balloon**:
- Bursting a balloon involves a physical action where the balloon material tears apart, but the chemical composition of the material does not change. Thus, this is a **physical change**.

3. **Conclusion**:
- Among the options analyzed, **Option 3: Cooking a pot of rice** is the only process that represents a **chemical change** as it results in the formation of new substances.

### Final Answer:
The correct option that represents a chemical change is **Option 3: Cooking a pot of rice**.

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