State whether the following statements are true or false: Breaking down of ozone (a gas) is a chemical change.

Explanation

To determine whether the statement "Breaking down of ozone (a gas) is a chemical change" is true or false, we can follow these steps:

### Step 1: Understand what ozone is
Ozone is a molecule composed of three oxygen atoms, represented as O3.

### Step 2: Analyze the breakdown of ozone
When ozone breaks down, it decomposes into oxygen gas, which is represented as O2.

### Step 3: Compare the chemical properties
Both ozone (O3) and oxygen (O2) have similar chemical properties because they are both forms of oxygen. However, the key point here is that the breakdown of ozone does not result in a change in the chemical properties of the elements involved.

### Step 4: Determine the type of change
In a chemical change, the chemical properties of the original substance change, resulting in the formation of a new substance with different chemical properties. Since the breakdown of ozone into oxygen does not change the chemical properties (they remain as forms of oxygen), it is classified as a physical change.

### Step 5: Conclusion
Since the breakdown of ozone does not result in a change of chemical properties, the statement "Breaking down of ozone (a gas) is a chemical change" is **false**.

### Final Answer
The statement is **false**.

---