Questions: 7. What characteristic best describes what happen during a physical change?

Solution Steps

A physical change involves a change in the physical properties of a substance without altering its chemical composition. This means that the substance itself remains the same at the molecular level, even though its form or appearance might change.

During a physical change, the following characteristics are typically observed:

• Change in state (e.g., solid to liquid, liquid to gas)
• Change in shape or size
• Reversible changes (in many cases)
• No new substances are formed

The best characteristic that describes a physical change is that the chemical composition of the substance remains unchanged. This is the key factor that differentiates physical changes from chemical changes, where the chemical composition is altered.

Final Answer