Question

question 1
matter can go through two types of changes: physical changes and chemical
changes. chemical changes result in new substances, while physical changes
do not. which process is an example of a physical change?
apple juice turning into vinegar
rock being crushed into gravel
paper burning into ash
dough being baked into bread

Explanation:

• Apple juice turning into vinegar: This is a chemical change as new substances (like acetic acid in vinegar) are formed through fermentation.
• Rock being crushed into gravel: Here, only the size and shape of the rock change. No new substances are formed. It is a physical change.
• Paper burning into ash: Burning is a chemical reaction. New substances (ash, carbon - dioxide, etc.) are formed.
• Dough being baked into bread: Baking involves chemical reactions (e.g., yeast fermentation, Maillard reactions). New substances are formed.

Answer:

rock being crushed into gravel