Less sugar is visible. The water is cloudy. The sugar turned into crystals. Bubbles formed in the water.
I gave my students this multiple choice question: Sugar is added to water and the mixture is stirred. Which observation is evidence that the sugar dissolved in the water?

Only one answer is correct among these 4 choices:
- Less sugar is visible.
- The water is cloudy.
- The sugar turned into crystals.
- Bubbles formed in the water.

Could you tell me which one is correct?

Less sugar is visible.