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A cold glass of lemonade develops drops of water collecting on the outside of the glass on a hot summer day.  Would this observation be an example of a physical change occuring, a chemical change occuring, or no change at all?

Question

A cold glass of lemonade develops drops of water collecting on the outside of the glass on a hot summer day.  Would this observation be an example of a physical change occuring, a chemical change occuring, or no change at all?

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Solution

This observation is an example of a physical change occurring. Here's why:

  1. The process you're observing is called condensation. It happens when water vapor in the warm air comes into contact with the cold glass of lemonade.

  2. The warm air around the glass can't hold as much moisture when it's cooled down by the glass, so the excess water vapor turns back into liquid water. This is what forms the drops of water on the outside of the glass.

  3. This is a physical change, not a chemical one, because the water is still water, whether it's in the form of a liquid or a gas. It hasn't changed into a different substance.

  4. In a chemical change, the original substance is transformed into a new substance with different properties. That's not what's happening here. The water is just changing from one state (gas) to another (liquid).

So, the formation of water droplets on the outside of a cold glass of lemonade on a hot day is a physical change.

This problem has been solved

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