Chemical vs. Physical Changes

Front

What is the difference between a chemical change and a physical change?

Back

A chemical change results in the formation of new substances with different properties, while a physical change alters the form or appearance of a substance without changing its chemical composition.

Front

What is an example of a physical change?

Back

Blending fruits together is an example of a physical change.

Front

What is an example of a chemical change?

Back

The spoiling of milk is an example of a chemical change.

Front

What happens to the properties of a substance during a chemical change?

Back

The properties of the original substance change, and new properties emerge as new substances are formed.

Front

What is a flame test used for?

Back

A flame test is used to identify the presence of certain gases, such as hydrogen.

Front

What is the significance of gallium melting in terms of physical changes?

Back

Gallium melting is a physical change because it changes from solid to liquid but remains gallium, a metal.

Front

Is mixing air into egg whites a physical or chemical change?

Back

Mixing air into egg whites is a physical change.

Front

What are some indicators of a chemical change?

Back

Indicators of a chemical change include color change, temperature change, gas production, and the formation of a precipitate.

Front

Can a physical change be reversed?

Back

Many physical changes can be reversed, such as freezing and melting, but some may not be easily reversible.

Front

What is a precipitate?

Back

A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.