Evidence of a Chemical Change Review

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances with different properties.

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is a precipitate?

Back

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

Front

What happens to invisible ink when heated?

Back

When heated, invisible ink (like lemon juice) undergoes a chemical change and becomes visible, as it turns brown.

Front

Give an example of a chemical change.

Back

Frying an egg is an example of a chemical change because it transforms the egg's proteins.

Front

What indicates a new substance has formed in a reaction?

Back

The formation of a solid, gas, or color change indicates that a new substance has formed.

Front

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

Back

A chemical change results in new substances, while a physical change does not change the substance's chemical identity.

Front

What is an example of a physical change?

Back

Crushing a can is an example of a physical change because the material remains the same.

Front

What is the significance of color change in a chemical reaction?

Back

A color change can indicate that a chemical reaction has occurred and a new substance may have formed.

Front

What does it mean when a solid settles to the bottom of a mixture?

Back

It often indicates that a precipitate has formed, suggesting a chemical change has occurred.