Physical and Chemical Changes Flashcard

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. Examples include cutting, melting, and dissolving.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and the rearrangement of atoms. Examples include rusting, burning, and reacting with acids.

Front

Is energy destroyed during heat transfer?

Back

False. Energy cannot be created or destroyed; it can only be transformed from one form to another.

Front

What happens when an apple is cut?

Back

This is a physical change because the apple's chemical composition remains the same, even though its shape and size change.

Front

What occurs when NaCl dissolves in water?

Back

This is a physical change because the salt can be recovered by evaporating the water, and its chemical composition remains unchanged.

Front

What is an example of a chemical reaction?

Back

Baking soda reacting with vinegar is a chemical reaction that produces carbon dioxide gas, water, and sodium acetate.

Front

What happens to a marshmallow when toasted over a campfire?

Back

Toasting a marshmallow is a chemical change because it alters the chemical structure of the marshmallow, resulting in a different flavor and texture.

Front

What is the difference between a physical and chemical change?

Back

A physical change does not change the chemical composition of a substance, while a chemical change results in the formation of new substances.

Front

Can physical changes be reversed?

Back

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

Front

Can chemical changes be reversed?

Back

Chemical changes are often not easily reversible, as they involve the formation of new substances.