Physical and Chemical Changes #2

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 changes in state (like melting or boiling), shape, or size.

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 changes the molecular structure of the substance. Examples include burning, rusting, and digestion.

Front

Is boiling water a physical or chemical change?

Back

Boiling water is a physical change because it changes the state of water from liquid to gas without changing its chemical composition.

Front

Is bending metal a physical or chemical change?

Back

Bending metal is a physical change because it alters the shape of the metal without changing its chemical structure.

Front

What happens when paper is ripped?

Back

Ripping paper is a physical change because the paper's physical form is altered, but its chemical composition remains the same.

Front

What is an example of a chemical change?

Back

An example of a chemical change is the burning of a candle, where the wax undergoes a chemical reaction to produce heat, light, carbon dioxide, and water.

Front

What are 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

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

Back

A physical change affects the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances with different properties.

Front

Can physical changes be reversed?

Back

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

Front

Can chemical changes be reversed?

Back

Chemical changes are often not easily reversible. For example, burning wood creates ash and gases that cannot be turned back into wood.