8.p.9.2 Physical vs Chemical Changes

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 melting, freezing, 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 includes processes like burning, rusting, and cooking.

Front

Is melting butter a physical or chemical change?

Back

Melting butter is a physical change because it changes the state of the butter from solid to liquid without changing its chemical composition.

Front

What happens to the mass of a substance during a chemical reaction?

Back

The mass of a substance can change during a chemical reaction, especially if gases are produced or consumed. For example, if gas escapes, the mass decreases.

Front

What is an indicator of a chemical change?

Back

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

Front

What occurs when baking soda is mixed with vinegar?

Back

When baking soda is mixed with vinegar, a chemical reaction occurs, producing carbon dioxide gas, which causes fizzing and foaming.

Front

Is burning paper a physical or chemical change?

Back

Burning paper is a chemical change because it transforms the paper into ash and gases, creating new substances.

Front

What is an example of a chemical change in a car engine?

Back

Using gasoline in a car engine is a chemical change because it involves a reaction that produces energy and exhaust gases.

Front

What does the formation of bubbles indicate in a chemical reaction?

Back

The formation of bubbles indicates that a gas is being produced, which is a sign of a chemical change.

Front

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

Back

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