Front

What is the difference between physical and chemical properties?

Back

Physical properties can be observed without changing the substance (e.g., color, mass), while chemical properties describe how a substance reacts with others (e.g., flammability, reactivity).

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 (e.g., cutting, melting).

Front

What is a chemical change?

Back

A chemical change occurs when a substance transforms into a different substance with different properties (e.g., rusting, burning).

Front

What evidence indicates a chemical change has occurred?

Back

Evidence of a chemical change includes color change, gas production (bubbles), temperature change, and formation of a precipitate.

Front

Is mass a reliable way to identify an unknown object?

Back

No, mass alone is not a reliable way to identify an unknown object because different substances can have the same mass.

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 in the new substance formed.

Front

What is an example of a physical change?

Back

Cutting a piece of paper is an example of a physical change because the paper remains paper.

Front

What is an example of a chemical change?

Back

Baking soda reacting with vinegar to produce carbon dioxide gas is an example of a chemical change.

Front

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

Back

Temperature change can indicate that a chemical reaction is occurring, often releasing or absorbing energy.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances where each retains its own properties (e.g., salad, air).