Physical and Chemical Properties and 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 cutting.

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 can be identified by changes such as color change, gas production, or the formation of a precipitate.

Front

Is breaking glass a chemical or physical change?

Back

Breaking glass is a physical change because it alters the shape and size of the glass without changing its chemical composition.

Front

What evidence indicates a chemical change has occurred?

Back

Evidence of a chemical change includes the formation of gas bubbles, color change, temperature change, and the production of an odor.

Front

What happens during a physical change?

Back

During a physical change, the form of a substance changes, but its chemical identity remains the same.

Front

Is cutting hair a physical or chemical change?

Back

Cutting hair is a physical change because it changes the length of the hair without altering its chemical structure.

Front

What is an example of a chemical change?

Back

An example of a chemical change is the rotting of fruit, which produces a bad smell and changes the fruit's chemical composition.

Front

What is melting? Is it a physical or chemical change?

Back

Melting is a physical change where a solid turns into a liquid, such as butter melting for popcorn.

Front

What is a physical property?

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A physical property is a characteristic of a substance that can be observed or measured without changing its chemical identity, such as color, mass, and volume.

Front

What is a chemical property?

Back

A chemical property is a characteristic that can only be observed during a chemical reaction, such as reactivity with acids or flammability.