1.1 Chemical and physical properties and changes

Front

What is a chemical property?

Back

A characteristic of a substance that can only be observed during a chemical reaction, such as reactivity, flammability, or acidity.

Front

What is a physical property?

Back

A characteristic of a substance that can be observed or measured without changing the substance's identity, such as color, boiling point, or density.

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition, such as melting ice or dissolving sugar in water.

Front

What is a chemical change?

Back

A change that results in the formation of new chemical substances, such as rusting iron or burning wood.

Front

What is the difference between intensive and extensive properties?

Back

Intensive properties do not depend on the amount of substance present (e.g., density), while extensive properties do depend on the amount of substance (e.g., mass, volume).

Front

Give an example of a chemical property.

Back

Radioactivity is an example of a chemical property.

Front

Give an example of a physical change.

Back

Melting ice is an example of a physical change.

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What can chemical properties be recognized through?

Back

Chemical properties can only be recognized when substances react or do not react chemically with one another.

Front

What is density?

Back

Density is the mass of a substance divided by its volume, and it is an intensive property.

Front

What happens during a chemical change?

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During a chemical change, the original substances are transformed into one or more new substances with different properties.