Elements, Compounds, and Mixtures

Front

What is the particle theory of matter?

Back

The particle theory of matter states that all matter is made up of tiny particles that are in constant motion. Different substances are made of different types of particles.

Front

Define an element.

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. It consists of only one type of atom.

Front

What is a compound?

Back

A compound is a substance formed when two or more elements chemically bond together in fixed proportions.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded and can be separated by physical means.

Front

Give an example of a homogeneous mixture.

Back

An example of a homogeneous mixture is saltwater, where the salt is evenly distributed throughout the water.

Front

Give an example of a heterogeneous mixture.

Back

An example of a heterogeneous mixture is a salad, where the individual ingredients can be seen and separated.

Front

Can compounds be broken down into simpler substances?

Back

Yes, compounds can be broken down into simpler substances through chemical reactions.

Front

Is air a compound or a mixture?

Back

Air is a mixture because it contains various gases (like nitrogen, oxygen, carbon dioxide) that are not chemically bonded.

Front

What distinguishes a compound from a mixture?

Back

A compound has a fixed composition and specific properties, while a mixture has variable composition and retains the properties of its individual components.

Front

What is the chemical formula for sugar?

Back

The chemical formula for sugar is C12H22O11.