Elements, Compounds and Mixtures

Front

What is 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 are chemically bonded together in a fixed ratio.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded and retain their individual properties.

Front

What distinguishes a homogeneous mixture from a heterogeneous mixture?

Back

A homogeneous mixture has a uniform composition throughout, while a heterogeneous mixture has a non-uniform composition with distinct phases.

Front

What is an example of a pure substance?

Back

A balloon filled with helium is an example of a pure substance.

Front

What happens when electricity passes through water?

Back

When electricity passes through water, it breaks down into hydrogen and oxygen, which are elements.

Front

Why is saltwater considered a mixture?

Back

Saltwater is considered a mixture because it is composed of two or more substances (salt and water) that retain their own chemical properties.

Front

Is water (H2O) found on the periodic table?

Back

No, water (H2O) is not found on the periodic table because it is a compound, not an element.

Front

What is the difference between a compound and a mixture?

Back

A compound is made of two or more elements chemically combined, while a mixture is made of two or more substances that are physically combined.

Front

Can elements be broken down into simpler substances?

Back

No, elements cannot be broken down into simpler substances by chemical means.