Elements, Compounds, 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 different 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 can be separated by physical means.

Front

Are mixtures chemically combined?

Back

No, mixtures are not chemically combined; they retain their individual properties.

Front

What is the difference between a homogeneous mixture and 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

Can compounds be separated into their constituent elements?

Back

Yes, compounds can be separated into their constituent elements through chemical reactions.

Front

Give an example of an element.

Back

An example of an element is oxygen (O), which is essential for respiration.

Front

Give an example of a compound.

Back

An example of a compound is water (H2O), which consists of two hydrogen atoms and one oxygen atom.

Front

Give an example of a mixture.

Back

An example of a mixture is air, which contains various gases like nitrogen, oxygen, and carbon dioxide.

Front

What is the law of definite proportions?

Back

The law of definite proportions states that a chemical compound always contains its component elements in fixed ratio by mass.