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 different types of atoms bond together chemically. Examples include water (H2O) and carbon dioxide (CO2).

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded. Each substance retains its own properties.

Front

Give an example of an element.

Back

Examples of elements include oxygen (O), hydrogen (H), carbon (C), and gold (Au).

Front

Give an example of a compound.

Back

Examples of compounds include sodium chloride (NaCl), which is table salt, and glucose (C6H12O6).

Front

Give an example of a mixture.

Back

Examples of mixtures include air (a mixture of gases) and salad (a mixture of various vegetables).

Front

What is the difference between a compound and a mixture?

Back

A compound is a substance formed from two or more elements that are chemically bonded, while a mixture is a combination of substances that are not chemically bonded.

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture that has a uniform composition throughout, such as saltwater.

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture is a mixture where the components can be seen and are not uniform, such as a salad or a mixture of sand and iron filings.

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.