Element Compound Mixture Test

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. For example, water (H2O) is a compound made of hydrogen and oxygen.

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

How many atoms are in a molecule of water (H2O)?

Back

A molecule of water contains 2 hydrogen atoms and 1 oxygen atom.

Front

What is the chemical formula for carbon dioxide?

Back

The chemical formula for carbon dioxide is CO2, which consists of 1 carbon atom and 2 oxygen atoms.

Front

How many oxygen atoms are in the molecule (OH)2?

Back

There are 2 oxygen atoms in the molecule (OH)2.

Front

What is the difference between a compound and a mixture?

Back

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

Front

How many aluminum atoms are in Al2(SO4)3?

Back

There are 2 aluminum atoms in Al2(SO4)3.

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 that does not have a uniform composition, such as a salad.