Chemistry

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded together. Examples include air, salad, and sand and salt.

Front

What is an element?

Back

An element is a pure substance that consists of only one type of atom. Examples include hydrogen (H), oxygen (O), and gold (Au).

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together. Examples include water (H2O) and carbon dioxide (CO2).

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element. It consists of protons, neutrons, and electrons.

Front

What is the mass number of an atom?

Back

The mass number of an atom is the total number of protons and neutrons in its nucleus.

Front

How many protons does an atom of aluminum have?

Back

An atom of aluminum has 13 protons.

Front

What is the charge of a neutron?

Back

A neutron has no charge; it is neutral.

Front

What is the charge of an electron?

Back

An electron has a negative charge.

Front

What is the difference between an element and a compound?

Back

An element consists of only one type of atom, while a compound consists of two or more different types of atoms chemically bonded together.

Front

What is a chemical bond?

Back

A chemical bond is the force that holds atoms together in a compound. There are two main types: ionic bonds and covalent bonds.