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. Examples include hydrogen (H), oxygen (O), and carbon (C).

Front

What is a compound?

Back

A compound is a substance formed when two or more 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. Examples include air, salad, and sand and salt.

Front

What is a molecule?

Back

A molecule is the smallest unit of a chemical compound that retains its chemical properties. It can consist of two or more atoms bonded together.

Front

Can a molecule be made of the same kind of atoms?

Back

Yes, a molecule can be made of the same kind of atoms, such as O2 (oxygen gas) which consists of two oxygen atoms.

Front

What is the difference between an element and a compound?

Back

An element is a single type of atom, while a compound is made up of two or more different types of atoms chemically bonded together.

Front

What is an atom?

Back

An atom is the basic unit of a chemical element. It consists of a nucleus surrounded by electrons.

Front

What are the three states of matter?

Back

The three states of matter are solid, liquid, and gas. Each state has distinct properties.

Front

What is a solid?

Back

A solid is a state of matter that has a definite shape and volume. The particles are closely packed together.

Front

What is a liquid?

Back

A liquid is a state of matter that has a definite volume but takes the shape of its container. The particles are close but can move past each other.