Elements, Compounds, Mixtures, & Counting atoms

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. The individual substances retain their own 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, separate components.

Front

What is the chemical formula for water?

Back

H2O

Front

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

Back

There are 3 atoms in one molecule of water: 2 hydrogen atoms and 1 oxygen atom.

Front

What is the atomic symbol for hydrogen?

Back

H

Front

What is the atomic symbol for oxygen?

Back

O

Front

What type of matter is represented by the symbol 'NaCl'?

Back

NaCl is a compound known as sodium chloride, or table salt.

Front

What is a pure substance?

Back

A pure substance is a material that has a constant composition and consistent properties throughout. It can be an element or a compound.