Elements and Compounds

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 oxygen (O), gold (Au), and hydrogen (H).

Front

What is a compound?

Back

A compound is a substance formed when two or more elements chemically bond together. Examples include water (H2O) and sodium chloride (NaCl).

Front

What is the chemical symbol for Calcium?

Back

Ca

Front

How many elements are in the compound NaCl?

Back

2 (Sodium and Chlorine)

Front

How many elements are in the compound H2O?

Back

2 (Hydrogen and Oxygen)

Front

What is the difference between an element and a compound?

Back

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

Front

What is the chemical formula for water?

Back

H2O

Front

What is the chemical formula for table salt?

Back

NaCl

Front

What does the subscript in a chemical formula indicate?

Back

The subscript indicates the number of atoms of the element in the compound. For example, in H2O, the '2' means there are two hydrogen atoms.

Front

What is the symbol for Oxygen?

Back

O