Elements, Molecules 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. It consists of only one type of atom.

Front

How many different elements are in the compound Fe3O4?

Back

2

Front

What is a compound?

Back

A compound is a substance formed by the chemical combination of two or more different elements.

Front

Which of the following is an example of an element? H2O, CH4, CO2, Na

Back

Na

Front

How many atoms are in the compound CH4?

Back

5

Front

What is the chemical formula for table salt?

Back

NaCl

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together, which can be of the same or different elements.

Front

What is the difference between an element and a compound?

Back

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

Front

What is the chemical formula for water?

Back

H2O

Front

What does the subscript in a chemical formula indicate?

Back

The subscript indicates the number of atoms of the element in the molecule.