atoms and molecules practice

Front

What is the smallest unit of matter?

Back

An atom is the smallest unit of matter that retains the properties of an element.

Front

What is a molecule?

Back

A molecule is formed when two or more atoms chemically bond together.

Front

What is the chemical formula for water?

Back

The chemical formula for water is H2O.

Front

What are the three main parts of an atom?

Back

The three main parts of an atom are protons, neutrons, and electrons.

Front

What charge do protons have?

Back

Protons have a positive charge.

Front

What charge do electrons have?

Back

Electrons have a negative charge.

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together.

Front

How many atoms are in a molecule of O2?

Back

There are 2 atoms in a molecule of O2.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms.

Front

What is the chemical formula for sodium bicarbonate?

Back

The chemical formula for sodium bicarbonate is NaHCO3.