What is a molecule
A group of atoms joined together. It is the smallest particle of an element or compound that can exists indepently
What is a chemical formula
Represent a compound or a molecule of a compound
Hydrogen chloride
Covalent : HCl
Water
Covalent: H2O
Methane
Covalent: CH4
Carbon dioxide
Covalent: CO2
Hydrogen peroxide
Covalent:H2O2
Sodium chloride
Ionic: NaCl
Magnesium oxide
MgO
Iron sulfide
FeS
Calcium chloride
CaCl2
Copper sulfate
CuSO4
Calcium carbonate
CaCO3
Magnanese dioxide
MnO2
Sodium hydroxide
NaOH
Calcium hydroxide
Ca (OH)2