Al Dhafra Private Schools, Al Ain
Facility of Science / Department of chemistry
Academic Year of 2022 – 2023
Grade 8 – Term 1
Revision Sheet from Grade 7 - Naming Compounds
Name: ___________________
Date: _________________
Section: ______
There are two types of compounds:
1) Ionic compounds  metal + non-metal
2) covalent compounds  non-metal + non-metal
What type of compound would two metals make?!
Naming compounds
 Ionic compounds (metal + non-metal)
To name an ionic compound:
Step 1: Write down the name of the metal first.
Step 2: Writ down the name of the non-metal with changing the end into –ide.
Note: if polyatomic ions (ex. Carbonate ion CO32-) are involved in the ionic
compound, do not change their names.
These are the most common that you MUST memorize :
Q1: Classify the compounds below into ionic and covalent compounds
Water – potassium hydroxide – CO2 – sodium nitrate – ammonium chloride
phosphorus tribromide – iron sulfate
Ionic compounds
Covalent compounds
Examples of naming ionic compounds:
1. KF
Potassium fluoride
2. CaS
Calcium sulfide
3. Mg(NO3)2
Magnesium nitrate
Q2: Name the compounds made up from the combination of the elements below:
A. Magnesium and oxygen
B. Calcium and sulfur
C. Aluminum and chlorine
D. Sodium and bromine
Q3: Write down the name of the compounds below
A. NaCl
E. MgBr2
B. NaOH
F. NaI
C. Na2SO4
G. Ca(NO3)2
D. CaSO4
H. Mg(OH)2
 Covalent compound
To name covalent compounds, we will be using
prefix shown in the table.
Step 1: identify the elements present.
Step 2: look at the subscript of each element
to determine which prefix to use.
Step 3: Write down the prefix followed by the
first non-metal as it is (Note: If only one atom
of the first nonmetal, do not use the prefix
“mono-”.
Step 4: Write down the prefix followed by the
second non-metal and change the end into –
ide.
Examples
CH4
carbon tetrahydride
NH3
nitrogen trihydride
H2O
dihydrogen monoxide
Q5: Write the names for the following covalent compounds:
a) P4S5
h) BF3
b) Si2Br6
i) P2Br4
j) CO
c) SCl4
k) SiO2
d) B2Si
e) NF
f) N2S
g) PH3
l) SF6
m) NH3
n) NO2