+1-315-636-4485
+91 98151-74050 
In this quiz, you will get to know about atoms, molecules, and their chemical representations. You will find problems on identifying the elementary substances and compounds. We have represented all the atoms and compounds by their molecular diagram for a better understanding.
Select the chemical formula for this molecule.
H2S
HS
C2HS
Select the chemical formula for this molecule.
H2O
H2O2
HO2
How many hydrogen atoms are present in the molecular formula shown?
2
3
4
How many fluorine atoms are there?
4
1
2
Ethane is used to make plastic bags. The chemical formula for ethane is C2H6.
Complete the statement.
Ethane is ##a compound##.
Argon is a gas used to protect important documents, including the United States Constitution, from decay. The chemical formula for argon is Ar.
Complete the statement.
Argon is ##an elementary substance##.
Select the two elementary substances.
bromomethane (CH3Br)
argon (Ar)
silicon dioxide (SiO2)
ruthenium (Ru)
The model below represents a molecule of hydrazine. Hydrazine is used in some types of rocket fuels.
Complete the statement.
Hydrazine is ##a compound##.
Look at the models of molecules below. Select the elementary substance.
cyclooctasulfur
acetaldehyde
fluoromethane
How many silicon atoms are there in 4 molecules SiH4?
3
4
2
