EasyChemistryHigh School (9–10)GeneralAtoms and Molecules › Molecules, Ions and FormulaeConceptualBoard Exam

Each of these is a molecule. Say which are molecules of an element and which are molecules of a…

Try it on paper first. A hint, the key idea and the worked solution are here when you need them.

Each of these is a molecule. Say which are molecules of an element and which are molecules of a compound, and give the atomicity of each.

$\text{N}_2$
$\text{CO}$
$\text{P}_4$
$\text{H}_2\text{O}_2$
$\text{S}_8$
$\text{NO}_2$

Need a reminder? The key ideaShow

A molecule is a group of atoms joined together. Its atomicity is the number of atoms in it. A small number after a symbol counts atoms in one molecule; a number in front counts molecules; a number after a bracket multiplies everything inside.

The worked solution

Have you tried it?

Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.

← All Problems

← How many atoms of hydrogen, nitrogen and oxygen are there in 2 HNO₃ and 3 H₂O taken together?Write the ion formed in each case, and say whether it is a cation or an anion. →

More onAtoms and Molecules › Molecules, Ions and Formulae

Discussion (0)

Loading…

Each of these is a molecule. Say which are molecules of an element and which are molecules of a…

The worked solution

Discussion (0)

Want to go further in Atoms and Molecules › Molecules, Ions and Formulae?