CHEMISTRY WORKSHEET (CLASS-IX)
LESSON- ATOMS AND MOLECULES

1.Calculate the molecular masses of
a.Ammonia
b. Quick lime
c.Baking soda
d.Chlorine gas
e.Methane

2.what is the mass of 0.2 mole of oxygen atoms?

3.calculate the mass percentage of each element of sodium chloride in one mole of it.

4.work out he formulae of the following compounds.also name the ions present in each of them.
a.Magnesium chloride
b.iron sulphide
c.Aluminium sulphate

5 write the formula of the compounds formed by the following ions
a. Ca2+ , CO2_
b. Mg2+, Cl_