What is meant by the term chemical formula ?

If one mole of carbon atoms weighs $12$ $g$, what is the mass (in grams) of $1$ atom of carbon ?

Give the names of the elements present in the following compounds.

$(a)$ Quick lime

$(b)$ Hydrogen bromide

$(c)$ Baking powder

$(d)$ Potassium sulphate.

Which postulate of Dalton’s atomic theory can explain the law of definite proportions ?

Write down the formulae of

$(i)$ sodium oxide

$(ii)$ aluminium chloride

$(iii)$ sodium suphide

$(iv)$ magnesium hydroxide