Write the chemical names of the following compounds:
$(a)$ $K_{2}SO_{4}$
$(b)$ $Mg_{3}(PO_{4})_{2}$
$(c)$ $NH_{4}Cl$
$(d)$ $ZnS$
$(e)$ $Na_{3}N$
$(f)$ $AgBr$

What is the $SI$ prefix for each of the following multiples and submultiples of a unit?
$(a)$ $10^{3}$
$(b)$ $10^{-1}$
$(c)$ $10^{-2}$
$(d)$ $10^{-6}$
$(e)$ $10^{-9}$
$(f)$ $10^{-12}$

$(a)$ State the law of conservation of mass.
$(b)$ What mass of silver nitrate will react with $5.85 \, g$ of sodium chloride to produce $14.35 \, g$ of silver chloride and $8.5 \, g$ of sodium nitrate,if the law of conservation of mass is true?

Express each of the following in kilograms:
$(a)$ $5.84 \times 10^{-3} \,mg$
$(b)$ $58.34 \,g$
$(c)$ $0.584 \,g$
$(d)$ $5.873 \times 10^{-21} \,g$

In a compound such as water,the ratio of the mass of hydrogen to the mass of oxygen is always

What weight of sodium contains the same number of atoms as are present in $16\, g$ of sulphur (in $, g$)?