Deduce the chemical formulas of the compounds below with reference to Tables 4.4 and 4.6:

Here are the chemical formulas for the given compounds:

a) calcium sulfate
Calcium is $\text{Ca}^{2+}$ and sulfate is $\text{SO}_4^{2-}$. The charges balance.

$$\boxed{\text{CaSO}_4}$$

b) sodium carbonate
Sodium is $\text{Na}^{+}$ and carbonate is $\text{CO}_3^{2-}$. Two sodium ions are needed to balance one carbonate ion.

$$\boxed{\text{Na}_2\text{CO}_3}$$

c) potassium hydroxide
Potassium is $\text{K}^{+}$ and hydroxide is $\text{OH}^{-}$. The charges balance.

$$\boxed{\text{KOH}}$$

d) ammonium chloride
Ammonium is $\text{NH}_4^{+}$ and chloride is $\text{Cl}^{-}$. The charges balance.

$$\boxed{\text{NH}_4\text{Cl}}$$

e) copper(II) sulfite
Copper(II) is $\text{Cu}^{2+}$ and sulfite is $\text{SO}_3^{2-}$. The charges balance.

$$\boxed{\text{CuSO}_3}$$

f) lithium hydrogencarbonate
Lithium is $\text{Li}^{+}$ and hydrogencarbonate (bicarbonate) is $\text{HCO}_3^{-}$. The charges balance.

$$\boxed{\text{LiHCO}_3}$$

g) silver(I) nitrate
Silver(I) is $\text{Ag}^{+}$ and nitrate is $\text{NO}_3^{-}$. The charges balance.

$$\boxed{\text{AgNO}_3}$$

h) barium sulfate
Barium is $\text{Ba}^{2+}$ and sulfate is $\text{SO}_4^{2-}$. The charges balance.

$$\boxed{\text{BaSO}_4}$$