Question

determine the formula for each compound from its name. calcium sulfate: chromium(iii) fluoride: tetraphosphorus decoxide:

Explanation:

Step1: Identify ions for calcium sulfate

Calcium has a +2 charge ($Ca^{2 +}$) and sulfate ($SO_{4}^{2 -}$) has a - 2 charge. To balance the charges, the ratio is 1:1.

Step2: Identify ions for chromium(III) fluoride

Chromium(III) has a +3 charge ($Cr^{3+}$) and fluoride ($F^{-}$) has a - 1 charge. To balance the charges, we need 3 fluoride ions for 1 chromium(III) ion.

Step3: Interpret prefixes for tetraphosphorus decoxide

The prefix "tetra -" means 4 for phosphorus and "deca -" means 10 for oxygen.

Answer:

calcium sulfate: $CaSO_{4}$
chromium(III) fluoride: $CrF_{3}$
tetraphosphorus decoxide: $P_{4}O_{10}$