Question

chemical substances were originally named based on their properties, discoverers, or origins. this led to a chaotic assortment of names, which meant a lot of memorization! in 1919 the international union of pure and applied chemistry (iupac) proposed a common system for naming compounds based on the composition of each substance.
the common name and iupac names for three ionic compounds are given below.
common name iupac name uses
celestite strontium sulfate permanent magnets and glass for computers and tvs
arcanite potassium sulfate potassium and sulfur supplement in soil
gypsum calcium sulfate building materials such as plaster and drywall
label each image with the chemical formula for the substance indicated below.
click each dot on the image to select an answer.
celestite arcanite gypsum
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Explanation:

For strontium sulfate, strontium has a +2 charge ($Sr^{2 +}$) and sulfate is $SO_{4}^{2-}$, so the formula is $SrSO_{4}$. Potassium has a +1 charge ($K^{+}$) and sulfate is $SO_{4}^{2-}$, so potassium sulfate's formula is $K_{2}SO_{4}$. Calcium has a +2 charge ($Ca^{2+}$) and sulfate is $SO_{4}^{2-}$, so calcium sulfate's formula is $CaSO_{4}$.

Answer:

Celestite (strontium sulfate): $SrSO_{4}$
Arcanite (potassium sulfate): $K_{2}SO_{4}$
Gypsum (calcium sulfate): $CaSO_{4}$