Question

move the cards to match the name with the correct chemical formula.
chemical formula|name
sts|strontium sulfate
na₂so₄|sodium sulfide
na₂s|sodium sulfate
srso₄|strontium sulfide
srse|strontium selenide
na₂se|sodium selenide
show periodic table

Explanation:

Step1: Identify strontium compounds

Strontium is Sr. Sulfate is $SO_4^{2 - }$, sulfide is $S^{2 - }$, selenide is $Se^{2 - }$. So strontium sulfate is $SrSO_4$, strontium sulfide is $SrS$, strontium selenide is $SrSe$.

Step2: Identify sodium compounds

Sodium is Na. Sodium sulfide has two sodium ions to balance the - 2 charge of sulfide ion, so it is $Na_2S$. Sodium sulfate has two sodium ions to balance the - 2 charge of sulfate ion, so it is $Na_2SO_4$. Sodium selenide has two sodium ions to balance the - 2 charge of selenide ion, so it is $Na_2Se$.

Answer:

SrS - strontium sulfide
$Na_2SO_4$ - sodium sulfate
$Na_2S$ - sodium sulfide
$SrSO_4$ - strontium sulfate
$SrSe$ - strontium selenide
$Na_2Se$ - sodium selenide