Question

question 8
6 pts
what is the formula of magnesium sulfate?
mgs
mgso3
mgso4
mgso
question 9
6 pts
what is the formula of calcium nitrate?
ca3n2
ca(no2)3
ca(no3)2
ca(no2)2

Explanation:

Magnesium has a +2 charge ($Mg^{2+}$) and sulfate is the poly - atomic ion $SO_{4}^{2 - }$. They combine in a 1:1 ratio to form magnesium sulfate with the formula $MgSO_{4}$. Calcium has a +2 charge ($Ca^{2+}$) and nitrate is the poly - atomic ion $NO_{3}^{-}$. To balance the charges, two nitrate ions are needed for one calcium ion, giving the formula $Ca(NO_{3})_{2}$.

Answer:

Question 8: C. $MgSO_{4}$
Question 9: C. $Ca(NO_{3})_{2}$