Question

move the cards to match the name with the correct chemical formula.
chemical formula name
caco₃ potassium chromate
k₂cro₄ calcium chromate
cacl₂ potassium chloride
k₂co₃ calcium chloride
kcl calcium carbonate
cacro₄ potassium carbonate

Explanation:

• For potassium chromate: Potassium ($K$) has a +1 charge, chromate ($CrO_4^{2 - }$) has a -2 charge. Using the criss - cross method (charge of one ion becomes subscript of the other), the formula is $K_2CrO_4$.
• For calcium chromate: Calcium ($Ca$) has a +2 charge, chromate ($CrO_4^{2 - }$) has a -2 charge. So the formula is $CaCrO_4$ (subscripts of 1 are omitted).
• For potassium chloride: Potassium ($K$) has a +1 charge, chloride ($Cl^-$) has a -1 charge. The formula is $KCl$.
• For calcium chloride: Calcium ($Ca$) has a +2 charge, chloride ($Cl^-$) has a -1 charge. Using the criss - cross method, the formula is $CaCl_2$.
• For calcium carbonate: Calcium ($Ca$) has a +2 charge, carbonate ($CO_3^{2 - }$) has a -2 charge. The formula is $CaCO_3$.
• For potassium carbonate: Potassium ($K$) has a +1 charge, carbonate ($CO_3^{2 - }$) has a -2 charge. Using the criss - cross method, the formula is $K_2CO_3$.

Answer:

• $CaCO_3$: calcium carbonate
• $K_2CrO_4$: potassium chromate
• $CaCl_2$: calcium chloride
• $K_2CO_3$: potassium carbonate
• $KCl$: potassium chloride
• $CaCrO_4$: calcium chromate