Name Period

Formulas of Compounds Polyatomics How many of each element are present in the following compounds and what is the molar mass of each compound? Molar Mass KOH K = 1 O = 1 H = 1 56.11 g Ca(OH)2 Ca = 1 O = 2 H = 2 74.10 g Be(ClO4)2 MgSO4 H3PO4 (NH4)3P Sr(CN)2 FeCO3 RbMnO4 Fe2(CO4)3

The positive ion is on the left and the negative ion on the right. Use subscripts to make the compound neutral. Name the compound.

Positive Ion (Cation) Formula Name Negative Ion (Anion) + 3- Potassium K K3PO4 Potassium phosphate PO4 phosphate + - Lithium Li NO2 nitrite 2+ 2- Magnesium Mg SO4 sulfate Hydrogen H+ CN- cyanide + - Silver Ag HCO3 bicarbonate Calcium Ca2+ O2- oxide Strontium Sr2+ OH- hydroxide 2+ 2- Beryllium Be CO3 carbonate + 2- Sodium Na SO3 sulfite Gallium Ga3+ ClO- hypochlorite + - Potassium K MnO4 permanganate 3+ - Indium In NO3 nitrate 2+ - Barium Ba ClO3 chlorate Aluminum Al3+ N3- nitride Zinc Zn2+ Br- bromide + - Ammonium NH4 Cl chloride

Write the formula for the following compounds. This set has only binary compounds.

Name Cation Anion Formula Molar Mass Potassium chloride K+ Cl- KCl 74.55 g Calcium sulfide Aluminum bromide Lithium sulfide Barium iodide Gallium selenide Name Period

Write the formula for the following compounds.

Name Cation Anion Formula Molar Mass + 3- Potassium phosphate K PO4 K3PO4 212.27 g Ammonium chloride Strontium nitrate Gallium sulfite Sodium cyanide Beryllium chlorate Lithium carbonate

Fill in the following formulas.

Hydroxide Phosphate Carbonate Sulfate Nitrite Sulfite

Ammonium NH4OH (NH4)3PO4

Aluminum Al(OH)3 Strontium Gallium Calcium Hydrogen Vanadium(III) Magnesium

Fill in the following formulas. Place an X where no formula is possible. (Positive ion combined with a positive or a negative ion combined with a negative ion)

Hydroxide Gallium Ammonium Phosphate Magnesium Nitrite Hydrogen Nitrate Oxide Lithium Cyanide Barium Bicarbonate Sulfate Aluminum Beryllium