Writing Chemical Formulas for Ionic Compounds

This video tutorial explains how to write chemical formulas for ionic compounds. It covers the charges of ions from different groups in the periodic table, including alkali metals, alkaline earth metals, and halogens. The tutorial demonstrates writing formulas for compounds with equal and different charge magnitudes, using examples like sodium bromide and aluminum chloride. It also addresses polyatomic ions and transition metals, providing techniques like the crisscross method to balance charges and write correct formulas.

Which group in the periodic table contains elements that typically form ions with a +1 charge?

• Group 1

• Group 2

• Group 4

• Group 3

What charge do elements in Group 2 of the periodic table typically form?

• +1

• -2

• +2

• -1

What is the chemical formula for sodium bromide?

• NaBr

• Na2Br2

• Na2Br

• NaBr2

How do you write the chemical formula for calcium sulfide?

• CaS

• Ca2S2

• Ca2S

• CaS2

What is the chemical formula for aluminum phosphide?

• AlP3

• Al3P

• AlP

• Al3P3

How do you determine the chemical formula for aluminum chloride?

• AlCl

• AlCl2

• AlCl3

• Al2Cl3

What is the chemical formula for sodium oxide?

• NaO2

• NaO

• Na2O

• Na2O2

When writing the chemical formula for barium phosphate, why do you need to use parentheses?

• To simplify the formula

• To indicate multiple polyatomic ions

• To show the charge of the ion

• To balance the equation

What is the chemical formula for barium phosphate?

• Ba3(PO4)2

• Ba2(PO4)3

• Ba(PO4)2

• BaPO4

What does the Roman numeral in iron (III) sulfate indicate?

• The number of iron atoms

• The charge on the iron ion

• The number of sulfate ions

• The total charge of the compound