Crossover Method for Writing Chemical Formulas

What is the crossover method used for?

• Determining molecular shapes

• Writing formulas for ionic compounds

• Calculating molar masses

• Balancing chemical equations

What is the charge on a magnesium ion?

• 2-

• 1+

• 2+

• 1-

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the correct formula for magnesium chloride?

• Mg2Cl3

• Mg2Cl

• MgCl2

• MgCl

Tags

NGSS.MS-PS1-1

What is the charge on a calcium ion?

• 2-

• 1-

• 2+

• 1+

What is the simplified formula for calcium oxide?

• Ca2O2

• Ca2O

• CaO2

• CaO

What is the charge on a chromium(III) ion?

• 2+

• 1+

• 3+

• 3-

What is the correct formula for chromium(III) sulfide?

• CrS2

• Cr3S2

• CrS

• Cr2S3

What is the charge on a palladium(IV) ion?

• 3+

• 4-

• 4+

• 2+

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the simplified formula for palladium(IV) oxide?

• PdO

• PdO2

• Pd2O4

• Pd2O

Which of the following formulas is correct for an ionic compound with a 2+ cation and a 1- anion?

• AB2

• A2B

• A2B3

• AB