Ionic Compound Formulas

What is the formula for the compound formed between the calcium (#20) ion and the fluoride (#9) ion?

• CaF

• CaF₂

• Ca₂F

• Ca₂F₂

What is the name of this ionic compound?

• Aluminum oxide

• Dialuminum trioxide

• Aluminate

• Aluminum(III) oxide

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Which of the following is a common ionic compound?

• NaCl

Identify the correct formula for barium sulfate.

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DOK Level 2: Skill/Concept

Which of the following is the correct formula for these two ions: Al⁺³ & S^-2

• AlS₃

• Al₂S₃

• Al₃S₂

• Al₃S

Tags

NGSS.MS-PS1-1

Identify the correct formula for ammonium sulfate.

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DOK Level 2: Skill/Concept

Which of the following is the correct formula for potassium permanganate?

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DOK Level 2: Skill/Concept

Which of the following is the correct formula for calcium nitrate?

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DOK Level 2: Skill/Concept

The ions Ca²⁺ and PO₄ ^3- form a salt with the formula __________.

• CaPO₄

• Ca₂(PO₄)₃

• Ca₂PO₄

• Ca₃(PO₄)₂

Answer explanation

The crossover method where Ca2+ and PO4 3- --> Ca3(PO4)2 where the charges become the subscripts. This reveals the correct formula. Simplify, when possible.

The correct formula for the salt formed by Ca^2+ and PO4^3- ions is Ca3(PO4)2. This is named Calcium Phosphate.

Tags

NGSS.MS-PS1-1

Which of the following is the correct formula for iron(III) phosphate?

Tags

DOK Level 2: Skill/Concept