Names and Formulas for Ionic Compounds

What would be the proper chemical formula for combining Al³⁺ and l^- :

• Al l₃

• Al₃l

• Al l

• Al₃ l₃

Tags

NGSS.MS-PS1-1

What is the correct name for Ca(ClO)2?

• Calcium hypochlorite

• Calcium chloride

• Calcium perchlorate

• Calcium dichloride

Answer explanation

Ca(ClO)2 is named calcium hypochlorite because it contains calcium (Ca) and hypochlorite ions (ClO). The other options refer to different compounds, making calcium hypochlorite the correct name.

Write the chemical formula for each of the following binary ionic compounds: Aluminum chloride, Magnesium chloride, Potassium nitride, Lithium sulfide, Barium bromide.

Answer explanation

The chemical formulas for the compounds are: Aluminum chloride (AlCl3), Magnesium chloride (MgCl2), Potassium nitride (K3N), Lithium sulfide (Li2S), and Barium bromide (BaBr2). Each formula reflects the charges of the ions.

Which of the following compounds has a polyatomic ion?

• NaCl

• MgCO3

• KCl

• Li2O

Answer explanation

MgCO3 contains the polyatomic ion carbonate (CO3^2-), while NaCl, KCl, and Li2O consist of only monatomic ions. Therefore, MgCO3 is the correct choice.

Prefixes such as 'di-' and 'tri-' are used in naming ionic compounds.

Answer explanation

Prefixes like 'di-' and 'tri-' indicate the number of atoms in molecular compounds, not ionic compounds. Ionic compounds are named based on the charges of the ions involved, so the statement is incorrect.

What is the correct name of the compound CaCl₂?

• Calcium dichloride

• Calcium dichlorine

• Calcium chlorine

• Calcium chloride

When writing chemical formulas, the ______ is always written first.

• Nonmetal

• Least electronegative

• negative

• positive

What is the correct name for Al₂S₃?

• Aluminium sulphite

• Aluminium sulphide

• Aluminium trisulphide

CaI₂

• calcium diodide

• calcium iodide

• calcium iodate

• calcium iodine

Tags

NGSS.MS-PS1-1

What's the formula for chlorine dioxide

• ClO₂

• CLO

• ClO₃

• HClO₂

Tags

NGSS.MS-PS1-1