Polyatomic Ions

What is the definition of a polyatomic ion?

• An ion made of a single atom with a charge

• An ion made of multiple atoms with an overall charge

• An ion that only bonds with oxygen

• An ion whose name always ends in '-ide'

Which polyatomic ion is an exception to the naming rule where oxygen-containing ions typically end in '-ate' or '-ite'?

• Nitrate

• Carbonate

• Hydroxide

• Sulphate

When comparing two related polyatomic ions, one ending in '-ate' and the other in '-ite', which statement is true regarding their oxygen content?

• The '-ate' ion has fewer oxygen atoms than the '-ite' ion

• The '-ate' ion has more oxygen atoms than the '-ite' ion

• The '-ate' ion always has a positive charge

• The '-ite' ion always has a negative charge

How is the valency of a single atom typically determined compared to that of a polyatomic ion?

• Both are determined by memorization.

• Both are found on the periodic table.

• Single atoms are found on the periodic table, while polyatomic ions require memorization.

• Single atoms require memorization, while polyatomic ions are found on the periodic table.

When writing the chemical formula for a compound containing a polyatomic ion, when is it necessary to enclose the polyatomic ion in brackets?

• Only when the polyatomic ion is the first part of the formula.

• When the subscript for the polyatomic ion is greater than one.

• When the subscript for the metal atom is greater than one.

• Never, brackets are not used in chemical formulas.

What is the correct chemical formula for Magnesium Hydrogen Carbonate?

• MgHCO3

• Mg(HCO3)2

• Mg2HCO3

• Mg(HCO3)

What is the correct chemical formula for Ammonium Sulphate?

• NH4SO4

• (NH4)2SO4

• NH4(SO4)2

• (NH4)2(SO4)2