Chemistry: Negative Ions and Formulas

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Questions and Answers

Which of the following is the formula for the sulphate ion?

  • SO32-
  • S2O32-
  • SO2-
  • SO42- (correct)

The formula for the nitride ion is N2-

False (B)

What is the name of the ionic compound formed between sodium ions (Na+) and chloride ions (Cl-)?

Sodium chloride

The ______ ion has the formula CO32-

<p>carbonate</p> Signup and view all the answers

Match the following negative ions with their corresponding formulas:

<p>Oxide ion = O2- Sulphate ion = SO42- Sulphite ion = SO32- Sulphide ion = S2-</p> Signup and view all the answers

Flashcards

Oxide ion

A negatively charged ion composed of oxygen with a charge of -2 (O2-).

Sulfate ion

A negatively charged ion made of sulfur and four oxygen atoms with a charge of -2 (SO42-).

Carbonate ion

A negatively charged ion consisting of carbon and three oxygen atoms, with a charge of -2 (CO32-).

Phosphate ion

A negatively charged ion made of phosphorus and four oxygen atoms, with a charge of -3 (PO43-).

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Sodium chloride

An ionic compound formed from sodium ions (Na+) and chloride ions (Cl-) resulting in NaCl.

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Study Notes

Negative Ions and Formulas

  • Oxide ion: O2-
  • Sulphate ion: SO42-
  • Sulphite ion: SO32-
  • Sulphide ion: S2-
  • Carbonate ion: CO32-
  • Thiosulphate ion: S2O32-
  • Chromate (VI) ion: CrO42-
  • Dichromate (VI) ion: Cr2O72-
  • Phosphate ion: PO43-
  • Nitride ion: N3-

Ionic Compound Formulae

  • Sodium chloride: NaCl

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