Ionic Compounds and Ions Quiz

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What defines a cation in ionic compounds?

An ion that has gained electrons.

An ion with a positive charge. (correct)

An atom with no charge.

A negatively charged ion.

What is the likely reason for difficulty in identifying ions in complex mixtures?

One species may interfere with the analytical test for another. (correct)

The presence of anions complicates the tests significantly.

Ions may not react with any reagents.

All ions behave identically in reactions.

In identifying ions, what does the presence of a precipitate indicate?

The ions are soluble in the tested solution.

A chemical reaction has occurred resulting in an insoluble product. (correct)

There are no ions present in the solution.

The ions both dissolve completely in the solvent.

Which of the following ions form as a result of electron removal from an atom?

Cations only. Signup and view all the answers

When referring to elements that typically form ionic compounds, which statement is true?

They are typically a mix of metals and nonmetals. Signup and view all the answers

What does the superscript on an ion indicate?

The net charge on the ion. Signup and view all the answers

Which of the following statements is true regarding soluble and insoluble compounds?

Insoluble compounds do not dissociate in water. Signup and view all the answers

What is an anion?

An ion formed by gaining electrons. Signup and view all the answers

What is formed when silver thiosulfate is heated?

Silver sulfide Signup and view all the answers

What is the result of adding urea to a sample containing nitrite ions after acidification?

Formation of carbon dioxide and nitrogen gas Signup and view all the answers

What type of precipitate is formed when chloride ions react with silver nitrate?

White curdy precipitate Signup and view all the answers

Which compound is insoluble in strong acids and bases?

Silver chloride Signup and view all the answers

Which ion is reduced to nitrogen gas when reacting with urea and nitric acid?

Nitrite ion Signup and view all the answers

What is the color of the precipitate formed when bromide ions react with silver nitrate?

Yellow Signup and view all the answers

What happens to silver bromide precipitate in concentrated ammonia solution?

It dissolves Signup and view all the answers

What type of ions are involved in the formation of silver thiosulfate complexes?

Thiosulfate ions Signup and view all the answers

What is the characteristic reaction product formed when phosphate ions react with ammonium molybdate?

Ammonium phosphomolybdate Signup and view all the answers

Which ion is confirmed by the formation of a white precipitate when barium chloride is added?

Sulfate ion Signup and view all the answers

What role does heating serve in the procedure for testing phosphate ions?

Facilitates the formation of a precipitate Signup and view all the answers

What happens when excess thiosulfate is added to the white silver thiosulfate precipitate?

The precipitate dissolves to form a thiosulfate complex ion Signup and view all the answers

Which of the following reagents is added to test for sulfate ions?

Barium chloride (BaCl2) Signup and view all the answers

In which part of the procedure is nitric acid used?

To acidify ammonium molybdate Signup and view all the answers

How is thiosulfate ion (S2O32–) primarily identified in the laboratory procedure?

By its reaction with silver nitrate Signup and view all the answers

What is the significance of the test tube being clean and dry before adding the solutions?

It prevents contamination Signup and view all the answers

What is the product formed when iron(III) ions react with hydrogen phosphate?

Iron(III) phosphate Signup and view all the answers

Which compound is added to prevent the release of hydrogen ions during iron(III) phosphate precipitation?

Sodium acetate Signup and view all the answers

What type of precipitate is formed when aluminum ions react with sodium hydroxide?

White, gelatinous precipitate of aluminum hydroxide Signup and view all the answers

What is the amphoteric behavior of aluminum hydroxide?

It dissolves in both acids and bases Signup and view all the answers

What is observed when excess ammonia is added to a chromium(III) hydroxide precipitate?

A pink or violet complex ion is formed Signup and view all the answers

What is the appearance of chromium(III) hydroxide precipitate?

Gelatinous gray-green or gray-blue Signup and view all the answers

What happens when chromium(III) hydroxide is boiled in the presence of complexing agents?

Chromium(III) hydroxide reprecipitates Signup and view all the answers

What species is produced from the reaction of aluminum hydroxide with excess hydroxide ions?

Aluminum hydroxide complex anion Signup and view all the answers

What is the product formed when the sulfate ion reacts with barium chloride?

BaSO4 Signup and view all the answers

Which ion reacts with silver nitrate to produce a precipitate of silver chloride?

Chloride ion (Cl¯) Signup and view all the answers

What is the significance of the ammonium phosphomolybdate complex formed in the reaction involving the phosphate ion?

It indicates the presence of phosphates. Signup and view all the answers

In the reaction involving the thiosulfate ion and silver nitrate, what is the main product formed?