Ionic Compounds and Ions Quiz
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Questions and Answers

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?

    <p>Cations only. (D)</p> Signup and view all the answers

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

    <p>They are typically a mix of metals and nonmetals. (D)</p> Signup and view all the answers

    What does the superscript on an ion indicate?

    <p>The net charge on the ion. (D)</p> Signup and view all the answers

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

    <p>Insoluble compounds do not dissociate in water. (D)</p> Signup and view all the answers

    What is an anion?

    <p>An ion formed by gaining electrons. (D)</p> Signup and view all the answers

    What is formed when silver thiosulfate is heated?

    <p>Silver sulfide (D)</p> Signup and view all the answers

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

    <p>Formation of carbon dioxide and nitrogen gas (C)</p> Signup and view all the answers

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

    <p>White curdy precipitate (B)</p> Signup and view all the answers

    Which compound is insoluble in strong acids and bases?

    <p>Silver chloride (A)</p> Signup and view all the answers

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

    <p>Nitrite ion (C)</p> Signup and view all the answers

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

    <p>Yellow (A)</p> Signup and view all the answers

    What happens to silver bromide precipitate in concentrated ammonia solution?

    <p>It dissolves (A)</p> Signup and view all the answers

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

    <p>Thiosulfate ions (D)</p> Signup and view all the answers

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

    <p>Ammonium phosphomolybdate (B)</p> Signup and view all the answers

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

    <p>Sulfate ion (D)</p> Signup and view all the answers

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

    <p>Facilitates the formation of a precipitate (C)</p> Signup and view all the answers

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

    <p>The precipitate dissolves to form a thiosulfate complex ion (C)</p> Signup and view all the answers

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

    <p>Barium chloride (BaCl2) (D)</p> Signup and view all the answers

    In which part of the procedure is nitric acid used?

    <p>To acidify ammonium molybdate (A)</p> Signup and view all the answers

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

    <p>By its reaction with silver nitrate (C)</p> Signup and view all the answers

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

    <p>It prevents contamination (A)</p> Signup and view all the answers

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

    <p>Iron(III) phosphate (C)</p> Signup and view all the answers

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

    <p>Sodium acetate (C)</p> Signup and view all the answers

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

    <p>White, gelatinous precipitate of aluminum hydroxide (B)</p> Signup and view all the answers

    What is the amphoteric behavior of aluminum hydroxide?

    <p>It dissolves in both acids and bases (C)</p> Signup and view all the answers

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

    <p>A pink or violet complex ion is formed (B)</p> Signup and view all the answers

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

    <p>Gelatinous gray-green or gray-blue (A)</p> Signup and view all the answers

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

    <p>Chromium(III) hydroxide reprecipitates (D)</p> Signup and view all the answers

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

    <p>Aluminum hydroxide complex anion (C)</p> Signup and view all the answers

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

    <p>BaSO4 (C)</p> Signup and view all the answers

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

    <p>Chloride ion (Cl¯) (D)</p> Signup and view all the answers

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

    <p>It indicates the presence of phosphates. (B)</p> Signup and view all the answers

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

    <p>Silver sulfide (D)</p> Signup and view all the answers

    What role does the iron(III) ion play in the reactions involving phosphate ions?

    <p>It forms a precipitate of iron phosphate. (B)</p> Signup and view all the answers

    What is the final outcome of the reaction between the nitrite ion and urea?

    <p>Generation of nitrogen gas and carbon dioxide. (C)</p> Signup and view all the answers

    Which of the following is not a results of the reaction between the aluminum ion and hydroxide ion?

    <p>Production of hydroxyl ions. (C)</p> Signup and view all the answers

    What is a characteristic product of the bromide ion when reacted with silver nitrate?

    <p>AgBr(s) (A)</p> Signup and view all the answers

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