General Chemistry Online: Companion Notes: Compounds: Polyatomic ions: Quiz

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Compounds

Polyatomic ions

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1. Sodium acetate is used in chemical handwarmers and heating pads because it gives up a large amount of heat when it changes from a liquid to a solid. The formula for this compound is:

Na₂C₂H₃O₂

NaC₂H₄O

NaAc₂

NaC₂H₃O₂

Na₂C₂O₄

2. Sodium bicarbonate is "baking soda", the active ingredient in many antacids. The formula of the bicarbonate ion is:

HCO₃^2-

(CO₃)₂^4-

HCO₃^-

CO₃^2-

H₂CO₃^-

3. Chlorine dioxide is used as an oxidizing agent in many industrial processes. Because it is explosive, it is never shipped, but prepared as needed by a reaction involving the more stable chlorate ion. The formula of the chlorate ion is:

ClO₃^2-

ClO₃^-

ClO₄^-2

ClO₂^-

ClO₄^-

4. Sodium sulfate occurs in nature as the minerals mirabilite and thenardite. The formula of the sulfate ion is:

SO₄^-

S₂O₃^-2

SO₃^2-

HSO₄^-

SO₄^2-

5. If the selenate ion has formula SeO₄^2-, the selenite ion might be:

SeO₅^2-

SeO₄^3-

SeO₄⁺²

SeO₄^-

SeO₃^2-

6. A sudden surge in the concentration of thiosulfate ions in geyser water may be a sign that a volcanic eruption is imminent. The thiosulfate ion is:

S₂O₃^2-

SO₄^2-

S₂O₄^2-

SO₃^2-

S₂O₄^-

7. Bromate ion was baked into bread until recently as a preservative; it has been found to cause cancer in laboratory animals. The formula of the bromate ion is

BrO₄^-

BrO₃^2-

BrO₃^-

BrO₄^-2

HBrO₃^-

8. Periodate ion is used in staining procedures that improve the quality of microscopic images. The formula of the periodate ion is:

IO₃^2-

IO₄^-2

IO₃^-

HIO₃^-

IO₄^-

9. Iodate ion is used as a disinfectant. The formula of the iodate ion is

IO₄^-2

IO₃^-

IO₄^-

HIO₃^-

IO₃^2-

10. Ammonium nitrate is used as a fertilizer by farmers and as an explosive by terrorists. The formula of ammonium nitrate is

NH₃NO₂

AmNO₂

(NH₄)₂NO₂

NH₃NO₃

NH₄NO₃

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