Multiple Choice
Which observation using a conductivity apparatus indicates that a solution contains ionic substances rather than covalent substances?
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6. Chemical Quantities & Aqueous Reactions
Electrolytes
Multiple Choice
Which one of the following substances can be classified as a nonelectrolyte?
A
KNO3 (potassium nitrate)
B
HCl (hydrochloric acid)
C
C6H12O6 (glucose)
D
NaCl (sodium chloride)
Verified step by step guidance1
Understand the definition of an electrolyte: an electrolyte is a substance that dissociates into ions when dissolved in water, allowing the solution to conduct electricity.
Identify the nature of each substance: KNO3, HCl, and NaCl are ionic compounds or strong acids that dissociate completely into ions in aqueous solution, making them strong electrolytes.
Recognize that C6H12O6 (glucose) is a molecular compound that dissolves in water but does not dissociate into ions; it remains as intact molecules.
Conclude that since glucose does not produce ions in solution, it cannot conduct electricity and is therefore classified as a nonelectrolyte.
Summarize that nonelectrolytes are typically covalent compounds like sugars, alcohols, and other molecular substances that dissolve without ionizing.
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