An electrolyte is a substance that when dissolved in water, the solution will conduct electricity. A solution that conducts electricity well is said to contain a strong electrolyte. A solution that conducts electricity poorly even when a significant quantity of the solute is present contains a weak electrolyte. In contrast, a substance that does not conduct electricity when dissolved in water is a nonelectrolyte. Watch the video about the electrolytic properties of sodium chloride, NaClNaCl, and sugar.
Part A
Watch the animation, then check off the samples that will conduct electricity.
Solid sugar
Solid NaCl
NaCl solution
Sugar solution
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Part B
A student tests four solids for their ability to complete an electrical circuit when dissolved in water by observing their ability to close a circuit containing a light bulb and obtains the following results:
Solid Concentration (M) Strength of light emitted
A 0.20 Bright
B 0.20 Dim
C 0.20 None
D 0.20 Bright
Which of the solids is a weak electrolyte when dissolved in water?
A
B
C
D
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Part C
Look again at the table in Part B, repeated below.
Solid Concentration (M) Strength of light emitted
A 0.20 Bright
B 0.20 Dim
C 0.20 None
D 0.20 Bright
The student is told that one of the four solids tested is actually calcium bromide ,CaBr2. Which of the solids could be CaBr2?
A
B
C
D
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Part D
This question will be shown after you complete previous question(s).

A strong electrolyte will dissociate completely in solution and lead to a bright light. A nonelectrolyte will not light the bulb at all. A weak electrolyte or a substance that is not too soluble in water will produce a dim light.

Since CaBr2 is not as soluble in water as NaCl, it does not produce bright light as NaCl does hence 0.20 M solution of the solution will lead to a dim light.