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Checking Why a Melt and a Solution Conduct 4 questions
Checking Why a Melt and a Solution Conduct
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A particle exhibit compares two dry solids. It can model each pure substance as a solid or as a melt. It also mixes each substance with water and compares the resulting solution with a water-only control.
| Sample | Dry solid conducts | Pure melt conducts | Water mixture conducts |
|---|---|---|---|
| P | No | Yes | Yes |
| Q | No | No | Yes |
| Water only | — | — | No |
Question 1
Which comparison shows that the water-mixture result cannot by itself distinguish P from Q?
- Both water mixtures conduct.
- Neither dry solid conducts.
- Only the melt of P conducts.
- The water-only control does not conduct.
A second display shows P as a solid array of positive and negative ions. Q consists of neutral molecules as a pure substance. Some Q molecules react with water and make positive and negative ions.
Question 2
Use the particle models to explain why the melt of P conducts and the melt of Q does not.
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Question 3
A student says Q must be an ionic solid because its water mixture conducts. Evaluate the claim with the second display.
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Question 4
Suppose Q is mixed with a model liquid that dissolves its molecules without reacting and does not conduct by itself. Predict whether that mixture conducts in the stated model.
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