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Following an Empty Site in a Model Crystal 4 questions
Following an Empty Site in a Model Crystal
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A display models four positions in one row of a crystal. Negative ions stay fixed around the row. A positive ion can move one position right if the adjacent position is empty. During the two moves shown, the solid keeps its overall structure. The model compares a full row with a row that starts with an empty position.
| State | Position 1 | Position 2 | Position 3 | Position 4 |
|---|---|---|---|---|
| Full row | Positive ion | Positive ion | Positive ion | Positive ion |
| Other row at start | Positive ion | Positive ion | Positive ion | Empty |
| Other row after one move | Positive ion | Positive ion | Empty | Positive ion |
Question 1
Which change accounts for the state after one move?
- An ion moves from position 3 to position 4.
- An ion moves from position 4 to position 3.
- An ion moves from position 1 to position 2.
- A negative ion moves from position 3 to position 4.
Question 2
After one more allowed move in the same row, state where the empty position will be and which ion moves.
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Question 3
Compare the direction in which the empty position appears to move with the direction of the positive ions.
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Question 4
A student says positive charge cannot move through either model row because the crystal stays solid. Use the two starting arrangements to evaluate the claim.
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