A student investigates four solids, A, B, C and D.
For each solid the student finds out whether it melts when heated in a Bunsen flame, whether the solid conducts electricity, whether it dissolves in water, and whether the solution formed conducts electricity.
The results are shown in Table 1.1.
Table 1.1
solid | melts in a Bunsen flame | solid conducts electricity | dissolves in water | solution conducts electricity |
|---|---|---|---|---|
A | no | no | yes | yes |
B | yes | no | yes | no |
C | no | yes | no | not tested |
D | no | no | no | not tested |
Identify which solid is an ionic compound.
Give two results from Table 1.1 that support your answer.
The student concludes that solid C is a metal.
State the result in Table 1.1 that supports this conclusion.
The student tests the solutions using the same pair of electrodes each time, without washing them between tests.
Explain why this could affect the results.
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