Afterwards the melting point of the substances were

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low conductivity.
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Afterwards, the melting point of the substances were tested. The melting point was tested by placing a sheet of aluminum foil over a ring stand. Next, a lit candle was placed under the aluminum foil in the center so that the wick of the candle touched the underside of the aluminum foil pan. Then with a wood splint, a few crystals of each substance were placed onto the aluminum foil not touching each other. Then the candle was lit and the time taken for a substance to melt was observed. If a substance melted quickly, then it had a low melting point, but if it took a lot of time to melt, then it had a high melting point. The reason why aluminum foil was used for this test is because it evenly heats all over its surface allowing the results to be accurate. Results Table 1. Initial appearance Substance Sucrose Sodium Chloride A B C D Appearance White, small, hard texture White, small, hard texture White, small White, small, no chunks, soft, very fine White, powdery, soft, large crystals White, small, clumpy, grainy Table 2. Observations from tests of physical properties Substance Sucrose Sodium Chloride A B C D Solubility in water (soluble or insoluble) Soluble Soluble Soluble Soluble Insoluble Soluble Conductivity of substance in Low High Low High High High
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solution (high or low) Melting point (high or low) Low Not melted Low Not melted Not melted Not melted Classification (Ionic or molecular) Molecular Ionic Molecular Ionic Molecular Ionic Discussion 1. A student used only solubility to classify substances as either molecular or ionic. This could lead to inaccurate results because both molecular and ionic substances can be both soluble and insoluble.
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