questions about solutions, solids, and liquids?

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A slightly polar substance is found to melt at -12 (negative 12) degrees Celsius, and vaporize at 25 degrees Celsius.

1. Sketch a heating curve, include labels

2. Compared to water, with a boiling point of 100, would this substance contain stronger, or weaker intermolecular forces? Are these forces likely to be hydrogen bonding? Explain

3. Would this substance be a good solvent for paper chromatography at room temperature (approximately 293 K)? Explain.

4. At 10 degrees Celsius, what could be done to increase the solubility of a chunk of calcium carbonate in the substance? Give TWO ideas.

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  • 1 month ago
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    1. The image below is the heating curve for water. Just alter the temperature axis and you can produce your own heating curve for this substance.

    2. Weaker intermolecular forces than water. It is impossible to know whether the forces are H-bonds are not. Having H-bonds does not guarantee high melting and boiling points, but that these temperatures are relatively higher than a substance without H-bonding.

    3. No, because 293K is very close to the substances boiling point (298 K)

    4. (assuming you cannot increase the temperature) Break it up into smaller pieces, stir a lot. This won't increase the actual solubility of the solid, but it will help it dissolve faster. 

    Attachment image
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