water- plastic or water-glass Referring to Part C in the experiment, what effect

Question

water- plastic or water-glass Referring to Part C in the experiment, what effect does soap have on the surface tension of water? 4. Referring to Part D in the experiment, the same intermolecular force (the dispersion force) is responsible for the attraction between hexane molecyles and oil molecules. Compare the size of hexane molecules and oil molecules 5. Hexane is a much larger molecule than water. Referring to Part E of the experiment, explain why water has a higher boiling point than hexane. 199

Explanation / Answer

1. After adding soap in water, it reduces the surface tension by reducing hydrogen bonding and departing the water molecules from each other. Thus water droplets get weaker and clean dirt easily from clothes and dishes.

2. Hexane is non-polar molecule and oil is also a polar molecule, that's why they attract each other and as we know like dissolves like, they are soluble. The sizes of both the ions remain same.

3. Hexane is a larger molecule than water, but it is non-polar and intermolecular force of attraction is less than any other polar molecules like water. The water molecule contains hydrogen bond and binds the molecules closure and hence increases the boiling point, However hexane molecule being nonpolar, is absent of strong attracting bonding force except dispersion force.

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