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3 years ago

If a solution were to change its composition during freezing, how do you think this would change the cooling curve?

Chemistry

1 answer:

andrew11 [14]3 years ago

3 0

Answer: freezing point increases.

Explanation:

NB:kindly check attached file/picture for the diagram showing COOLING CURVE.

A cooling curve is a plot of temperature against time. It represents the change of phase of matter either from a gas to a solid or a liquid to a solid. The "cooling rate" is the slope of the cooling curve at any point.

The starting temperature, labelled A from the diagram is the POURING TEMPERATURE, the labelled B is the EQUILIBRIUM TEMPERATURE.

IF A SOLUTION were to CHANGE its composition during freezing, the Freezing Point will increase because as the solution gets more colder, some solute would drop out of solution. As solute drop out of the solution it will cause an increament in the freezing point.

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3 years ago

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3 years ago

Based on your knowledge of intermolecular forces, which of the following would you expect to have the highest boiling point? hex

12345 [234]

Answer:
Hexanol has the highest boiling point.

Explanation:
Boiling points of all give compounds are as follow,

Hexanol   = 157 °C

Hexanal = 129 °C

Hexanone = 128 °C

Hexane =   68 °C

Types of Interactions found in these compounds are,

Hexanol   = Hydrogen Bonding & London Dispersion Forces

Hexanal   = Dipole-Dipole Interactions & London Dispersion Forces

Hexanone = Dipole-Dipole Interactions & London Dispersion       Forces

Hexane =   Only London Dispersion Forces

Strength of Intermolecular Forces:
Hydrogen forces are stronger than Dipole-Dipole Interactions, and Dipole-Dipole Interactions are stronger than London Dispersion Forces.

Result:
Hence, due to presence of strong Hydrogen Bond Interactions Hexanol has the highest Boiling Point.

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3 years ago

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