Chemistry Practice Problems Intermolecular Forces and Physical Properties Practice Problems Solution: Ethylene glycol (HOCH2CH2OH) and pentane (C5H12) a...

Solution: Ethylene glycol (HOCH2CH2OH) and pentane (C5H12) are both liquids at room temperature and room pressure, and have about the same molecular weight.One of these liquids is the major component in antifreeze in automobile engines. Which liquid would you expect to be used as antifreeze?

Problem

Ethylene glycol (HOCH2CH2OH) and pentane (C5H12) are both liquids at room temperature and room pressure, and have about the same molecular weight.

One of these liquids is the major component in antifreeze in automobile engines. Which liquid would you expect to be used as antifreeze?

Solution

We are being asked to determine which liquid will be used as an antifreeze.


Antifreeze is an additive that lowers the freezing point of a water-based liquid. An antifreeze mixture is used to achieve freezing-point depression for cold environments. So, a good antifreeze is a compound with a low freezing point. 


Freezing point 

 the temperature at which a liquid change into solid
influenced by intermolecular forces between molecules


Intermolecular Forces (IMF) are the attractive forces between 2 molecules.

Ion-dipole

strongest IMF
▪ deals with the attraction between an ion and a polar compound.

 Hydrogen Bonding

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