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April 24, 2014

Homework Help: Chemistry(Please check)

Posted by Hannah on Friday, February 10, 2012 at 11:54pm.

1) The molecular mass of a substance was determined by the freezing point depression technique. The minimum data required for the determination are:

a) delta T and Kf only
b) delta T, Kf, and mass of solute
c) delta T, Kf, mass of solute, and mass of solvent
d) delta T, Kf, mass of solute, mass of solvent, and identity of solvent
e) delta T, Kf, mass of solute, mass of solvent and identity of mass and solvent.

I chose delta T, Kf, and mass of solute.

2)Ethanol and water are both liquids at or near room temperature. When a sample of ethanol is poured into a beaker containing water, the two liquids

a) are miscible because each can hydrogen bond with the other.
b) are immiscible because each has strong hydrogen bonds that cannot be broken.
c) are miscible because both are liquids and all liquids are miscible.
d) are immiscible because organic and non-organic compounds cannot mix.

I chose that they are miscible because each can hydrogen bond with each other.

Are these correct?

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