Monday, November 5, 2007

2007 Chapter 11

Questions on the material covered in Chapter 11? Leave a comment here.

10 comments:

Anonymous said...

Just a question... do you ever teach Chemistry 102? If so might you teach it next semester?

Thanks!

PS:Love your class

Scott McIndoe said...

Thanks for the feedback. I don't teach Chem102, though I'm the only 101 instructor not to - Drs Briggs, Chak & Codding will be teaching 102 next semester.

Anonymous said...

I am not in the class, but it would be useful if u can give me the multiple choice answers for the other sample midterm you posted.

Thanks

Anonymous said...

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Anonymous said...

I'm assuming that London forces not only depend on molecular weight but also on Zeff right? I mean...if we have higher Zeff the electrons won't be so free to move around...thanks!

Scott McIndoe said...

Certainly the polarizability of the atom/molecule is important (and this has to do with how easily the electrons can move in response to an instantaneous dipole), but Zeff is less important than number of electrons: O2 has a higher boiling point than N2, because it has more electrons and this makes up for the fact that they're held more tightly.
So I would say molecular weight and molecular shape are the most important factors (in that order).

Anonymous said...

Hi I was wondering whether the midterm will cover superconductors

Scott McIndoe said...

No, it won't.

Anonymous said...

A practice exam I bought has this question:

A covalent-network solid is characterized by:

A) high mobility
B) low melting point and softness
C) High melting point and poor electrical conductivity
D) Charged particles throughout
E) Good electrical conductivity

The answer (they say) is B...is this correct? The textbook says covalent-networks exhibit high melting points and hardness.

Scott McIndoe said...

No, that answer is wrong - it should be C. The marked finals are produced in good faith by the student society but unfortunately do contain errors.