The following answers were given by two students in response to a question about

Question

The following answers were given by two students in response to a question about the polarity of the molecule CH2F2:

The following answers were given by two students in response to a question about the polarity of the molecule CH2F 1. Steve: CH F: is a nonpolar molecule. It is symmetrical and therefore has no difference in polarity across the molecule, as seen in my drawing: H-C-H Mark: CH F is a polar molecule. It is not symmetrical and therefore has a partial positive side and a partial negative side, as seen in my drawing: H-C-F: Do you agree with Mark or Steve? Determine who is correct and explain why. Then, propose a more effective way for them to draw the CHFz molecule so that they can more easily determine molecular polarity. 2 List at least 3 structural properties of molecules that were not accurately represented by the model kits

Explanation / Answer

both structures are correct . those two are lewis structures . but steeve statement non-polar is wrong . we can represent both structures

CH2F2 is polar molecule .This is because there are two different kinds of bonds, which are two C-H bonds and

two C-F bonds. There is a net polarity to the molecule because of this.

2) three structural properties :

(i) a polar molecule will tend to have a higher boiling point. This is due to the fact that there is more energy that needs to be invested into the polar bonds to get the molecule to heat up enough to boil. Basically, the more polar the molecule is, the more energy is needed to get it to boil.

(ii) its dipole moment is not zero

(iii) there are dipole -dipole forces acting between these two

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