Molecular Attractions - Chemistry Worksheet With Answers
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4Name:_______________________ Per:_____
Molecular Attractions-
“Are you attracted to me?”
Part I: The image to the right shows an artist’s rendition of
the demo performed in class. Answer the following questions:
1.
How did the ruler/ wand become negatively charged?
2.
Why are the water molecules slightly charged?
3.
Explain why water seemed to “move” towards the charged
ruler/wand in the demo.
4.
Do you think all liquids would behave this way next to a charged ruler/ wand? Explain.
Part II: Activity- How Molecules relate
Directions:
a. Look at your cutouts and determine if each molecule is polar or non-polar. If Polar, mark
the partial charges on each molecule.
b. Start with the water molecule cut-out and then use the other laminated cut-outs provided
to help determine how each molecule would align itself to a water molecule.
In the table below, sketch how each molecule would interact with a water molecule (draw with correct shape
& charge):
a. H
O + H
O
b. H
O + HF
c. H
O +HCl
d. H
O + NH
e. H
O + H
S
2
2
2
2
2
3
2
2
f. H
O + CF
g. H
O + CH
O
h. H
O + CHF
i.
H
O + CH
O
j.
H
O + NaCl
2
4
2
2
2
3
2
4
2
Background Information:
In trying to understand how our sense of smell works, scientists realized that molecular shape alone does not
fully explain why certain molecules smell and others do not. Molecular interactions (due to polarity) between
molecules that smell and the receptor sites in the nose lining seem to also play a role.
Below is a chart showing some molecules that have a smell and some that have no smell:
Molecule
N
PH
CH
H
Se
NH
HBr
CO
AsH
2
3
4
2
3
2
3
Has a smell?
No
Yes
No
Yes
Yes
Yes
No
Yes
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