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#1
Nov 9 2009 05:00pm
Arrange the following AXn species in order of increasing X-A-X bond angles. (Use the appropriate <, =, or > symbol to separate substances in the list.)
PCl3, OCl2, SiCl62-, SiCl4, SCl2

This is [I assume] based on vespr hypothesis.

What I calculated (which I don't completely get the whole lewis dot structures and what shape it takes, so these could be wrong):
PCl3, 109.5
OCl2, <109.5
SiCl62-, 90
SiCl4, 109.5
SCl2, <109.5

Which would give me,
SiCl62- < OCl2 = SCl2 < PCl3 = SiCl4
also tried,
SiCl62- < OCl2 < SCl2 < PCl3 < SiCl4

However, both are incorrect. Fg for the correct answer. Only have one shot at it.

This post was edited by bob08 on Nov 9 2009 05:06pm
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#2
Nov 9 2009 05:18pm
Quote (bob08 @ Nov 9 2009 04:00pm)
Arrange the following AXn species in order of increasing X-A-X bond angles. (Use the appropriate <, =, or > symbol to separate substances in the list.)
PCl3, OCl2, SiCl62-, SiCl4, SCl2


SiCl4 >OCl2=SCl2 > PCl3 > SiCl62-

109 > 104.5 = 104.5 > 100 > whatever the angle of SiCl62- is

Not 100% but should be right...
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#3
Nov 9 2009 05:21pm
Quote (unghghgh @ Nov 9 2009 06:18pm)
SiCl4 >OCl2=SCl2 > PCl3 > SiCl62-

109 > 104.5 = 104.5 > 100 > whatever the angle of SiCl62- is

Not 100% but should be right...


...are you using the predicted molecular shape, or looking these angles up?
Can't go with a "should be right", especially with 104.5 and 100.. :\

This post was edited by bob08 on Nov 9 2009 05:23pm
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#4
Nov 9 2009 05:25pm
Quote (bob08 @ Nov 9 2009 04:21pm)
...are you using the predicted molecular shape, or looking these angles up?
Can't go with a "should be right", especially with 104.5 and 100.. :\


i did it by what i thought was right, then looked up the angles.

the numbers matched up the order I got, so I assumed those angles are right.
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#5
Nov 9 2009 05:28pm
Quote (bob08 @ Nov 9 2009 06:00pm)
Arrange the following AXn species in order of increasing X-A-X bond angles. (Use the appropriate <, =, or > symbol to separate substances in the list.)
PCl3, OCl2, SiCl62-, SiCl4, SCl2

This is [I assume] based on vespr hypothesis.

What I calculated (which I don't completely get the whole lewis dot structures and what shape it takes, so these could be wrong):
PCl3, 109.5  nonbonded electron will repel so under 109
OCl2, <109.5  the chlorides are too large on a small atom causing the bond angle to increase to ~110
SiCl62-, 90  bipyramid(?) shape so 90
SiCl4, 109.5  tetrahedral 109
SCl2, <109.5  the 2 non bonded pairs decreease bond angle a bit more than PCl3


so SiCl62-<SCl2<PCl3<SiCl4<OCl2

if this helps a bit http://www.dartmouth.edu/~genchem/0102/spring/6winn/VSEPR2.html

This post was edited by srevir on Nov 9 2009 05:30pm
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#6
Nov 10 2009 12:01am
Another opinion anyone? ;\
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#7
Nov 10 2009 08:33pm
Quote (bob08 @ Nov 9 2009 05:00pm)
Arrange the following AXn species in order of increasing X-A-X bond angles. (Use the appropriate <, =, or > symbol to separate substances in the list.)
PCl3, OCl2, SiCl62-, SiCl4, SCl2

This is [I assume] based on vespr hypothesis.

What I calculated (which I don't completely get the whole lewis dot structures and what shape it takes, so these could be wrong):
PCl3, 109.5
OCl2, <109.5
SiCl62-, 90
SiCl4, 109.5
SCl2, <109.5

Which would give me,
SiCl62- < OCl2 = SCl2 < PCl3 = SiCl4
also tried,
SiCl62- < OCl2 < SCl2 < PCl3 < SiCl4

However, both are incorrect. Fg for the correct answer. Only have one shot at it.


lmao, did a google search for my webassign and it points me to d2jsp... Ill repost if i get the answer :) i still have 3 tries ;)

Quote (srevir @ Nov 9 2009 05:28pm)
so SiCl62-<SCl2<PCl3<SiCl4<OCl2

if this helps a bit http://www.dartmouth.edu/~genchem/0102/spring/6winn/VSEPR2.html


Yeah thats wrong...2 tries left :(

This post was edited by xandumx on Nov 10 2009 08:36pm
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#8
Nov 10 2009 09:18pm
I got it brah


SiCl62-< SCl2 = OCl2 < PCl3 < SiCl4

This post was edited by bob08 on Nov 10 2009 09:20pm
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