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- 1. Multiple ChoiceThe electron geometry is the same as the molecular shape when there are no lone pairs of electrons on the central atom.TrueFalse¯\_(ツ)_/¯#chem4eva
- 2. Multiple ChoiceThe basic fact that determines molecular shapes is thatnuclei attract each other.electron pairs attract each other.electron pairs repel each other.nuclei repel each other.
- 3. Multiple ChoiceLone pairs around the oxygen atom of a water molecule play no role in determining its molecular geometry which has what shape?True;
bentFalse;
bentTrue;
linearFalse;
linear - 4. Multiple ChoiceThe bond angle in NH3 is __________ than the bond angle in CH4 becauseLARGER; the unshared pair of electrons on nitrogen is LESS repulsive to the bonded electron pairs.SMALLER; nitrogen has a SMALLER atomic radius than carbon.LARGER; nitrogen has a LARGER atomic radius than carbon.SMALLER; the unshared pair of electrons on nitrogen is MORE repulsive to the bonded electron pairs.
- 5. Multiple Choice
Which of the following most likely represents the molecular geometry of water?ABCD - 6. Multiple ChoiceWhich of the following molecules do NOT match their molecular geometry?
I. BeH2: bent
II. NH3: trigonal pyramidal
III. CF4: tetrahedral
IV. NH4+: tetrahedralI onlyI and II onlyII, III, and IV onlyAll are paired correctly. - 7. Multiple ChoiceWater has a bent molecular geometry becausethere are unpaired electrons within the bonds.the two O-H bonds repel each other.oxygen does not have d-orbitals to allow for an expanded octet.there are 4 electrons on the oxygen atom which are not in the O-H bonds but which affect molecular shape.
- 8. Multiple ChoiceLewis structures can sometime be deceptive when determining molecular shape because they are drawn in two-dimensions. Examine the Lewis structures. Which is not linear and why?CO2 because it has double bondsBeCl2 because beryllium is an exception to the octet ruleH2S because it has lone pairs on the central atomAll are linear
- 9. Multiple ChoiceUse VSEPR theory to predict the molecular shape of the molecule SeF6.tetrahedraloctahedraltrigonal-planartrigonal-bipyramidal
- 10. Multiple ChoiceWhat is the name of the molecular geometry shown below? (The dark circle and each white circle represent an atom.)trigonal pyramidalbenttetrahedraloctahedral
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