CHEM 1451 - Exam 2 questions with answers

CHEM 1451 - Exam 2 questions with
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answers

Which of the following substances is/are typically made of
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molecules at the temperature and pressure? Select all
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that apply correctly.
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Helium gas, Chlorine gas, Bromine liquid, Iodine solid
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- Helium gas only
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- Chlorine gas and bromine liquid
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- Chlorine gas, bromine liquid and iodine solid
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- Bromine liquid only
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- Bromine liquid and iodine solid - CORRECT ANSWERS
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✔✔Chlorine gas, bromine liquid and iodine solid
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Which of the following formula would need a Roman
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numeral for naming? If none of the formulas need a
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Roman numeral, select (None).
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PCl3
CoCl2

,Ca3(PO4)2
SO2
None - CORRECT ANSWERS ✔✔CoCl3
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Which of the following compounds is classified as ionic
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compound? If none of them are ionic compounds, select
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(None).


HCl
NO
CH3OH
C6H12O6
None - CORRECT ANSWERS ✔✔None
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Select the shape around the N atom in CH3NH4+
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Linear
Bent with the bond angle of 120
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Trigonal planar |\




Bent with the bond angle of 109.5
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Trigonal pyramidal |\




Tetrahedral - CORRECT ANSWERS ✔✔Tetrahedral
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, Which of the following statements is correct? If non of
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them are correct, choose "None".
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-One NO3- has the total charge of negative one because it
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lost one proton
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- One P3- anion has the total charge of negative three
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because it lost three electrons |\ |\ |\ |\




- One NH4+ cation has the total charge of positive one
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because it gained one electron |\ |\ |\ |\




- One Ca2+ cation has the total charge of positive two
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because it gained two protons |\ |\ |\ |\




- None - CORRECT ANSWERS ✔✔None
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How many polar bonds are present in the following
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molecule? Lone pair electrons are not shown explicitly in |\ |\ |\ |\ |\ |\ |\ |\ |\



the structure. |\




If a double bond is polar, then count it as "one"
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