Portage CHEM 103 Study guide MOD 5 exam.

Question 1
pts
Click this link to access the Periodic Table. This may be helpful
throughout the exam.


Show the determination of the charge on the ion formed by the
P15 atom.
Your Answer:
1S2 2S2 2P6 3S2 3P5
P+3e ---> P-3
charge of P-3 is -3
P15 (nonmetal = gain electrons) 1s2 2s2 2p6 3s2 3p3
gain 3e → P-3


Question 2
pts
Click this link to access the Periodic Table. This may be helpful
throughout the exam.


H = 2.1
Li = 1.0 Be = 1.5 B = 2.0 C = 2.5 N=
3.0 O= 3.5 F = 4.0
Na = 1.0 Mg = 1.2 Al = 1.5 Si = 1.8 P=
2.1 S = 2.5 Cl = 3.0
K = 0.8 Ca = 1.0 Ga = 1.6 Ge = 1.8 As =
2.0 Se = 2.4 Br = 2.8


Using the electronegativities from the table above, show the
determination of the polarity of each different type of bond in the
following molecule




This study source was downloaded by 100000849580189 from CourseHero.com on 07-20-2023 04:30:45 GMT -05:00


https://www.coursehero.com/file/53292511/Portage-CHEM-103-Study-guide-MOD-5-examdocx/

, key Answer:

H-C bond electronegativity difference = 2.5 - 2.1 = 0.4 <0.5
bond is Nonpolar
C-O bond electronegativity difference = 3.5 - 2.5 = 1.0 1.6 - 0.5
bond is Polar


Question 3
pts
Click this link to access the Periodic Table. This may be helpful
throughout the exam.


On a piece of scratch paper, draw the Lewis structure for the CO3-2 ion.
Then choose the correct Lewis structure for CO3-2 from the options
listed below.




ANSWER: A


Question 4
pts
Click this link to access the Periodic Table. This may be helpful
throughout the exam.




This study source was downloaded by 100000849580189 from CourseHero.com on 07-20-2023 04:30:45 GMT -05:00


https://www.coursehero.com/file/53292511/Portage-CHEM-103-Study-guide-MOD-5-examdocx/