Master Chemistry with Premium Notes, Assignments, and Lab Reports – Now Available on Stuvia!
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Course
200.BA
Institution
Collège Ahuntsic (
)
Master Chemistry with Premium Notes, Assignments, and Lab Reports – Now Available on Stuvia!
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General Chemistry 202-NYA-05 – Midterm 2 – Subject A
MIDTERM 2 – Subject A
GUIDELINES:
Date: Wednesday Nov. 23rd, 11:00 – 13:00.
- You are authorized pen, draft paper, eraser and a non-programmable calculator.
- You will find the values of fundamental constants, the periodic table, a diagram of the
electromagnetic spectrum and a summary of molecule geometries at the end of the booklet.
PART I: Direct Applications (42 points)
Short questions which can be directly answered using the notions seen in class. Be careful to answer the
question properly and completely. Write your answers without justification unless otherwise specified!
1) Fill out the following table. (10 points)
Atom Z # electrons Electron configuration
Ca 20 20 [Ar]4s2
B 5 5 [He] 2s22p1
Ir 77 77 [Xe] 6s24f745d7
Cr 24 24 [Ar] 4s13d5
Ga+ 12 11 [Ne] 4s23d10
At- 85 86 [Xe] 6s24f145d106p6
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, General Chemistry 202-NYA-05 – Midterm 2 – Subject A
2) Indicate the maximum number of electrons in an atom that can have these quantum numbers: (8
points)
a) n = 3 18
b) n = 6, ml = +1 6
c) n = 5, l = 0 2
d) n = 2, l = 1, ml = 0, ms = +1/2 1
3) Order the following atoms. (6 points)
a) By order of increasing ionization energy: Al, Ga, S, F
Ga, Al, S, F
b) By order of decreasing electronegativity: Cl, Se, F, Br
F, Cl, Br, Se
c) By order of increasing radius: Ca2+, Ar, S2-, K+
.
Ca2+, K+, Ar S2-
4) Write one Lewis structures that obey the octet rule for the following species. Assign formal charge if
necessary. (12 points)
a) ClO3-
# valence e- = 7 + 3 x 6 + 1 = 26
b) SO2F2 (S is the central atom)
# valence e- = 6 + 2 x 6 + 7 x 2 = 32
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