Midterm Chemistry Test
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CH225 Midterm (35%)
Aids allowed: Periodic Table
1.
(3) Arrange the following elements in the order of increasing electron affinity: Cl, He, K, S, Li
2.
(3) Knowing the atomic radii of C (0.77 Å), Si (1.18 Å), Cl (0.99 Å) and Al (1.43 Å), arrange the following
single bonds in the order of increasing bond length: C–Si, C–Al, C–Cl, Si–Cl, Al–Cl,
H
H
H
H
O
CH
O
3
H
Sn
P
H
B
Cl
Be
P
O
H
F
F
CH
Cl
O
H
C
3
F
H
3
F
CH
H
3. (3) Circle all dative bonds in the following species:
3
H
4. (4) Determine the formal oxidation states for all atoms in the following molecules and ions:
CaH
OS:
Ca ____
H_____
2
SOCl
OS:
S_____
O_____
Cl_____
2
3–
[H
Si
O
]
OS:
H_____
Si_____
O_____
3
2
7
F
B-NH
OS:
F_____
B_____
N_____
H_____
2
2
Li[AlCl
H
]
OS:
Li_____
Al_____
Cl_____
H_____
2
2
5. (6) Use VSEPR rules to predict the structure and shape of the following molecules. Prepare clear
structural drawings showing all atoms, bonds, as well as lone pairs on the central atom (if present). Do
NOT show any other electrons. Name the shapes.
2–
̶
[BeCl
F
]
[ClO
]
BrF
2
2
2
5
Molecular shape:
1
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