Post on 01-Oct-2020
The symbol for an element is being changed to “Ah.” If the valence electron configuration for its homonuclear diatomic molecule (Ah2) is the element’s current symbol is:
(2s)2(2s*)2 2px 2py
1. Li
2. Be
3. B
4. C
5. N
6. O
7. F
1
The symbol for an element is being changed to “Ah.” If the valence electron configuration for its homonuclear diatomic molecule (Ah2) is the element’s current symbol is:
(2s)2(2s*)2 2px 2py
1%
6%
5%
14%
55%
8%
10% 1. Li
2. Be
3. B
4. C
5. N
6. O
7. F
2
If Gf < 0, a compound is
__________ relative to its elements.
1. stable
2. unstable
3
If Gf < 0, a compound is
__________ relative to its elements.
1. stable
2. unstable
stable
unstable
31%
69%
4
Predict the S value for
2NaHCO3(s) Na2CO3(s) + CO2(g) + H2O(g)
1. S = 0 kJ/ K mol
2. S = +0.334 kJ/K mol
3. S = -334 kJ/K mol
5
Predict the S value for
2NaHCO3(s) Na2CO3(s) + CO2(g) + H2O(g)
10%
87%
4% 1. S = 0 kJ/ K mol
2. S = +0.334 kJ/K mol
3. S = -334 kJ/K mol
6
Which is a possible plot if both ΔH and ΔS are negative?
∆G°
kJ/
mol
0
T[K] T*
1. 2.
∆G°
kJ/
mol
0
T[K] T*
∆G°
kJ/
mol
0
T[K] T*
∆G°
kJ/
mol
0
T[K] T* 3. 4.
1.
2.
3.
4.
7
4%
2%
4%
90%
Which is a possible plot if both ΔH and ΔS are negative?
∆G°
kJ/
mol
0
T[K] T*
1. 2.
∆G°
kJ/
mol
0
T[K] T*
∆G°
kJ/
mol
0
T[K] T*
∆G°
kJ/
mol
0
T[K] T* 3. 4.
1.
2.
3.
4.
8
For a reaction with H < 0 and S > 0,
the reaction will
1. Never be spontaneous
2. Always be spontaneous
3. Sometimes be spontaneous (depending on
reaction temperature)
9
For a reaction with H < 0 and S > 0,
the reaction will
6%
89%
5% 1. Never be spontaneous
2. Always be spontaneous
3. Sometimes be spontaneous (depending on
reaction temperature)
10
Based on the orientation shown, how many
hydrogen bonds form between A and T bases?
1. 1
2. 2
3. 3
4. 4
5. 0
11
Based on the orientation shown, how many
hydrogen bonds form between A and T bases?
1. 1
2. 2
3. 3
4. 4
5. 0
1. 2. 3. 4. 5.
2%
67%
0%2%
29%
12
Name the hybridization of the specified
carbon and oxygen atoms in ATP.
N
CH
N
C
C
C
N
HC
N
NH2
HC CH
CH
O
HC
CH2O
OH OH
a
PPPPPP
b
10
1. C is sp2, O is sp3
2. C is sp3, O is sp2
3. C is sp3, O is sp3
4. C is sp2, O is sp2
5. C is sp2, O is not hybridized
6. C is sp3, O is not hybridized
13
17%
17%
17%
17%
17%
17%
Name the hybridization of the specified
carbon and oxygen atoms in ATP.
N
CH
N
C
C
C
N
HC
N
NH2
HC CH
CH
O
HC
CH2O
OH OH
a
PPPPPP
b
10
1. C is sp2, O is sp3
2. C is sp3, O is sp2
3. C is sp3, O is sp3
4. C is sp2, O is sp2
5. C is sp2, O is not hybridized
6. C is sp3, O is not hybridized
14
MIT OpenCourseWarehttp://ocw.mit.edu
5.111 Principles of Chemical ScienceFall 2014
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