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【单选题】
下面给出五个化学键的力常数,如按简单双原子分子计算,则在红外光谱中波数最大者是 ( )
A.
A: 乙烷中C-H键,k=5.1 达因
B.
B: 乙炔中C-H键, k=5.9 达因
C.
C: 乙烷中C-C键, k=4.5 达 因
D.
D: CH 3 C ≡N中C≡N键, k=17.5 达因
E.
E: 蚁醛中C=O键, k=12.3 达因
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【单选题】已知下列单键伸缩振动中 C-C C-N C-O 键力常数 k /(N·cm -1 ) 4.5 5.8 5.0 吸收峰波长 λ/μm 6 6.46 6.85 则 C-C, C-N, C-O 键振动能级之差 ⊿ E 顺序为 ( )
A.
C-C > C-N > C-O
B.
C-N > C-O > C-C
C.
C-C > C-O > C-N
D.
C-O > C-N > C-C
【单选题】Passage One Gravity is a slippery beast. We don’t know how strong it is, how it works or how fast its effects move. But this year we made progress. October saw the most accurate measurem...
A.
Newton and Einstein had similar opinions on the speed of gravity
B.
the author of the passage is in favor of Einstein’s thought about the speed of gravity
C.
astronomers think that both Newton and Einstein were wrong on the speed of gravity
D.
Newton’s thought about the gravitational effect is out of date
【单选题】Gravity is a slippery beast. We don’t know how strong it is, how it works or how fast its effects move. But this year we made progress. October saw the most accurate measurement yet of Newton’s gravit...
A.
two things far apart might vibrate in unison
B.
the ripples in space-time are only imagined
C.
there exist gravitational waves
D.
abrupt, violent cosmic events lead to gravitational waves
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【单选题】已知下列单键伸缩振动中 C-C C-N C-O 键力常数 k /(N·cm -1 ) 4.5 5.8 5.0 吸收峰波长 λ/μm 6 6.46 6.85 则 C-C, C-N, C-O 键振动能级之差 ⊿ E 顺序为 ( )
A.
C-C > C-N > C-O
B.
C-N > C-O > C-C
C.
C-C > C-O > C-N
D.
C-O > C-N > C-C
【单选题】Passage One Gravity is a slippery beast. We don’t know how strong it is, how it works or how fast its effects move. But this year we made progress. October saw the most accurate measurem...
A.
Newton and Einstein had similar opinions on the speed of gravity
B.
the author of the passage is in favor of Einstein’s thought about the speed of gravity
C.
astronomers think that both Newton and Einstein were wrong on the speed of gravity
D.
Newton’s thought about the gravitational effect is out of date
【单选题】Gravity is a slippery beast. We don’t know how strong it is, how it works or how fast its effects move. But this year we made progress. October saw the most accurate measurement yet of Newton’s gravit...
A.
two things far apart might vibrate in unison
B.
the ripples in space-time are only imagined
C.
there exist gravitational waves
D.
abrupt, violent cosmic events lead to gravitational waves
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