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Models of Bonding & Structure B.2 The Covalent Model (id: b74b161d6)

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admin 发表于 2024-2-13 10:15:07 | 显示全部楼层 |阅读模式
本题目来源于试卷: Models of Bonding & Structure B.2 The Covalent Model,类别为 IB化学

[单选题]
Which molecule would be considered polar covalent?

A. $CO_2$
B. $NH_3$
C. $CH_4$
D. $SO_3$


参考答案:  B


本题详细解析:
The bonds between N and H are polar due to the difference in electronegativity.
The overall shape of the NH3 is asymmetrical (trigonal pyramidal), resulting in a molecule with a net dipole moment. $CO_2$ and $SO_3$ both have polar bonds, but the molecules are symmetrical. Therefore, they do not have net dipole moment.
The C-H bonds are not polar due to a small difference in electronegativity.

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