Question

In the following diagram, solid lines represent covalent bonds while dotted lines represent non-covalent interactions. Which of the depictions of molecules show a hydrogen bonding interaction. Check all systems that apply.

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Your Answers:

     H—H
—N‧‧‧‧‧H—O—
—C‧‧‧‧‧H—F—
—O‧‧‧‧‧H—C—

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Question 14

Identify which of the following molecules have a net dipole moment:

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Your Answers:

CCl₄
CH₂Cl₂
(CH₃)₂O
CO₂
BF₃

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Question 15

Determine the predominant intermolecular force in each of the following substances:

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Your Answers:

System	Predominant Intermolecular Force
NH3	Hydrogen Bonding    Dipole-Dipole    Dispersion
CH4	Hydrogen Bonding    Dipole-Dipole    Dispersion
Acetone	Hydrogen Bonding    Dipole-Dipole    Dispersion
Isopropanol	Hydrogen Bonding    Dipole-Dipole    Dispersion
H2O	Hydrogen Bonding    Dipole-Dipole    Dispersion

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Answer 1

A hydrogen bonding is a weak electrostatic force of attraction between a hydrogen atom which is bound to a more electronegative atom such as N or O or F

—N‧‧‧‧‧H—O— is the such hydrogen bond.

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CCl4 - tetrahedral in shape ---> resulting zero dipolement
CH2Cl2 -- tetrahedral in shape ,but all the bonds are not equal ---> resulting net dipolement
(CH3)2O ----> liner shape -->resulting zero dipolement
CO2 ----> liner shape -->resulting zero dipolement
BF3 ---->planar triangular shape -->resulting zero dipolement

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NH3 ----- Hydrogen Bonding

CH4 ----- Dispersion

Acetone ------ Dispersion

Isopropanol ----- Hydrogen Bonding

H2O -------Hydrogen Bonding