Name: Tutorial 3 Answer Sheet Answer the following questions and hand in this an

Question

Name: Tutorial 3 Answer Sheet Answer the following questions and hand in this answer sheet to your instructor. 1. Thedashed line in each ofthe diagramsbelow represents an intermolecularattraction (force). Indicate for each whether or not it represents Hydrogen Bonding and state your reasoning in each case. d. e. H-0 2. What is the predominant IMF for each of the substances listed below. Your choices are a) London Dispersion b) dipole- dipole and c) Hydrogen Bonding. State your reasoning in each case. 2a. C,H, onclon 2b. HBr 2c. H,O 2d. Di pole H-Bandin

Explanation / Answer

1. Intermolecular H- bonding occurs between an electronegative element ( of one molecule) and a H atom attached to an electroegatove element ( like O,N, S, halogen etc.) of another molecule.

(a) here the bond is between an electronegative element O and a Hydrogen that is attached to carbon ( which is not electronegative). SO, it is not H- bond

(b) here the bond is between an electronegative element O and a Hydrogen that is attached to oxygen ( which is electronegative). SO, it is H- bond

(c) here the bond is between an electronegative element N and a Hydrogen that is attached to nitrogen ( which is electronegative). SO, it is H- bond

(d) here the bond is between an electronegative element N and a Hydrogen that is attached to nitrogen ( which is electronegative). SO, it is H- bond

(e) here the bond is between an electronegative element O and a Hydrogen that is attached to oxygen ( which is electronegative). SO, it is H- bond

(f) here the bond is between an electronegative element O and a Hydrogen that is attached to carbon ( which is not electronegative). SO, it is not H- bond

2 a. C9H20: London dispersion forces

b. HBr : Dipole - Dipole

c. H2O : H- bonding

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