4. Identify the most important type of noncovalent interaction for each of the f

Question

4. Identify the most important type of noncovalent interaction for each of the following BaSO, (a salt), Ar, NO2, and HF. Explain why the following compounds have different boiling points: HCI-8 C), HF (20 C TICL, (nonpolar, 136 C), and CsCI (a salt, 1290 °C) 6 Identify which of the following does not form hydrogen bonds: HF, H,O, CH, and NH, Explain. s all C+H GoT It! 3. Do you expect that adding an electronegative atom to an alkane will increase or decrease the boiling point? Explain. 4. Do you expect that adding a hydroxyl group to an alkane will increase or decrease the boiling point? Explain. 189 Activity 10-1 Interactions between Atoms and Molecules

Explanation / Answer

1. BaSO4 electrostatic force of attraction

Ar London force of attraction

NO2 dipole - dipole interaction

HF hydrogen bonding

2. HCl - hydrogen bonding is weak since electronegativity of Cl is less, hence its a gas at room temperature and has low boiling point.

HF - due high electronegativity of F atoms there is an extensive inter molecular hydrogen bonding between the molecules hence liquid at room temperature, hence has higer boiling point.

TiCl4 - is a covalent non polar molecule, since covalent bond is much stronger than the van der waals forces it has higer boiling point than HCl and HF.

CsCl - is an ionic compound, since breaking an electrostatic force of attraction between the two ions require more energy it has higer boiling point than covalent compounds and others.

3. Hydrogen bond is the type of weak van der waals force existing between H and highly electronegative elements like F N and O.

Hence CH4 which is a covalent molecule doesn't contain electronegative elements mentioned above doesn't have hydrogen bond.

The only type of intermolecular attraction in alkanes is London force of attraction.

4. Yes there is an increase in boiling point, because addition of a electronegative element increases the molecular weight of the compound, increase the polarity of the molecule hence the intermolecular forces increases I,e hydrogen bonding, due to larger size of electronegative elements the surface area increases, due to all these reasons boiling point increases.

5. Yes boiling point increases. Since OH induces polarity in the molecules there is an intermolecular force of attraction build between the molecules, due to its larger size(OH size) surface area increases, molecular weight also increases all these contribute towards the increase in boiling point.

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