Question

*Explanations should be brief. Draw a box around each final answer, if applicable.* 1. Consider intermolecular forces and kinetic energies with respect to a solid and a liquid. Explain why molecules in a liquid are free to move past each other, while molecules in a solid are held in fixed positions. 2. Use your knowledge of intermolecular forces to provide an explanation for why the boiling point of 2-hexanol is higher than the boiling point of 2,3-dimethyl-2-butanol. Be sure to consider all intermolecular forces in the molecules. 3. Considering intermolecular forces, which of the following liquids has the highest vapour pressure: acetone, methanol, water, ethyl ether, or ethanol? Explain your reasoning. 4. The surface tension for water at 20°C is 72.8 mN/m and at 100 °C the surface tension is 58.9 mN/m. Provide an explanation for why the surface tension of water decreases as the temperature increases. 5. In each of the following scenarios, compare Liquid A and Liquid B and decide which has a higher viscosity. Explain your reasoning. A B Both liquids are alkanes, but liquid A has a much higher molecular weight than liquid B. Liquid A is a ketone, while liquid B is an alcohol of similar molecular weight 6. Suppose you are told that a particular solid has a high melting point. What other information would you need about the properties of the solid in order to distinguish whether that solid is a covalent network solid, a metallic solid, or an ionic solid? Explain your reasoning.

Answer 1

Page No (Date Answer o are bonded it has In_salıd slate, ałom/ panticle by strong janic and metallic bond eveny atom_is_in fixed position, the posihon is called lattice point, there is no mouments of its alom only; vibrahan of otomoccur at lattice point veny less kinetic energy In liquid - stałe, there is weak Intermolecular Hydrogen- banding and weak-vandex-wall force' of attraction. Hence, molecules in a liquid are free to move past each other the molecule bave some velocity Hence, it is hos greater kinelic energy Kinetic energy - 4 my? since memass V=velocity OH OH 4 6 3 4 2- hexanol 23-dimethyl- 2-butanol boiling point of - 2-hexanol is higher than boiling point of - 2-3-dimethyl-2-butanol the CS Scanned with CamScanner

Page No Date 2- hexanol has 90 alcohol while 2,3-dimethyl- 2-butanol has 30. alcohol Hence there is goed - Habond canding in 2-hexonal due to less -hindrance Hence, high boiling point than 23. dimethyl-23 butanol anathes - concept is surface, energy 9-hexanol has high energy (surfacé energy because it has high-surface onea while. 2,3-dimethyl-2; butanol has less surface hence, less boiling point Oca CS Scanned with CamScanner