1. Which intermolecular force tends to be the strongest? dispersion forces a. b.
ID: 566638 • Letter: 1
Question
1. Which intermolecular force tends to be the strongest? dispersion forces a. b. c. d. dipole-dipole forces hydrogen bonds van der Waals forces 2. What is the most important force present when an ionic compound dissolves in water? a. dispersion forces b. dipole-dipole forces c. hydrogen bonds d. ion-dipole forces 3. What phase transition is described by the following: molecules in motion and very close together going to a state of no motion? a. melting b· freezing c. deposition d. sublimation 4. Which of the following are associated with the liquid state? has a specific volume a. b. c. d. assumes the shape of the container essentially incompressible all of the above 5. A dispersion force is the attractive force between a. b. c. d. an ion and a dipole an instantaneous dipole and an induced dipole two permanent dipoles two molecules with hydrogen bonded to an oxygen atom True (+) or False (0) (2 pts each) 6. Deposition is an exothermic process. 7. All substances become more soluble in water as the temperature increases. 8. Osmosis is the net movement of solute molecules from the less concentrated solution to the more concentrated solution. 9. Solutions will only form if the dissolving process is exothermic. 10. Paint is a colloid. 11. Sublimation is an endothermic process. 12. Water cannot boil below 100°C.Explanation / Answer
1. Strongest intermolecular force among these is Hydrogen bonding
2. When an ionic compound dissoves in water, ion-dipole forces are the most important
3. Molecules in motion and very close together, that means this is a liquid phase and molecules in a state of no motion is solid state. Therefore, transition from liquid to solid happens by freezing.
4. Liquids have all the mentioned properties, thus option (d) is correct. They have specific volume, takes the shape of container they are poured in and are incompressible
5. Dispersion forces are weak attractive forces between temporary induced dipoles, i.e. option (b) is correct
6. TRUE. Deposition releases energy and thus is exothermic
7. TRUE. Increase in temperature increases the kinetic energy of substances, thus increasing their solubility ( although for gases, solubility decreases with rise in temp.)
8. FALSE. Osmosis is movement of solvent from regions of low solute concentration to high solute concentration across the semi-permeable membrane
9. FALSE. It may be endothermic or exothermic
10.TRUE. Paint is a colloid ( it shows Tyndall effect)
11.TRUE. Sublimation requires energy and hence is endothermic
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