Exam 11: Liquids, solids, and Intermolecular Forces

Ethyl chloride,C₂H₅Cl,is used as a local anesthetic.It works by cooling tissue as it vaporizes; its heat of vaporization is 26.4 kJ mol^-1.How much heat could be removed by 20.0 g of ethyl chloride?

Place the following substances in order of decreasing vapour pressure at a given temperature. PF₅ $\quad$ BrF₃ $\quad$ CF₄

-Based on the figure above,the boiling point of water under an external pressure of 0.316 $\text { bar }$ is _________ ${ } ^ { \circ } \mathrm { C } \text {. }$

What type of intermolecular force causes the dissolution of NaCl in water?

Which of the following forms an ionic solid?

The energy required to increase the surface area of a liquid by a unit amount is called ________.

Place the following substances in order of increasing vapour pressure at a given temperature. NF₃ $\quad$ NH_{3 $\quad$} BCl₃

Why is water an extraordinary substance?

Which of the following compounds has the highest boiling point?

Define volatile.

The heat of vaporization of water at 100 °C is 40.66 kJ mol^-1.Calculate the quantity of heat that is absorbed/released when 9.00 g of steam condenses to liquid water at 100 °C.

Consider the phase diagram shown.Choose the statement below that is TRUE.

Why does the temperature of a substance stay constant during a phase change such as vaporization?

Which one of the following has a low density?

Identify the type of solid for ice.

Which of the following substances should have the highest melting point?

Which of the following is considered a molecular solid?

The enthalpy change for converting 1.00 mol of ice at -60.0°C to water at 80.0°C is ___________ $\text { kJ. }$ The specific heats of ice,water,and steam are $2.09 \mathrm { Jg } ^ { - 1 } { } ^ { \circ } \mathrm { C } ^ { - 1 }$ $4.18 \mathrm { Jg } ^ { - 1 } { } ^ { \circ } \mathrm { C } ^ { - 1 }$ and $1.84 \mathrm { Jg } ^ { - 1 } { } ^ { \circ } \mathrm { C } ^ { - 1 }$ respectively.For $\mathrm { H } _ { 2 }$ O, $\Delta _ { \text {fus } } H$ = 6.01 kJ mol^-1,and $\Delta _ { \text {vap } } H = 40.67 \mathrm {~kJ} \mathrm {~mol} ^ { - 1 }$ .

Determine the vapour pressure (in mbar)of a substance at 29 °C,whose normal boiling point is 76 °C and has a Δ_vapH of 38.7 kJ mol^-1.

Define freezing.