CHEM 023 Lecture Notes - Lecture 29: Intermolecular Force, Boiling Point, Partial Pressure

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raspberrymole837

18 Nov 2016

School

University of Vermont

Department

Chemistry

Course

CHEM 023

Professor

Flemer

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Document Summary

The pa(cid:396)tial p(cid:396)essu(cid:396)e of a li(cid:395)uid"s (cid:448)apo(cid:396) i(cid:374) dy(cid:374)a(cid:373)i(cid:272) e(cid:395)uili(cid:271)(cid:396)iu(cid:373) (cid:449)ith its li(cid:395)uid phase. Higher volality= higher vapor pressure = lower boiling point = lower intermolecular forces. Lower volality= lower vapor pressure = higher boiling point = higher intermolecular forces. **the boiling point of a liquid is the temperature at which its vapor pressure is the same as atmospheric pressure** Condensation is an exothermic process (cid:862)the heat of (cid:448)apo(cid:396)izatio(cid:374)(cid:863) (cid:894)a(cid:374)d (cid:272)o(cid:374)de(cid:374)satio(cid:374)(cid:895) Used in describing temperature increase within a specific phase (ie. q= m (cid:272) t. Used in describing a phase change between a liquid and a gas. Calculate the amount of water (g) at its boiling point that can be vaporized with 155 kj of heat. M = __q__ = 155 kj = 68. 6 g ccccc hvap 2. 26kj/g. Freezing is an exothermic process (cid:862)heat of fusio(cid:374)(cid:863: hfus, q= m hfus. Used in describing phase change between a solid and a liquid.

Related Questions

Which of the following statements is false?

The viscosity of a liquid decreases as temperature increases.

The vapor pressure of a substance increases as temperature increases.

The vapor pressure of a substance with strong intermolecular forces is greater than that of a substance with weak intermolecular forces (at the same temperature).

A substance boils when its vapor pressure is equal to the atmospheric pressure.

The boiling point of water increases as atmospheric pressure increases.

The half-life for a reaction that is first-order in A is 15 minutes. How long will it take for the concentration of A to change from 0.16 M to 0.040 M?

A(g) â B(g) + C(g)

		60 min
		45 min
		30 min
		23 min
		15 min

WORD BANK:

Atomic solids

Body-centered cubic

Boiling point

Condensation

Covalent atomic solids

Crystal lattice

Crystalline solids

Distillate

Distillation

Dynamic equilibrium

Evaporation

Face-centered cubic

Freezing

Freezing point

Ionic solids

Intramolecular

Interionic forces

Intermolecular forces

Liquid State

Macromolecule

Melting

Melting point

Metallic atomic solids

Molar heat of fusion

Molar heat of vaporization

Molecular solids

Non-bonding atomic solids

Non-crystalline (amorphous) solids

Properties of Liquids

Properties of Solids

Simple cubic

Solid State

Sublimation

Surface tension

Surfactants

Vapor pressure

Vaporization

Viscosity

Wetting action

Use the Vocabulary words above to complete the following sentences words can be used more than once, some words are not be used.

d. The molecules of a ________ are in constant motion. e. The __________ of a liquid is related to the shape of the molecules that make up the liquid. f. The force of attraction that causes the surface of a liquid to contract and form a âbeadâ or spherical drop is called? _________ _______ g. Chemical that reduce surface tension are called? __________ h. A liquids ability to spread out evenly over a surface as a thin film is called itâs? _________ _______ i. ____________ is the process by which molecules of a liquid break away and go into the gas phase. j. When the molecules of a volatile liquid jump to gas phase it is called _________. k. The reverse of evaporation (the conversion of a vapor to a liquid) is called? _________ l. When the rate at which the water is evaporating is equal to the rate at which the water vapor is condensing, you have established a __________ _________. m. ________ _______ is the partial pressure of a gas in dynamic equilibrium with its liquid. n. ________ _______ is when the vapor pressure equals the atmospheric pressure. o. Boiling point can be used to purify a solution of two or more substances by ________. p. The condensed vapor sample is called the? ________ q. The exact quantity of heat required to vaporize 1 mole of a liquid at constant pressure and temperature is called the ________ ________ ___ __________. r. In ________________ __________ the particles do not have a definite or regular order (there is no repeating pattern throughout the solid). s. In ____________ __________, the particles are arranged in regular, systematic patterns called a ________ _________. t. The three different types of crystal lattices based on the cube are? ________ ______, _____________ ______, and ___________, ________. u. The three types of atomic solids include _________ _____, ___________ ______, and __________ ________.

CHEM 023 Lecture Notes - Lecture 29: Intermolecular Force, Boiling Point, Partial Pressure

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