CHEM103 Chapter Notes - Chapter 12: Emulsion, Viscosity, Silicon Dioxide

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amethystjellyfish251

3 Jan 2016

School

University of Alberta

Department

Chemistry

Course

CHEM103

Professor

John Veinot

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CHEM103 Full Course Notes

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Chapter 12 intermolecular forces: liquids, solids, and phase changes. Intermolecular forces have different effects on a molecule at the surface than on one in the interior. An interior molecule is attracted by others on all sides. A surface molecule is only attracted by others below and to the sides, so it experiences a net attraction downward. The only way to increase the surface area is for molecules to move up by breaking attractions in the interior, which requires energy. Surface tension energy required to increase the surface area and has units of. The stronger the forces b/w particles, the more energy it takes to increase the surface area, so the greater the surface tension. Water has a high surface tension b/c its molecules form multiple h bonds. Surfactants - (soaps, petroleum recovery agents, fat emulsifiers) decrease the surface tension of water by congregating t the surface and disrupting h bonds.

Related Questions

What is surface tension? Why do molecules at the surface of a liquid behave differently from those within the interior? Answer by selecting ALL true statements.

A) A molecule at the surface has a higher potential energy than a molecule in the bulk of the liquid.

B) A molecule at the surface has a lower potential energy than a molecule in the bulk of the liquid.

C) Surface tension is not related to the energy needed to increase its surface area.

D) Surface tension is related to the tendency of a liquid to maximize its surface area.

E) Surface tension is related to the tendency of a liquid to minimize its surface area.

F) Surface tension is directly proportional to the energy needed to increase its surface area.

I've tried a combination of B, E, and F, but they were incorrect. Please help me figure out what I am missing or have mistakened.

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 __________ ________.

CHEM103 Chapter Notes - Chapter 12: Emulsion, Viscosity, Silicon Dioxide

CHEM103 Full Course Notes

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