CHEM 1000 Chapter Notes - Chapter 5: Collision Frequency, Barometer, Pressure Measurement

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3 Apr 2019

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Not readily observable (mass of molecules, molecular speed, collision frequency) Pressure gaseous atoms/ molecules exert a force when they collide with surface. Simplest way to measure gas pressure is to have it balance a liquid pressure (due to gravity) Si units for pressure is the pascal (pa) If pressure is due to gravitational force, f= mg. P = f/ a f= force a= area. P= hdg h= height d= density g= gravitational constant. Tube closed at one end, fill with hg, inverted into a pool of hg. Weight of hg causes level in tube to drop until phg = patm. P = atmospheric pressure h = height of liquid column d = density of the liquid. Average pressure at sea level will support a column of 760mm of mercury. International union of pure and applied chemistry (iupac) has defined standard pressure as exactly 100 000 pa = 1 bar.

Related Questions

Show all the steps:

1) what will be the hydrogen pressure?

2) what will be the mass of Magnesium?

3) what will be the moles of hydrogen?

4) what will be percent by mass Mg?

can someone help me with this showing all steps? Thanks in advance.

Percent Magnesium in a Mixture Background In th is experiment you will determine the percent magnesium in a mixture containing only magne- sium and zine by reacting the sample with hydrochloric acid and measuring the volume of hydroger gas evolved. The reactions are: From the volume of hydrogen collected and its temperature and pressure, gen generated can be calculated. Using the stoichiometric relationships shown in the reactions above and knowing the total mass of zinc and magnesium, equations can be set up to solve for the individu al masses of the metals. the total moles of hydro- Determining the pressure of the hydrogen is a litle bit tricky. The hydrogen is collected over acid solution in a long calibrated tube called a gas measuring tube or eudiometer whi a beaker of water. The hydrogen pressure is not the barometric pressure. The total pressure in the eudiometer a ch is inverted in t the level of the liquid in the beaker is equal to the barometric pressure. This is the gas pressure plus the pressure due to the acid column above the liquid level in the beaker. To deter- mine the gas pressure barometric pressure. The column abo ure the pressure due to the acid column must be found and subtracted from the pressure of the acid column can be found by measuring the height of the ve the level of liquid in the beaker. Since we measure pressure as the height of a mercury column, the acid column height must be converted to mm Hg. The height of a liquid column sup- ported by a given pressure is inversely proportional to the density of the liquid. The density of the acid in the eudiometer is 1.05 e/mL and the density of mercury is 13.6 2/mL. Since the gas above the acid solution is hydrogen plus be subtracted from the gas pressure to get the pressure of the hydrogen alone. This is the pressure you will use in your calculations. Aqueous vapor pressures can be found in the table in Appendix C in your lab manual, or in the CRC Handbook which is available from the stockroom. water vapor and not pure hydrogen, the aqueous vapor pressure must pensi mercurs- 13.69/mL Volu me gas53. a melnic pressure 30 psi heiant of acal column 35.3 cm mass ââ corlonel metals= o.or68q

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 1000 Chapter Notes - Chapter 5: Collision Frequency, Barometer, Pressure Measurement

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