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# Chem Chap 11

### Gases - Section 1

the amount of force exerted per unit area of a surface Pressure
the SI unit for force; the force that will increase the speed of a 1 kg mass by 1 m/s each second that the force is applied (symbol, N) newton
an instrument that measures atmospheric pressure barometer
a unit of pressure millimeter of mercury
the pressure of Earth's atmosphere at sea level; exactly equivalent to 760 mm Hg atmosphere of pressure
the SI unit of pressure; equal to the force of 1 N exerted over an area of 1 m2 (symbol, Pa) Pascal
the pressure of each gas in a mixture partial pressure
the law that states that the total pressure of a mixture of gases is equal to the sum of the partial pressures of the component gases Dalton's law of partial pressure
The pressure exerted by a gas depends on volume, temperature, and the number of molecules present
The force per unit area on a surface Pressure (P)
What is the formula for Pressure Force / Area
The SI unit for force Newton
the shell of air surrounding Earth atmosphere
sum of the individual pressures of the various gases in the atmosphere atmospheric pressure
The first type of barometer was introducted by Evangelista Torricelli
at sea level and at 0°C, the average pressure of the atmosphere can support a 760 mm column of mercury
The atmospheric pressure at any given place depends on The elevation and the weather conditions
If the atmospheric pressure is greater than the average at sea level, the height of the mercury column in a barometer will be Greater than 760 mm
If the atmospheric pressure is less than the average at sea level, the height of the mercury column in a barometer will be Less than 760 mm
Used to measure the pressure of an enclosed gas sample manometer
symbolizes millimeter of mercury mm Hg
A pressure of 1 mm Hg is also called 1 torr in honor of Torricelli
Symbol Pa stands for Pascal
The formula for 1 Pa is 1 N / m2
1 torr = 1 mm Hg
Symbol atm stands for atmosphere
1 atm = 760 mm Hg ; = 760 torr ; 1.013 25 x 10 5 Pa ; 101.325 kPa
Symbol psi stands for Poiunds per square inch
1 psi = 6.892 86 × 10 3 Pa
1 atm relationship to a psi = 14.700 psi
Express an atmospheric pressure of 0.830 atm in millimeter of mercury mm Hg = 760 mm Hg; 0.830 atm x 760 mm Hg/atm = 631 mm Hg
Express an atmospheric pressure of 0.830 atm in kilopascals 101.325 kPa = 1 atm ; 0.830 atm x 101.325 kPa/atm = 84.1 kPa
The pressure exerted by each gas in an unreactive mixture is independent or dependent of that exerted by other gases present independent
The True or False: Dalton's law is true regardless of the number of different gases that are present True
Dalton’s law may be expressed as PT = P1 + P2 + P3 + . . .
A gas collected by water displacement is not pure but is always mixed with water vapor
Patm = Pgas + PH2O
The barometric pressure and the temperature during the experiment were 731.0 torr and 20.0°C, respectively. What was the partial pressure of the oxygen collected? Patm = 731.0 torr PH2O = 17.5 torr Patm = PO2 + PH2O PO2 = Patm − PH2O PO2 = 731.0 torr − 17.5 torr = 713.5 torr
Created by: tbstinso