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Chem Chap 11
Gases - Section 1
| Question | Answer |
|---|---|
| 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
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