Gases Chem 20

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16 Terms

1
Pressure
Measurement of force per unit area.
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2
Atmospheric pressure
The force per unit area exerted by air on all objects, standard value is 101.325 kPa at sea level.
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3
Standard Temperature and Pressure (STP)
Defined as 1 atmosphere at 0 °C, or 101.325 kPa at 273.15K.
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4
Boyle’s Law
States that as the pressure on a gas increases, the volume decreases proportionally, provided temperature and amount of gas remain constant.
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5
Charles’ Law
States that as the temperature of a gas increases, the volume increases proportionally, provided pressure and amount of gas remain constant.
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6
Absolute Zero
The lowest possible temperature where all molecular motion stops.
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7
Gas exerts pressure
Gases exert pressure on the walls of their container.
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8
The Combined Gas Law
States that the product of pressure and volume of a gas sample is proportional to its absolute temperature in Kelvin (PV = kT).
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9
Molar Volume
The volume that one mole of a gas occupies at a specific temperature and pressure.
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10
Gay-Lussac’s Law of Combining Volumes
When measured at the same temperature and pressure, volumes of gaseous reactants and products of chemical reactions are in simple ratios of whole numbers.
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11
Avogadro’s Theory
Equal volumes of gases at the same temperature and pressure contain equal numbers of molecules.
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12
Ideal Gas Law
An equation of state for an ideal gas, stated as PV = nRT.
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13
Universal Gas Constant (R)
A constant used in the Ideal Gas Law, typically equal to 8.314 kPa L/mol K.
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14
Standard Ambient Temperature and Pressure (SATP)
Defined as 100 kPa at 25 °C or 100 kPa at 298.15K.
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15
Translational motion
The most important form of motion in gases.
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16
Partial pressure
The pressure exerted by an individual gas in a mixture.
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