Connect Assignment: Chapter 9 The Gaseous State

why does gas density change with temperature

higher temperature causes gas particles to move more rapidly, causing them to spread further apart

if 1 mole of each of these three ideal gases is present at a temperature of 0ºC and a pressure of 1 atm, which will occupy the most volume

they occupy equal volumes

at what temperature will a gas have the highest density, given the same pressure and number of gas particles

-15ºC

a sample of SF6 gas in an expandable container occupies 1.75 L at 0.950 atm and 37.0ºC. if the temperature is increased to 65.0ºC and the volume decreases to 1.18 L, what pressure will the SF6 exert

1.54 atm

an inflatable ball has a volume of 10.0 mL at a temperature of 10.0ºC. if the temperature is raised to 30.0ºC at constant pressure, what is the new volume of the ball

10.7 mL

a sealed syringe contains 15.0 mL of N2 at atmospheric pressure (760 torr) if the pressure is increased to 985 torr, what is the new volume of the syringe

11.6 mL

express a pressure of 147.0 kPa in mm Hg 1 atm = 101.325 kPa 1 atm = 760 mm Hg

1103 mm Hg

determine the molar volume of Ar gas at -20.0ºC and 1.35 atm (standard molar volume = 22.414 L/mol)

15.4 L

ammonia can be produced according to the following reaction. according to Gay-Lussac's law of combining volumes, how many volumes of H2 would react with each volume of N2 N2(g) + 3H2(g) -> 2NH3(g)

3 volumes

select all of the following that are true regarding the relationship between pressure and volume at constant temperature

- decreasing the volume a gas occupies will increase the pressure it exerts - as volume decreases, gas particles in a smaller space strike the walls more frequently, increasing the pressure

select all statements that accurately describe diffusion and effusion

- effusion requires gas particles to pass through a small opening - diffusion is the movement of gas particles into regions of lower concentration

select all of the following that are postulates of kinetic-molecular theory

- gas particles are small and very spread out - gas particles move rapidly and in straight lines, except when colliding

select all of the statements that are true concerning gases

- gases are less dense than liquids and solids - gas particles are not strongly attracted to each other - gases expand to fill their containers

select all units that are commonly used to represent pressures

- mm Hg - lb/in^2 - atm

select all the properties that are commonly used to describe gases

- temperature - pressure - number of particles

which of these conditions refer to STP

- T = 0ºC - P = 1 atm

select all of the following that are true about the combined gas law

- V and T are directly related - P and T are directly related

a balloon is inflated to a volume of 1.3 L and is found to contain 0.14 mol of a gas. if another balloon is inflated to 7.2 L at the same pressure and temperature, how many moles of gas are present in the second balloon

0.775 mol

rank the following from highest to lowest pressure, with the highest at the top

1. 20 lb exerted over 10 in^2 2. 15 lb exerted over 10 in^2 3. 15 lb exerted over 20 in^2 4. 70 lb exerted over 100 in^2

arrange these gases in order of increasing velocity at a given temperature. the fastest gas should be at the top of the list

1. NH3 2. O2 3. Ar 4. SF6

what volume do 2.70 moles of Ne gas occupy at STP conditions (standard molar volume = 22.414 L/mol)

60.5 L

this graph shows the relationship between temperature and volume for an ideal gas. if a gas begins at point C on the graph and its absolute temperature is decreased by a factor of 4 at constant pressure, which point shows the new temperature and volume of the gas

B

which of these gases would have the highest average kinetic energy

NO2 at 33ºc

according to Avogadro's hypothesis, which of the following is true at constant pressure and temperature

doubling the number of gas particles present will double the volume the gas occupies

based on these graphs of pressure vs volume, predict what will happen to the pressure of an ideal gas if its volume is doubles

the pressure will decrease to half

which of the following is true about how Charles's law relates the temperature and volume of an ideal gas

the relationship is true only at constant pressure