Relationships
What is the relationship between pressure and volume.
Inverse. (if temp. stays the same... as pressure increases volume decreases)
You wake up on the first actual cold day of winter due to a cold front, and decide to wear a new coat to school. When you get to your car, what do you notice about your tire pressure?
Your tire pressure has dropped.
293 K -> ____ C
20 degrees C
A balloon has a volume of 6.7 L at a temperature of 30°C. If the temperature is lowered to 17°C, what is the new volume? (3 sig figs)
6.41 L
What is the relationship between number of moles and pressure.
Which two variables produce a positive linear curve when placed on a graph?
Pressure & Temp.
Volume & Temp.
You shake a can of soda before opening it, increasing its pressure. When you open the can, what happens to the volume of carbon dioxide inside the can.
The volume of CO2 increases.
293 C -> ____ K
566 K
A helium-filled balloon has a volume of 42.0 L at 37ºC and 2.58 atm. What volume will it have at 1.86 atm and 11.0ºC? (3 sig figs and correct units)
53.4 L
Tungsten is a metal used in light bulb filaments. It is produced industrially by the following reaction.
WO3 + 3 H2 (g) → W (s) + 3 H2O (l)
How many liters of hydrogen gas at 45ºC and 2.18 atm are needed to react completely with 567 grams of tungsten oxide? (3 sig figs and correct units)
87.9 L H2 is needed.
Which two variables produce a negative exponential curve? (exponential decay curve)
Pressure & Volume
The pressure decreases as a scuba diver ascends to the surface of the water. What happens to the volume of air in his lungs?
Increases.
Convert 6767 mmHg to psi
131 psi
21.0 L of a gas is under 4.2 atm of pressure. What is the new pressure, in psi, if the gas is compressed to a volume of 6.70 L? (3 sig figs and correct units)
194 psi
A tank of gas contains a hydrocarbon in the form of a gas. A sample of gas has a mass of 50.375 grams and occupies a volume of 18.46 L at 103 C and 5.25 atm. What hydrocarbon could it be? (Hydrocarbon: CxHy)
3.14 mols at 50.375 g means that the gas is probably: CH4
What is the relationship between volume and moles?
Direct. (if there are more moles, there is more volume.)
You decide to go to Austin this weekend and you and some friends drive your car to get there. It takes you about an hour to get there. When you get to your destination, what do you notice about your tire pressure?
Your tire pressure has increased
Convert 420.6769 mL to liters and put into scientific notation AND have the answer rounded to 3 sig figs.
4.21 x 10^-1 L
How many grams of oxygen gas are in a balloon that has a volume of 3.78 L in a room with a temperature of 28.0°C and a pressure of 4.03 atm? (3 sig figs and correct units)
19.7 g of O2
!!!DAILY DOUBLE!!!
(you may wager your points or up to 500 pts whichever is higher)
How many grams of Fe2(CO3)3 must decompose in order to produce 3.25 L of CO2 at 50.0°C and 1.36 atm?
162 g of Fe2(CO3)3
How many positive linear graphs can we make using two of these variables: P, V, n, T,
4: P vs n, P vs T, V vs n, V vs T.
You leave a can of coke in your car on a very hot summer day. What happens to the can of coke, and why?
The can of coke explodes because of the pressure inside of the can building due to the temperature increase.
7299 kPa
When 3 moles of CO2, 2 moles of O2, and 6 moles of N2 are combined in a closed container, the resulting pressure is 4.75 atm. What is the partial pressure of each gas? (3 sig figs and correct units)
CO2 = 1.30 atm
O2 = 0.864 atm
N2 = 2.59 atm
!!!TEAM QUESTION!!!
What is the density of a sample of oxygen gas, O2, if the pressure is 4 atm and the temperature is 17.0 C? (3 sig figs and correct units)
3260 g/L