march 10 0nward chem
A sample of gas occupies a volume of 40 L, has a temperature of 280 K and a pressure of 15 kPa. Calculate the number of moles of gas which are present in the sample.
0.26
A sample of O2 occupies 75 L at 1 atm. If the volume of the sample doubles, what is the new pressure of O2? ___ atm
0.5
A sample of helium gas occupies 12.9 L at 315 K and 1.20 atm. This sample contains how many moles of helium? ______ mol He
0.599
A chamber with a fixed volume is shown above. The temperature of the gas inside the chamber before heating is 25.2 °C and its pressure is 0.600 atm. The gas is heated with a flame to a temperature of 72.4 °C, what is its pressure at this temperature? ___ atm
0.695
A sample of oxygen gas occupies 23.4 L at 298 K and 86.5 kPa. This sample contains how many moles of oxygen?
0.817
355 g of chlorine gas (MW = 70.9 g/mol) is held in a vessel with a fixed volume of 70.0 L. What is the pressure of the gas in atmospheres if its temperature is 30.0 °C? _____ atm
1.78
The image above shows a rigid container filled with gas at a temperature of 300 K and a pressure of 10.0 atm. If the temperature increases to 320 K, what is the new pressure of the container? ___ atm
10.7
A sample of gas Y occupies 500 L at the pressure of 80 KPa. After changing the volume of the sample, the pressure of it is 400 KPa. What is the new volume of the gas? ___ L
100
The image above shows a chamber with a fixed volume filled with gas at a pressure of 1560 mmHg and a temperature of 445.0 K. If the temperature drops to 312.0 K, what is the new pressure of the gas in the chamber? ___ mmHg
1090
Assuming nitrogen behaves like an ideal gas, what volume would 14.0 g of nitrogen gas (N2) occupy at STP? The gas constant is 0.0821 .
11.2
A gas sample in a rigid container at 455 K is cooled to 273 K where it has a pressure of 1 atm. What was the original pressure of the gas in mmHg? _____ mmHg
1270
The above shows a balloon full of gas which has a volume of 120.0 mL at 300.0 K. Assuming pressure remains constant, what is the volume of the balloon if the temperature of the gas increases to 320.0 K? ___ mL
128
A balloon is filled with 3.60 L of H2 gas at STP. If the balloon is taken into a sea where the pressure is 2.50 atm and the temperature is 10.00 °C, what is the new volume of H2 gas in liters?
149
175 mL of Cl2 gas is held in a flexible vessel at STP. If the vessel is transported to the bottom of the impact basin Hellas Planitia on the surface of Mars where the pressure is 1.16 kPa and the temperature is -5.0 °C. What is the new volume of Cl2 gas in liters? ___ L
15
A container holds four times as many moles of CO2 as O2. If the total pressure in the container is 20. atm, what is the pressure exerted by carbon dioxide? ___ atm Round your answer to the nearest whole number.
16
A rigid steel tank filled with 62.7 L of nitrogen gas at 85.0 atm and 19°C is heated to 330°C while the volume remains constant. What is the final gas pressure in atmospheres? _____ atm.
176
1.00 mole of an ideal gas occupies a volume of 22.4 L at 0 °C and 760 mmHg (STP). It is cooled to −41°C while the pressure is increased to 805 mmHg. What is the new volume of the gas in liters? _____ L
18
The image shows a piston system where gas is compressed. If the uncompressed system is at a standard pressure of 1 atm, what is the pressure of the compressed piston? ___ atm
2
A rigid container holds 22.4 L of an ideal gas at STP. How many moles of gas need to be added to the container to make the pressure equal to 325 kPa? 1 mol + _____ mol
2.21
80.0 mL of fluorine gas is held in a flexible vessel at STP. If the vessel is transported to the surface of Venus where the pressure is 92.0 atm and the temperature is 460 °C, what is the new volume of the gas in milliliters? ___ mL
2.33
A15.0 L15.0 L tank of gas is contained at a high pressure of 8.20×1048.20×104 torr. The tank is opened and the gas expands into an empty chamber with a volume of 6.00×104 L6.00×104 L. Calculate the new pressure of the gas. _____ torr
20.5
A piston system is shown above. Assuming constant pressure, what is the absolute temperature if the volume decreases to 100 mL?
300 k
Calculate the volume occupied by 32.0 g of O2 gas, the pressure of the O2 gas is 78.5 kPa at 25 °C. ___ L
31.5
At what Celsius temperature does 0.750 mol of an ideal gas occupy a volume of 35.9 L at 114 kPa? ______°C
384
A movable chamber has a volume of 18.5 L (at a temperature of 18.5 °C). Assuming no gas escapes and the pressure remains constant, what is the temperature when the chamber has a volume of 19.8 L? ___ °C
39.o
particles in a sample of matter at 600 K is _____ as the average kinetic energy of the particles in another sample at −73°C.
3x as great
Which phase is represented by the area above the curve ACD?
solid
A phase diagram is a graph which the conditions of temperature and pressure under which a substance exists in the _____.
solid, liquid, gas
What best describes the path of the gas particles in a given sample of gas?
straight path which changes upon collisions with other particles
Ferrocene is purified by -- using gentle heating at atmospheric pressure.
sublimation
The phase change involved in the following particle diagram is:
sublimation
The phase diagram of substance M is shown above. Initially, M is at point A. After a significant decrease in pressure, M is at point C. What phase change has M gone through?
sublimation
The average speed and kinetic energy of the particles in a gas are proportional to the measured
temperature
Which of the following factors affect the average kinetic energy of gases?
temperature of the gas
21.7 mL of gas at 98.8 kPa is allowed to expand at constant temperature into a 52.7 mL container. What is the new pressure of the gas? _____ kPa.
40.6
A sample of gas X occupies 10 m3 at a pressure of 120 kPa. If the volume of the sample is compressed to 3 m3, what is the new pressure of the gas? ___ kPa
400
A sample of Krypton gas occupies 66.7 L at 25.0 °C. Assuming constant pressure, what would the temperature of the gas be in kelvin if the volume increases to 100.0 L?
447
A car tire was inflated to 82.0 kPa in a repair shop where the temperature is 26.0 °C. What is the temperature of the gas in the tire if the pressure in the tire increases to 87.3 kPa when it is taken out of the repair shop? ___ °C
45.3
If two gases, A and B, in separate 1 liter containers exert pressures of 2 atm and 3 atm respectively, what will be the pressure exerted when both gases are put together in a single 1 liter container?
5
How many moles of carbon dioxide gas occupy a volume of 81.3 L at 204 kPa and a temperature of 95.0 °C? ______mol CO2
5.42
The image above shows a balloon filled with gas which has a volume of 100 mL at 300K. Assuming constant pressure, what is the absolute temperature of the gas if the volume of the balloon increases to 200 mL? ___ K
600
You have a balloon filled with hydrogen gas which keeps it at a constant pressure, regardless of its volume. The initial volume of the gas is 736 mL at 15.0 °C. The gas is heated until its volume is 2.28 L, what is its final temperature in degrees celsius? _____ °C
619
One mole of an ideal gas was found to occupy a volume of 20.0 L at a pressure of 930. mmHg and at a temperature of 25 °C. What is the value of the gas constant in ? ___
62.4
The image above shows a gas held in a chamber with a fixed volume. The gas begins with a temperature of 333 K and a pressure of 4.00 atm (green) that increases to 7.65 atm (orange) as the gas is heated. What is the temperature of the gas when the pressure increases to 7.65 atm? ___ K
637
Argon makes up 0.93 % of the atmosphere. In a given sample of air, the partial pressure of argon is 6.54 mmHg. What is the pressure of the sample?
703
217 mL of neon gas at 551 °C is brought to standard temperature (0 °C) while the pressure is held constant. What is the new volume? _____ mL
71.9
Assuming oxygen behaves like an ideal gas, what volume in liters would 3.50 moles of oxygen gas occupy at STP? ___ L
78.5
4.00 moles of an ideal gas was found to occupy a volume of 100. L at a pressure of 99.1 kPa and at a temperature of 25.0 °C. What is the value of the gas constant in L⋅kPamol⋅KL⋅kPamol⋅K ? ___ L⋅kPamol⋅K
8.31
At 25 °C, 1.00 mole of O2 gas was found to occupy a volume of 12.5 L at a pressure of 198 kPa. What is the value of the gas constant in ? ___
8.31
At STP (101.3 kPa, 0 °C), one mole of Ar gas was collected and was found to occupy a volume of 22.4 L. What is the value of the gas constant in rounded to the nearest hundredth? ___
8.31
A balloon contains 0.950 mol of nitrogen gas and has a volume of 25.5 L. How many grams of N2N2 should be released from the balloon to bring the volume to 17.3 L? _____g N2
8.56
On Venus, the atmospheric pressure is 2700 mmHg and nitrogen gas makes up 3.0 % of the atmosphere. What is the partial pressure of nitrogen on Venus? ______ mmHg d
81
A sample of gas has a volume of 100.0 L at 135°C. Assuming the pressure remains constant, what is the volume of the gas if its temperature decreases to 72.0 °C? ___ L
84.6
Hexane is a nonpolar liquid. The vapor pressure of hexane at its normal boiling point is _____.
= 1 ATM
EASYSECOND TRY At which of the following point do the three phases of a substance coexist?
A
A balloon filled with 1.22 L of gas at 286 K is heated until the volume is 2.86 L while the pressure remains constant. What is the temperature of the gas in Kelvin? 670 K
A birthday balloon had a volume of 14.1 L when the gas inside was at a temperature of 13.9 °C. Assuming no gas escapes, what is its volume when the balloon warms up to 22.0 °C? 14.5
The actual volume of molecules of gas is negligible as compared to the total volume of gas since: A large volume is occupied by empty spaces
A large volume is occupied by empty spaces
Which of the following transition is considered the phase change from water to steam?
b>c
The phase diagram of substance M is shown above. Initially, M is at point B. After a significant decrease in temperature, M is at point A. What phase change has M gone through?
freezing
In which of the following states of matter would molecules be moving the most?
gaseous
A gas that completely obeys all of the assumptions of the kinetic-molecular theory is called a(n) _____.
ideal gas
Which type of curve is shown by DC in the given phase diagram?
SUBLIMATION CURVE
A solid substance melts when it is heated up to such a level that the intermolecular forces balance the molecular motion.
TRUE
In a phase diagram of water, the melting point of ice decreases as the pressure increases.
TRUE
In the below mentioned phase diagram of water, the curve OC shows the effect of pressure on the melting point of ice.
TRUE
In the phase diagram shown here: , the line OC is almost vertical because the melting point of a solid is not very sensitive to changes.
TRUE
Solids are the only state of matter that is not a fluid.
TRUE
The vibrational forces overcome the attractive forces holding the particles of the solid together while a material melts.
TRUE
Calculate the pressure exerted by 66.0 g of CO2 gas at -14.5 °C that occupies a volume of 50.0 L. ______ atm
.636
A sample of krypton gas in a container of volume 1.90 L exerts a pressure of 0.553 atm at 21°C. How many moles of gas are present? _________ mol Kr
0.0436
A balloon tied to the ground with a rope floats in the air. The volume of the balloon is 1 L and the pressure in the balloon is 0.8 atm. If the balloon is placed deep underwater where it compresses so the pressure in the balloon is 4 atm, what will be the new volume of the balloon? ___ L
0.2
If the gas in the above system has a volume of V at a pressure of P, what is the volume of the same gas at a pressure of 4P? ___ V
0.25
The unheated gas in the above system has a volume of 20.0 L at a temperature of 25.0 °C and a pressure of 1.00 atm. The gas is heated to a temperature of 100.0 °C while the volume remains constant. What is the pressure of the heated gas? Ignore the block labeled "A". ___ atm
1.25
If 0.0714 moles of N2 gas occupy 1.25 L of space, how many moles of N2 gas have a volume of 25.0 L? Assume temperature and pressure remain constant. ___ moles
1.43
A 5.00 L sample of helium expands to 12.0 L at which point the pressure is measured to be 0.720 atm. What was the original pressure of the gas? _____atm
1.73
Substance C is in the:
GAS PHASE
If the uncompressed gas in the above system has a volume of 300.0 mL at a pressure of 20.0 kPa, what is the volume of the gas when it is compressed to a pressure of 25.0 kPa? ___ mL
240
A sample of nitrogen gas is at a temperature of 50.0 °C and a pressure of 2.00 atm. If the volume of the sample remains constant and the pressure increases to 3.20 atm, what is the new temperature of the nitrogen gas? ______°C
244
The gas pressure in an oxygen tank is 3.90 atm at a temperature of 298 K. If the pressure decreases to 3.20 atm, what is the temperature of the gas in kelvin? ___ K
245
If the gas in the piston above has a volume of 20.0 L at a temperature of 25 °C, what is the volume of that gas when it is heated to 100 °C if the pressure remains constant? ___ L
25
What would be the approximate volume of the air in a typical scuba tank if the pressure were 1 atm?
2500 l
A container with a fixed volume, filled with hydrogen gas at −104°C and 71.8 kPa is heated until the pressure reaches 225.9 kPa. What is the temperature of the hydrogen gas in degrees Celsius? _____ °C
258
A flask holds five times as many moles of N2 as O2. If the total pressure in the jar is 18 atm, what is the pressure exerted by oxygen? ___ atm d
3
The -- point is the highest temperature at which the substance can possibly exist as a liquid.
CRITICAL
The critical pressure is the pressure that must be applied to the gas at the _____ in order to turn it into a liquid.
CRITICAL TEMP
The highest temperature at which a substance can exist in the liquid phase is called its _____.
CRITICAL TEMP
At high temperature and low pressure, liquid water is the stable phase.
FALSE
Generally, the values for the melting point of a solid and the freezing point of its liquid form are different.
FALSE
In the phase diagram of water, at high pressure, the solid and liquid boundary shows a positive slope.
FALSE
The critical temperature is the lowest temperature at which the substance can possibly exist as a liquid.
FALSE
The strength of the metallic bond does not depend on the packing arrangement of the metal atoms.
FALSE
At high temperature and low pressure, liquid water is the stable phase.
FASLE
When a liquid is heated, the average energy of its particles
KINETIC
According to the kinetic molecular theory of gas:
Molecules are in a state of ceaseless and random motion in all directions
The -- forces overcome the -- forces holding the particles of the solid together while a material melts.
VIBRATIONAL, ATTRACTIVE
Which of the following correctly describes the characteristics of a triple point?
Where three phases of a substance coexist
Which of the labeled points represent the triple point of the phase diagram below?
a
Which of the following statements regarding gas temperature and kinetic energy is/are correct?
all of the above
What quantity is held constant in a combined gas law problem?
amount
Which curve represent the phase boundary of equilibrium between solid and liquid?
curve ca
What is the change of state from gas to solid called?
deposition
Collisions between gas particles and between particles and the container walls are -- collisions
elastic
As the temperature increases, the rate of _____ increases.
evaporation
Consider two 100 mL samples of water, one at 40°C and one at 80°C.None of the water molecules in the 40°C sample have a higher kinetic energy than any of the molecules in the 80°C sample.
false
HARD Consider two 100 mL samples of water, one at 40°C and one at 80°C.The average kinetic energy of the molecules in the 80°C sample is twice as great as the average kinetic energy of the molecules in the 40°C sample.
false
Temperature, according to the kinetic molecular theory, is a measure of intermolecular attraction.
false
The absolute temperature of a gas is a measure of the strength of the intermolecular forces of attraction of that gas.
false
The total pressure of gas molecules is equal to the product of the partial pressure of individual components.
false
True or False: H2O2 decomposes into hydrogen and oxygen as described in the following reaction: H2O2 (l) → H2 (g) + O2 (g) If a sample of the products is collected and the total pressure is 12.4 atm, the partial pressure of oxygen gas is 12.4 atm.
false
True or False: The heavier the gas is, the faster its diffusion is.
false
Vapor pressure is independent of the temperature of the liquid, so raising the temperature does not affect the rate of evaporation.
false
If the temperature of a substance increases, will the particles of that substance be moving faster or slower or at the same speed as they were before the temperature changed?
faster
What scale is used to measure absolute temperature?
kelvin
When a substance is heated the:
kinetic energy increases
Complete the sentence using total, partial or complete. The pressure that one particular gas exerts when it is part of a mixture of gases is called the ______ pressure of that gas.
partial
Which mathematical combination of pressure, temperature, and volume is constant for an ideal gas?
pv/t
When the absolute temperature of gas molecules is increased 4 times, the average kinetic energy:
quadruples
What best describes the kinetic energy of two gas particles before and after a collision?
the total kenetic energy of the particles stays the same
What is the relationship between the temperature of a gas sample and the kinetic energy of the particles of the gas?
theyre directly related
Which of the following correctly describes the A point of the phase diagram?
triple point
Average kinetic energy is directly related to temperature on the Kelvin scale.
true
Gases are in constant rapid motion with random collisions.
true
Increasing the pressure in the cylinder by adding a gas not involved in the reaction will increase the total gas pressure in the cylinder.
true
Which of the following remains constant in Gay-Lussac's law?
volume
The ideal A gas at X °C The ideal B gas at Y °C The ideal C gas at Z °C If the kinetic energies of the three gases is expressed as: KEA > KEB > KEC, which of the following is the correct relationship of temperatures X, Y, and Z?
x>Y>z
