Question 1

Whipped cream in a can contains whipped cream and carbon dioxide.

Accepted Answer

Whipped cream in a can typically contains nitrous oxide, not carbon dioxide, as the propellant to help dispense the cream and create the whipped texture.

Question 2

Why are canisters of spray paint and hairspray labeled, "Keep away from heat sources"?

Accepted Answer

The answer of Why are canisters of spray paint and...

Question 3

A properly designed Torricelli mercury barometer should be at least

Accepted Answer

A Torricelli mercury barometer should be at least 800 mm tall to measure atmospheric pressure accurately, as standard atmospheric pressure can support a mercury column of about 760 mm (or 76 cm) in height.

Question 4

Mountain climbers often need to take tanks of oxygen with them as they approach higher altitudes. Explain why this oxygen is needed by the climbers.

Accepted Answer

The answer of Mountain climbers often need to take tanks...

Question 5

In many science fiction movies, characters that are suddenly pulled into outer space experience phenomena such as their heads exploding or their eyes bulging. Provide a reasonable explanation based on the properties of gases for why movies speculate that this could happen, even though it is exaggerated?

Accepted Answer

The answer of In many science fiction movies, characters that...

Question 6

An open-end manometer constructed from a U-shaped tube was operated using an oil that has a density of 1.088 g mL⁻¹. In a particular measurement, the level in the end connected to the gas vessel, on which the experiment was being conducted, measured 76.2 cm above the U-neck, while the level in the open end was 23.8 cm above the U-neck. The outside air pressure in the laboratory was measured as 754 torr. What is the pressure in the gas vessel?Hint: The density of mercury is 13.533 g mL⁻¹^{at room temperature.}

Accepted Answer

The answer of An open-end manometer constructed from a U-shaped...

Question 7

An open-end manometer constructed from a U-shaped tube was operated using an oil that has a density of 1.164 g mL⁻¹. In a particular measurement, the level in the end connected to the gas vessel, on which the experiment was being conducted, measured 82.8 cm above the U-neck, while the level in the open end was 17.2 cm above the U-neck. The outside air pressure in the laboratory was measured as 764 torr. What is the pressure in the gas vessel?Hint: The density of mercury is 13.533 g mL⁻¹^{at room temperature.}

Accepted Answer

The answer of An open-end manometer constructed from a U-shaped...

Question 8

A closed-end manometer that utilizes an oil having a density of 0.820 g ml⁻¹ is being used to measure gas pressure in a vessel designed for studies on the gaseous state. In a particular experiment, the oil in the closed end of this manometer was 62.2 cm above the U-neck, while the level in the end connected to the vessel was measured as 25.2 cm above the U-neck. What is the pressure, in atmospheres, of the gas?Hint: The density of mercury is 13.533 g mL⁻¹^{at room temperature.}

Accepted Answer

The answer of A closed-end manometer that utilizes an oil...

Question 9

A gas mixture is 50.00% helium and 50.00% methane, by volume. What is the percent, by weight, of methane in the mixture?

Accepted Answer

The answer of A gas mixture is 50.00% helium and...

Question 10

A gaseous mixture is 20.00% argon, 25.00% nitrogen, 30.00% methane and 25.00% ethylene, C₂H₄ by weight. Calculate the percent, by volume, of methane in the mixture.Hint: Consider the difference between mass and moles.

Accepted Answer

The answer of A gaseous mixture is 20.00% argon, 25.00%...

Question 11

People who live on the second floor of apartment buildings often save money on their home-heating costs. Based on the properties of gases, provide an explanation for this.

Accepted Answer

The answer of People who live on the second floor...

Question 12

A general chemistry student needs to heat a liquid. Not wanting to spill anything, he puts a stopper on the solution flask and then heats the solution to 220°C. While working in another part of the lab, the student hears an explosion and rushes over to find his flask broken into dozens of pieces. What was the likely cause of the explosion?

Accepted Answer

The answer of A general chemistry student needs to heat...

Question 13

Why do a person's ears "pop"when changing altitude in an airplane?

Accepted Answer

The answer of Why do a person's ears "pop"when changing...

Question 14

Five moles of oxygen gas are heated from 25°C to 100°C in a constant volume container. At this new temperature, the density of the oxygen gas will be ________ that at the initial temperature.

Accepted Answer

The answer of Five moles of oxygen gas are heated...

Question 15

Calculate the volume of hydrogen gas at 0°C and 2.00 atm that will be formed when 245 mL of 0.735 M HCl solution reacts with excess Mg to give hydrogen gas and aqueous magnesium chloride.

Accepted Answer

The answer of Calculate the volume of hydrogen gas at...

Question 16

In a gas mixture containing oxygen, neon, and argon, the mole fractions are:  If this mixture behaves as an ideal gas, what is the density of this mixture, in g/liter, at 37.0 °C and 765 torr? If someone gave a sample of the mix described above to a student and had them determine the molar mass of the "gas"without telling the student it was a mixture, what value should the student report?

Accepted Answer

The answer of In a gas mixture containing oxygen, neon,...

Question 17

A piece of zinc is allowed to react with an excess quantity of sulfuric acid and the hydrogen gas produced is collected in a gas buret by displacement of water. Neglecting the effect of the vapor pressure of water on the system, calculate how many mg of zinc would generate 92.0 mL of the gas at a temperature of 25.0 ^°C and a pressure of 1.00 atm. ________Hint: Find the moles of gas first.

Accepted Answer

The answer of A piece of zinc is allowed to...

Question 18

Individuals are often advised to put out flames if they "smell gas."In reality, people smell dimethyl sulfide ((CH₃)₂S)that is added to natural gas to give it a detectable odor; natural gas by itself is odorless. What chemical characteristic of methyl sulfide makes it better to use as a gas indicator compared with the more pleasant-smelling isoamyl acetate (C₇H₁₄O₂), also known as oil of banana?

Accepted Answer

The answer of Individuals are often advised to put out...

Question 19

During a chemical demonstration, a filled balloon is submerged in liquid nitrogen, an extremely cold material. As the balloon sits in the liquid nitrogen, it appears to deflate. However, when the balloon is removed from the nitrogen, it appears to fill again. What is happening to the gas inside the balloon that gives this visual result?

Accepted Answer

The answer of During a chemical demonstration, a filled balloon...

Question 20

Water vapor is a polar gas molecule. Because of this, it has fairly strong interactions with itself in the gas phase that can make it behave less like an ideal gas that other gases under similar conditions. What is the difference between the calculated pressures found using the ideal gas law and those found using the van der Waals gas equation for 1 mole of water vapor at −100°C in a 1.00 L container?(van der Waals constants for water are a = 5.464 L² atm mol⁻², b = 0.03049 L mol⁻¹)

Accepted Answer

The answer of Water vapor is a polar gas molecule....

Quiz 11: Properties of Gases