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    which of the following statements best explains why a closed balloon filled with helium gas rises in air?

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    At room temperature, the average speed of helium is higher than that of oxygen by a factor of :

    Click here👆to get an answer to your question ✍️ Which of the following statements best explains why a closed balloon filled with helium gas rises in air? (1) Helium is an monatomic gas, whereas nearly all the molecules that make up air, such as nitrogen andoxygen, are diatomic. (2) The average speed of helium atoms is higher than the average speeds of air molecules, and the higher speed of collisions with the balloon walls propels the balloon upward. (3) Because the helium atoms are of lower mass than the average air molecules, the helium gas is less dense than air. The balloon thus weighs less than the air displaced by its volume. (4) Because helium has a lower molar mass than the average air molecule, the helium atoms are in faster motion. This means that the temperature ofthe helium is higher than the air temperature. Hot gases tend to rise.

    Question

    Which of the following statements best explains why a closed balloon filled with helium gas rises in air? (1) Helium is an monatomic gas, whereas nearly all the molecules that make up air, such as nitrogen andoxygen, are diatomic. (2) The average speed of helium atoms is higher than the average speeds of air molecules, and the higher speed of collisions with the balloon walls propels the balloon upward. (3) Because the helium atoms are of lower mass than the average air molecules, the helium gas is less dense than air. The balloon thus weighs less than the air displaced by its volume. (4) Because helium has a lower molar mass than the average air molecule, the helium atoms are in faster motion. This means that the temperature ofthe helium is higher than the air temperature. Hot gases tend to rise.

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    Which of the following statements best explains why a closed balloon filled with He gas rises in air?

    Which of the following statements best explains why a closed balloon filled with He gas rises in air ... the air temperature, hot gases tend to rise.

    Which of the following statements best explains why a closed balloon filled with He gas rises in air?

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    Chapter 10 Practice Flashcards

    Start studying Chapter 10 Practice. Learn vocabulary, terms, and more with flashcards, games, and other study tools.

    Chapter 10 Practice

    Suppose you have a fixed amount of an ideal gas at a constant volume. If the pressure of the gas is doubled while the volume is held constant, what happens to its temperature?

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    it doubles

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    You have a gas at 25 C confined to a cylinder with a movable piston. Which of the following actions would double the gas pressure?

    a. Lifting up on the piston to double the volume while keeping the temperature constant

    b. Heating the gas so that its temperature rises from 25 to 50 C. while keeping the volume constant.

    c. Pushing down on the piston to halve the volume while keeping the temperature constant

    Click card to see definition 👆

    c

    b would increase pressure but not double it

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    1/17 Created by kellishiversTEACHER

    Terms in this set (17)

    Suppose you have a fixed amount of an ideal gas at a constant volume. If the pressure of the gas is doubled while the volume is held constant, what happens to its temperature?

    it doubles

    You have a gas at 25 C confined to a cylinder with a movable piston. Which of the following actions would double the gas pressure?

    a. Lifting up on the piston to double the volume while keeping the temperature constant

    b. Heating the gas so that its temperature rises from 25 to 50 C. while keeping the volume constant.

    c. Pushing down on the piston to halve the volume while keeping the temperature constant

    c

    b would increase pressure but not double it

    Amonton's Law P1/T1=P2/T2

    Amonton's Law expresses the relationship between pressure and temperature.

    a. Use Charles' law and Boyle's law to derive the proportionality relationship between P and T

    b. If a car tire is filled to a pressure of 32.0 Ib/in^2 (psi) measured at 75 F, what will be the tire pressure if the tires heat up to 120 F during driving

    Temperature and Pressure are directly proportional. If one increases the other increases

    P1/TI = P2/T2 B. 34.69 psi

    Which of the following statements best explains why a closed balloon filled with helium gas rises in the air?

    a. Helium is a monoatomic gas, whereas nearly all the molecules that make up air, such as nitrogen and oxygen are diatomic

    b. The average speed of helium is greater than the average speed of air molecules, and the greater speed of collisions with the balloon walls propels the balloon upward.

    c. Because the helium atoms are of lower mass than the average air molecule, the helium gas is less dense than air. The mass of the balloon is thus less than the mass of the air displaced by its volume

    d. Because the helium has a lower molar mass than the average air molecule, the helium atoms are in faster motion. This means that the temperature of the helium is greater than the air temperature. Hot gases tend to rise.

    c

    Suppose you are given two 1L flasks and told that one contains a gas of molar mass 30, the other gas of molar mass 60, both at the same temperature. The pressure in flask A is x atm, and the mass of gas in that flask in 1.2g. The pressure in flask B is 0.5x atm, and the mass of gas in that flask is 1.2g. Which flask contains the gas of molar mass 30, and which contains the gas of molar mass 60?

    A 30 b 60

    A 35.1 g sample of solid CO2 (dry ice) is added to a container at a temperature of 100K with a volume of 4.0L. If the container is evacuated (all gas removed), sealed and then allowed to warm to room temperature so that all of the solid CO2 is converted to a gas, what is the pressure inside the container? (T= 298K)

    4.89 atm

    Arsenic (III) sulfide sublimes readily, even below its melting point of 320 C. The molecules of the vapor phase are found to effuse through tiny holes at 0.28 times the rate of effusion of Ar atoms under the same conditions of temperature and pressure. What is the molecular formula of arsenic (III) sulfide in the gas phase?

    A4S6

    Which one or more of the following statements are true?

    a. O2 will effuse faster than Cl2

    b. Effusion and diffusion are different names for the same process

    c. Perfumes travel to your nose by the process of effusion

    d. The higher the density of a gas, the shorter the mean free path

    a,d true

    high density = MORE collisions

    a. Place the following gases in order of increasing average molecular speed at 25 C: Ne, HBr, SO2, NF3, CO

    b. Calculate the rms speed of NF3 molecules at 25C

    c. Calculate the most probable speed of an ozone molecule in the stratosphere, where the temperature is 270 K

    HBr, NF3, SO2, CO, Ne

    323.63 m/s 305.83 m/s

    remember molar mass in kg

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