Gases Definition and 501 Threads

My textbook says that the forces of intermolecular attraction between gas molecules are very weak due to large intermolecular spaces between them , that's why they're negligible , Does this have a relation with "force is inversely proportional to the square of distance " (again , I don't know...

Question: In the following link I'm concerned with only pages 1 and 2. I'm wondering if there is a typo or an error of some kind. I feel like there is some inconsistency to what the author refers to as \upsilon, \theta, and \phi. The only angle shown in the diagram is \upsilon, which is the...

How does decreasing the volume increase the temperature of the gases? I was doing an experiment today and when i decreased the volume of the gas from 65ml at 1atm to 20ml the temperature detected an increase of 0.5°C. However, in Boyle's Law temperature is a constant. So would this mean...

When I place a bottle of gas underwater where the pressure is higher, the force exerted on the outside surface of the bottle increases. So the gas inside would have to exert an greater force than before to equalize that external force. So would that process of decreasing volume to jncrease the...

What does it mean by 21% oxygen and 79% nitrogen by volume? Because won't the oxygen and nitrogen have the same volume which is the volume of the whole container? nTRT/VT=nO2RT/VT+nN2RT/VT so why would we say oxygen is 21% by volume since the volume of the oxygen and nitrogen is the same...

I have been given a report and a part of it is on greenhouse gases. What do you think are some scientific factors/properties I should use in a comparison matrix of n2o,co2,ch4. I have read something about the shape of the molecule of an atom affecting the IR rays it can absorb. Also please...

(Please excuse me if this is not the right forum for this question) I have been setting up some old regulators for use with welding gases and need a simple way of converting flow from one gas to another since I often find myself trying to measure flow of one gas with a flowmeter calibrated...

Attached is the question and my working, my answers don't match up to the given answers, but they still seem right. Can anybody see where the mistake is?

Are all collisions between fluid molecules perfectly elastic? I was under the impression that they were not, but now I'm not sure if I'm wrong or not...

Homework Statement A cylinder of cross-sectional area A is divided into two chambers 1 and 2, by means of a frictionless piston. The piston as well as the walls of the chambers are heat-insulating, and the chambers initially have equal length L. Both chambers are filled with 1 mol of helium...

At a local county fair, you watch as blacksmith drops a 0.050-kg iron horseshoe into a bucket containing 25.0 kg of water. If the initial temperature of the horseshoe is 450°C, and the initial temperature of the water is 23°C, what is the equilibrium temperature of the system? Here is...

Hi there, This could be absolute nonsense but I just got thinking about this. Say you had a certain metal into which a quantity of hydrogen had diffused, and then you placed it in communication with another hydrogen-free metal (say, titanium), would it be possible that the hydrogen would move...

I am trying to find a description of sound waves and speed of sound in gases using Kinetic Theory. I mean to derive the sound waves in a medium like gas , composed of molecules moving and colliding as Kinetic Theory describes. The origin of the sound wave, as our experience shows, is the...

Hey, I'm not sure if this should be in the chemistry or physics section,. Hopefully it is in the right place. I have a question about molecular collisions: specifically, what actually happens when two molecules "collide". Perhaps a better question is: "what constitutes a molecular collision?"...

I'm just starting to learn thermodynamics. I was just wondering that in case of a mixture of two gases, if we assume that each gas behaves as a ideal gas, does it imply that the mixture will also behave as an ideal gas? Or do we have to state it separately while making assumptions in our problem?

Homework Statement A moster of a gas has 4 moles and first is in the temperature 300 K and pressure 10 atmosphere.After a change of state, ∆T= -50 K and ∆V=10 liter.Find the final temperature ,volume and pressure of the gas. Homework Equations P*v=n*R*T The Attempt at a Solution...

Which of the following statements accounts for the observation that, at 300 K and 10 atm, the molar volume of C2H6(g) is less than that of H2(g)? A C2H6 molecules are smaller than H2 molecules. B The average kinetic energy of H2 molecules is greater than that of C2H6 molecules. C The average...

I am trying to get a better idea of how Dalton came up with his values of atomic weights for various elements. I know that he used ratios of gas mixtures and I've read about CO, CO2 and CuCO3 (with the a 3 to 4 ratio of C to O). I would like to see many of his specific examples using his...

Homework Statement A horizontal cilindre with a piston of mass M = 0.5 kg is filled with air (the specific heat of air is Cp = 1000 Joule/Grad*kmole). The heating of the gas results in the piston's accelerated displacement (with constant acceleration) until the velocity v = 1 m/s. Determine...

1. Reacting 50 mL of H2(g) with 50 mL of C2H4(g) produces 50 mL of C2H6(g) at 1.5 atm. If the reaction produces 3.1 x 10^2 J of heat and the decrease in volume requires the surroundings do 7.6 J of work on the gases, what is the change in internal energy of the gases? 2. Change in...

I'm wondering why the gases don't stick to the ground like liquids and solids do. I read that gravity is pulling on the molecules but because of the electrons, the molecules repel each other. There's also something called "Brownian motion", what's that? And if they repel each other, why don't...

Hello, I am reading through my textbook and cannot wrap this idea around my head yet Basically, when a molecule hits the wall of the container, it is reflected back. ΔP = -mv_x -mv_x = -2mv_x = FΔt_collision Then they say the collision occurs every 2d/v_x because that's the time it...

Homework Statement Two different ideal gases are separated by a sliding barrier that can move vertically. The gas in the upper chamber 1 has n moles of material, whilst the gas in the lower chamber 2 has 3n moles of material. At T0 the weight of the barrier is such that the volumes of the two...

Homework Statement A cylinder contains 0.2mol of Helium at 30 degrees C and is heated different ways. How much heat is needed to raise the temperature to 70C while keeping thevolume constant? Homework Equations dQ=dU+dT nCpdT=nCvdT+nRdT The Attempt at a Solution What I am...

I'm having trouble understanding what happens to the internal energy of an ideal gas being compressed adiabatically. If DU = DQ + DW, then as we do work PdV compressing the gas, since in adiabatic processes DQ=0, W the change in internal energy is non-zero, so U must increase. But if...

Hello, why gases like Oxygen, Hydrogen, etc are biatomic ? do they exist in monoatomic form ? thanks

First disclaimer: Xenon trioxide, while not existing naturally, can be created artificially. This question is not like "When did you stop beating your wife?" type. So...I read this compound is explosive. Well, a coke and mentos is also explosive. TNT is too. And then, I wanted to know is...

1. Homework Statement A balloon behaves such that the pressure is P = CV3 where C = 100 kPa/m3 . The balloon is blown up with air from a starting volume of 1 m3 to a volume of 3 m3 . Find the work done by the air. 2. Homework Equations W=PdV 3. The Attempt at a Solution...

Homework Statement A balloon behaves such that the pressure is P = CV3 where C = 100 kPa/m3 . The balloon is blown up with air from a starting volume of 1 m3 to a volume of 3 m3 . Find the work done by the air. Homework Equations W=PdV The Attempt at a Solution What I...

Why did Mendelev order the elements according to their atomic masses rather than their atomic number? Why did Mendelev not include noble gases in his periodic table?

If pressure exerted by gases is same in all directions, Why does we have low pressures in higher altitudes and high pressures below.

While trying to deduce the answer to a physics-related (and safety-related) question, I ran across an apparent paradox. I am trying to figure out how quickly the hot gases rising off of a fire cool down. From what I had heard from atmospheric science: 1. Air is a lousy conductor of heat. 2...

I apologize for the "coarse" question, but as a budding chemist, I want to know. Obviously some foods make people/animals fart more when those foods are consumed. What are the catabolic pathways which produce these waste gases? Do we know what the breakdown mechanisms are? My preliminary...

Suppose we have two separate containers of helium gas in thermal equilibrium and completely isolated from the rest of the universe. Let's assume the containers are ideal in the sense that they are completely tranparent to all electromagnetic radiation. Since helium is monatomic, the only...

If you have a flowing gas stream, with multiple species, how many different techniques are there to separate species or particulates? I know you can: -use centrifugation or similar techniques to separate based upon density -use a molecular sieve to separate based upon particle size...

Homework Statement The expanding gases that leave the muzzle of a rifle also contribute to the recoil. A .30 caliber bullet has mass 0.0072kg and a speed 0f 601 m/s relative to the muzzle when fired from a rifle that has mass 2.8 kg. The loosely held rifle recoils at a speed of 1.85 m/s...

Homework Statement A horizontal container with adiabatic walls has a vertical wall inside it which divides the container in two. The wall is free to move back and forth and is not adiabatic. Initially, 1 kg of air is in the compartment to the left of the wall, at 5 bar and 350 K, and to the...

Guys I'm weak in heat and kinetic theory, so I'm going to need extra guide and pointers from you guys to solve this and the coming questions. Thank you. A constant-volume gas thermometer of volume 0.001m3 contains 0.05mol of a gas and is used to deduce values of temperature on the assumption...

Hopefully one of you guys can help me out.. I'm designing a burner that will run off powdered biofuel and I'm trying to calculate the resulting temperature after combustion. I have a higher heating value (HHV) of around 10,000 BTU/lb for the biofuel and for a complete stoichiometric...

A partnership of companies known as Plasmerg and Intelligentry have been making some, in my opinion, crazy claims they refer to as a Plasmic Transition Process. Nevertheless my curiosity keeps me honed in on their progress reports. They claim they use a mixture of five noble gasses [ie...

Hi I'm working on a project where I have a two flow controller controlling the volumetric flow rate (in the order of 0.01-0.1ml/min) of two different gases. The gases are mixed together and I'm wondering if there's a way to figure out the exiting volumetric flow rate of the combined flow and...

(I): dU=dW+dQ also (II): dU=\frac{3}{2}RdT if you compress a gas dW in dU is positive from pV=nRT lesser volume could either mean more pressure or more T. If dV gives dp only then dT=0 how can then dU for dW in (I) be equal dU in (II)?

Hi, I am looking for the thermophysical (viscosity, thermal conductivity, diffusivity, linear expansion, dansity) values of gases and liquids at various pressure. Can anyone tell me any useful resource of finding this data. Thanks Misbah

Well i know real gases behave as ideal gas (almost) when pressure is low and temperature is high. I want to understand this - When pressure is low attractive forces in the gas moelcules will be stronger(as compared to high pressure) but the fast movement due to high temperature compensates it...

Homework Statement The gases in this room include oxygen (molar mass 32 g), nitrogen (28 g), water (18 g), and carbon dioxide (44 g). Which type of molecule has the highest average speed? A) O2 B) N2 C) H2O D) CO2 E) They have the same average speed. Homework Equations...

For any system where the thermodynamic limit exists, we know that the internal energy U, the entropy σ, the total particle number N and the total volume V are all extensive. Because of this, we know that the Euler relation holds true U = -PV + \tauσ + \muN and that the chemical potential...

The kinetic theory of gas state that p=(1/3)(N)(m)(u^2)/(V). In one step of its derivative related to change of momentum and force given to the wall (Refer to Cubic Container and molecule movement in x,y,z axes in attachment), the equation is given by: change in momentum / time = force...

What would happen if we in the reactor, which runs Fusia, adding Fe atoms or atoms of inert gases.? She would regulate Fusia?. Thank you.

Homework Statement I was studying about gases..and a thought struck me: we are taught that gases have no fixed volume. They occupy whole of volume of container in which they're placed. so what are we trying to calculate by the equation PV=nRT . I mean at a particular P T and n, place the gas...

I simply report what I read: "For an ideal gas, but for every kind of transformation ∆u=Cv ∆T, while for every kind of material in the thermodynamic system, but only for isochoric transformation ∆u=Cv ∆T." Where does this second statement come from? Everything is clear about ideal gases, but I...