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Questions tagged [gas]

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8 votes
1 answer
997 views

What is 'spray foam' or 'expanding foam'?

At the wikipedia are: Spray foam (expanding foam in the UK) is a chemical product created by two materials, isocyanate and polyol resin, which react when mixed with each other and expand up to 30-60 ...
Imyaf's user avatar
  • 191
5 votes
2 answers
499 views

Colour composition of Bromine during diffusion?

Consider the diffusion of Bromine Gas within a tube filled with air. After a prolonged period of time, is the colour composition uniform? From my understanding, Bromine is a denser gas. Hence, on ...
Beamon's user avatar
  • 69
4 votes
2 answers
497 views

What determines how easily a gas can diffuse into a crystal structure?

I have been told by a metallurgist that the reason a factory oxidizes the iron oxides in ilmenite before reducing them down to pure iron, is that the the products of this have a more spacious crystal ...
user110391's user avatar
3 votes
1 answer
51 views

Reaction of Heliox and seawater on commercial diving vessel

I work on a commercial diving vessel in the Persian Gulf. We have equipment that regularly goes sub sea. On occasion this equipment springs a gas leak, the gas leaking is a mixture of oxygen and ...
Dalmain's user avatar
  • 41
1 vote
3 answers
231 views

Aqueous state on CO2 and O2 in the Photosynthesis Chemical Equation

While reading through a book I came across the equation for photosynthesis: $$ \ce{6CO2(aq) + 12H2O(l) -> C6H12O6(aq) + 6O2(aq) + 6H2O(l)}\tag{1} $$ in the presence of sunlight + chlorophyll. For ...
entropy's user avatar
  • 23
1 vote
1 answer
114 views

Is my CO2 in liquid form in a mixed gas cylinder?

I recently acquired a 5-liter mixed gas cylinder that has 70% nitrogen and 30% carbon dioxide, used for dispensing beer. The cylinder pressure is 200 bar (2900 PSI) and my room temperature is around ...
StoutEnthusiast's user avatar
1 vote
0 answers
36 views

Using Hydrogen as a carrier gas for a GC; consideration of reactivity with analytes

In many cases people use H2 as a carrier gas for a GC. But does this exclude analysis of (say) systems with unsaturation or aromatic compounds etc. If a analysis uses a temperature program say up to ...
curious_cat's user avatar
  • 1,638
0 votes
1 answer
67 views

Rotten Egg Gas Smell

Background context for question When I was young, we'd go fishing. And Dad would put a camper on the back of the truck. One time we came back in after fishing and the camper smelled like rotten eggs. ...
Epimanes's user avatar
  • 111
0 votes
0 answers
50 views

Dissolution of CO2 over time in a high pH solution

I asked this question in the biology stack-exchange but thought it might be more appropriate here. I am running a batch experiment using penicillin bottles where I have bacteria growing for 21 days in ...
Franco Grosso's user avatar
-1 votes
2 answers
146 views

At what temperature is ammonia liquid at 1.5 bars? [closed]

I would like to know at what temperature ammonia condenses from gaseous form into a liquid, at a pressure of 1.5 bars. I know that at normal 1 bar pressure, ammonia is a liquid between -78 and -33 ...
Chemistrynoob's user avatar
-1 votes
0 answers
39 views

Different definitions for work in physics and thermodynamics [duplicate]

In physics, work is defined as the force applied on an object multiplied by the distance traveled by that object. However, in thermodynamics, work is defined as a function of the opposing force. For ...
SerMig1111's user avatar
-2 votes
1 answer
247 views

Can a heated gas leave a container through downwards direction?

If I have a flask full of heated gas, with an opening at the BOTTOM of the flask and connected pipe facing downwards, can the heated gas can leave the flask through that opening? And for an alternate ...
user137670's user avatar
-3 votes
2 answers
62 views

Volume of gas mixture [closed]

I have inlet to a reactor formed by equimolar CH4 and NH3, I want to find the volume of this gas mixture. First I wanted to calculate the sum of individual volumetric flow rates from V = m*rho. ...
Laman Alipashayeva's user avatar
-4 votes
2 answers
147 views

When a gas is expanded, why doesn't the number of moles of a gas increase despite it's volume increasing? [closed]

This question might be elementary, but it is genuine. I realise that some users might downvote the question for being so basic, but I urge them to be a little merciful, and help out a confused high ...
Bongo Man's user avatar
  • 369
-4 votes
1 answer
461 views

According to PV=nRT,if we increase temp,no of moles will decrease,but no of moles is dependent on mass,mass is constant,then how can moles change?

We know the ideal gas equation is PV=nRT,then, according to this,if we keep Pressure,volume to be constant,then on increasing temperature,no of moles will reduce,this would mean that mass of matter or ...
Aakash's user avatar
  • 3