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Category Archives: #question

Rant4u’s New Astore

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Come check out the latest items to hit the market.  Amazon has some of the best deals around and you wont get a lower price!  So, come shop here and show your support for Rant4u, and remember all profits will be donated to charity.

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So what is a freight broker?

Freight brokers help shippers that need to move freight from point A to point B by finding a carrier (trucking company) that will haul the freight for slightly less than the shipper is willing to pay them… thus the term BROKER!

In other words freight brokers, sometimes referred to as load brokers, truck brokers, or transportation brokers, are all middle men that match available shipper freight with available trucks while earning between 10% and 35% profit per shipment.

That means brokers typically earn between $100 to $500 per shipments but I have earned as much as$5,175 per shipment just for finding a truck to haul our customer’s freight!  Find out more information here !

Manners are still a minefield as modern technology confuses

E-cigarette

Debrett’s, an authority on British manners, has published for the first time the questions they are most frequently asked by the public. But are manners something people still take seriously and how have they changed, asks Luke Jones.

Far from which fork to use for asparagus or how to address an Earl, the most popular questions asked of Debrett’s have a modern flavour. E-cigarettes, mobile phones and aeroplane seats are troubling the polite most of all.

A lot of technology is still relatively new, says Jo Bryant, an etiquette tutor at Debrett’s. “We’ve learned how to use them from the mistakes we’ve made, from when we have been rude or upset people.”

The polite use of mobile phones was the most queried. But new developments in communication technology have always thrown up questions of manners. An article in the Surrey Mirror in 1932 called for a phone code of conduct to be introduced, to stop the wasting of “valuable minutes”.

“Don’t mumble. Don’t shout. Speak slowly and naturally. Don’t exasperate your friends by leaving a maid who behaves like a nervous ninny to take phone messages. Teach the girl to answer properly.” The article even suggested regularly ringing your own number to check whether those in your own home “answer calls in the right way”.

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How Much Energy is Released?

How much energy (in kilojoules) is released when 7.40g of water at 39.0∘C is cooled to -18.0∘C? The heat of fusion of water is 6.01 kJ/mol, and the molar heat capacity is 36.6 J/(K⋅mol) for ice and 75.3 J/(K⋅mol) for liquid water.

What is the Radius of a Tungsten atom?

The length of a unit-cell diagonal that passes through the center atom in tungsten is equal to 549 pm.

What is the radius (in picometers) of a tungsten atom?

What is the entropy of vaporization?

Naphthalene, better known as “mothballs,” has bp= 218∘C and ΔHvap = 43.3kJ/mol.

What is the entropy of vaporization, ΔSvap [in J/(K⋅mol)] for naphthalene?

Dalton’s Law of Partial Pressure

A 1-L flask is filled with 1.10g of argon at 25 ∘C. A sample of ethane vapor is added to the same flask until the total pressure is 1.40atm .

What is the partial pressure of argon, P(Ar), in the flask?

What is the partial pressure of ethane, P(ethane), in the flask?

Biochemical Applications of the Gas Laws

The various gas laws can be used to describe air, which is a mixture of gases. In some cases, these laws have direct application to the air that we breathe.

A.)  How long does it take a person at rest to breathe one mole of air if the person breathes 80.0mL/s of air that is measured at 25 ∘C and 755 mmHg?

B.)  Typically, when a person coughs, he or she first inhales about 2.30L of air at 1.00 atm and 25 ∘C. The epiglottis and the vocal cords then shut, trapping the air in the lungs, where it is warmed to 37 ∘C and compressed to a volume of about 1.70 L by the action of the diaphragm and chest muscles. The sudden opening of the epiglottis and vocal cords releases this air explosively. Just prior to this release, what is the approximate pressure of the gas inside the lungs?

C.)  Helium-oxygen mixtures are used by divers to avoid the bends and are used in medicine to treat some respiratory ailments. What percent (by moles) of He is present in a helium-oxygen mixture having a density of 0.538g/L at 25 ∘C and 721 mmHg?

 

Partial Pressure and the Ideal Gas Law

The ideal gas law, PV=nRT is independent of the kind of gas. In other words, the pressure exerted by a given number of ideal gas particles is the same whether the sample consists of all one type of particle or a mixture of different kinds of particles.

Therefore, the pressure exerted by a mixture of gases can be expressed as follows:

Ptotal=(n1+n2+n3+⋯)RTV=ntotalRTV

partial pressure is the pressure exerted by just one type of gas in a mixture. A partial pressure is calculated using only the number of moles of that particular gas, instead of the total number of moles:

P1=n1RTV, P2=n2RTV, P3=n3RTV,etc.

The sum of the partial pressures is equal to the total pressure in the mixture:

Ptotal=P1+P2+P3+⋯

Air is about 78.0% nitrogen molecules and 21.0% oxygen molecules. Several other gases make up the remaining 1% of air molecules.  What is the partial pressure of nitrogen in air at atmospheric pressure (1 atm)? Assume ideal behavior.

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