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August 27, 2014

Search: thermodynamics

Number of results: 191

chemistry(thermodynamics)
questions related to thermodynamics
March 9, 2012 by werksow

SCI
Please help me in understanding this. Differentiate between the First Law of Thermodynamics and the Second Law of Thermodynamics.
November 8, 2011 by PENNY

science
what is the difference between the First Law of Thermodynamics and the Second Law of Thermodynamics.
June 27, 2010 by teine

Thermodynamics 2nd Law
The 2nd law of thermodynamics states that in any spontaneous process, the total entropy of the universe always increases. Yet in biological systems there are processes where there is a decrease in entropy during a reaction. Give an example of a biological process where ...
May 5, 2011 by Nicole

thermodynamics
Which of these statements are in accord with the three laws of thermodynamics? -A-The entropy of the universe never decreases -B-A nonspontaneous process can occur if it is coupled to a process which is sufficiently spontaneous -C-The temperature of the universe stays the same...
April 29, 2007 by anonymous

Chemsitry
Which of hte laws of thermodynamics provides a criterion for spontaneity? the zeroth law, the first law, the second law, and the third law? This site will give you zeroth, first, second, and third laws. You may need to scroll down a little but it on the right of center of the ...
April 27, 2007 by Cindy

PHYSICS-LAW OF THERMODYNAMICS
A dinner plate drops and breaks. This best illustrates the ______ law of THERMODYNAMICS A. 1st b. 2nd c. 3rd d. 4th I am inclined to say the 1st because energy can be neither created nor destroyed, it can only change forms. Thus the plate falling lost it's energy as a whole, ...
November 13, 2010 by Jael

science
Identify the fruit or vegetable you selected and relate the second law of thermodynamics to the changes in energy observed in Appendix C. How did the amount of energy gained compare to the amount of energy lost as heat at the second through fourth trophic levels? o Answer the...
August 24, 2010 by stephanie

env, sci
distinguish between the first law of thermodynamics energy and the second law of thermodynamics energy Energy as defined in both laws has the same meaning. It is the laws that are different. The second law involves the direction of heat flow, the role of temperature and a ...
July 14, 2007 by Susan

physics
Which of the following is a True Statement? PLEASE EXPLAIN ANSWER A) It is possible for heat to flow spontaneously from a hot body to a cold one of from a cold one to a hot one, depending on whether or not the process is reversible or irreversible. B) It is impossible to ...
August 6, 2007 by stanbee

thermodynamics
what is difrent between cp and cv
January 1, 2009 by aru

chemistry
about thermodynamics
February 11, 2012 by Anonymous

biology
what is the second law of thermodynamics.
March 3, 2011 by Anonymous

chemisttry
what is the significance of delta H,S,G in thermodynamics
June 7, 2012 by chemist

thermodynamics
H = 565 kJ and S = -11.1 J/K Calculate G at 25C for this reaction.
August 25, 2013 by Anonymous

physics
is the bubble chamber an example of thermodynamics?if not then what?
May 28, 2009 by Chris

science
What is a simple definition for the 2nd law of Thermodynamics?
May 25, 2011 by christina

thermodynamic
what is the difference between thermodynamics and heat transfer
June 20, 2011 by mm

Science
Can you please explain about the black hole thermodynamics?
September 26, 2011 by Michael

Biology
4) Explain why organisms do not violate the second law of thermodynamics?
November 8, 2011 by Cassie

thermodynamics
equal to 1/4 th of the heat rejected to the sink. the efficiency of the engine is
February 2, 2013 by Anonymous

Engineering
How does an air conditioner use the first and second laws of thermodynamics?
October 28, 2007 by Kayla

SCI 275
does thermodynamics have a direct effect on a food chain?
November 16, 2007 by dawn

Thermodynamics
Would someone explain entropy in simple terms please. Thanks.
May 3, 2009 by charlie

thermodynamics
how many molecules of air are there in 1 litre flask at 293K, if the preessure in it is 0.3 atm.
March 31, 2012 by frank fred

thermodynamics
how much of energy need to evaporate 1 kg moles of hydrated water
April 26, 2013 by prabhakar

Chemistry
Is it the second law of thermodynamics that provides a criterion for spontaneity? I dont think so yes
March 30, 2007 by Jennifer

physics
'perpetual motion' is ruled out of the realm of possibility because of which law of thermodynamics?
May 12, 2008 by shell

Science
What is the realtionship between the second law of thermodynamics and Gibbs free energy
February 22, 2012 by Steph

Chemistry
How would you define pressure in the unit of thermodynamics? Is it just a force basically?
January 10, 2014 by K

environmental science
I need help understanding the second law of thermodynamics. These terms I just do not seem to understand.
March 10, 2008 by Mimi

Biology
Using the fundamentals of thermodynamics, explain why we must continue to eat in order to maintain homeostasis?
December 2, 2011 by Seth

Science
Your thermodynamics calculation involves mass and a change in temperature. What SI base units would you use?
September 27, 2013 by Gianna

Chemistry (Thermodynamics)
Write a balanced equation for the complete combustion of 1 mole of ethyne gas (C2H2) ?
February 27, 2014 by Amanda

Physical Science
The second law of thermodynamics forbids a heat engine to have thermal efficiency of what?
March 17, 2014 by jasmine

Chem Check
The first law of thermodynamics is the application of the conservation of energy principle to heat and thermodynamic processes.
June 10, 2010 by Amy~

Physics
Use the Second law of thermodynamics to explain why an ice cube cools off your warm soda.
November 18, 2010 by Anonymous

science
Based on the first and second laws of thermodynamics, explain how energy flows through your selected ecosystem
June 20, 2011 by Anonymous

Thermodynamics
In a multiple-device flow system, I want to determine a state property. Where should I look for information, upstream or downstream?
May 13, 2013 by Kyle

sci 275
identify the fruit or vegatable you selected and relate the second law of thermodynamics to the changes in energy observed in appendix c.
December 10, 2007 by mia

physics
A dinner plate drops and breaks. This best illustrates the ______ law of THERMODYNAMICS A. 1st b. 2nd c. 3rd d. 4th
November 12, 2010 by Christina

chemistry
How is it possible for a chemical rxn to be highly spontaneous and have a negative entropy value? Isn't this inconsistent with the 2nd law of thermodynamics?
April 13, 2012 by Anonymous

Science
Relative abundance of weight? If a hawk eats a fish and does not acquire all the energy in the fish's body because of the second law of thermodynamics then what implications would have a relative abundance by weight of predators and their prey? I understand the laws of ...
August 8, 2007 by Rindi

Physics
Use the first law of thermodynamics to determine the amount of heat change, Q, and whther it was added to or removd from the system. W=225J Delta U=600J Q=?
March 11, 2012 by Tracy

Chemistry(DrBob222)
for a thermodynamics lab, I have to graph the ln K vs. 1/T, so does the ln K go on the y-axis and the 1/T go on the x-axis?
December 8, 2013 by K

Biology
In your own words, explain the second law of thermodynamics and explain why it is not violated by living organisms?
July 17, 2011 by Ivy

AP Chemistry
for a thermodynamics lab, I have to graph the ln K vs. 1/T, so does the ln K go on the y-axis and the 1/T go on the x-axis?
December 8, 2013 by K

chemistry thermodynamics
a sample of methane gas of mass 25g at 250k and 18.8atm expands isothermally until its pressure is 2.5atm. calculate the change in entropy.
October 19, 2013 by sam

thermodynamics
Air is compressed isothermally at 20 degree C from 95 Kpa to 750 Kpa. Find the work during the process in KJ.
August 23, 2014 by tup

Physics ~Thermodynamics~
* Pressure * 1) what other ways can the pressure of a gas be changed? * Internal Energy * 2) A cup of hot tea is poured from a teapot, and a swimming pool if filled with cold water. a) Which one has a higher internal energy? b) Which has a higher average of kinetic energy? * ...
March 5, 2013 by Isis

Biology
What law of thermodynamics explains the fact that if you drop an egg, the shell will not spontaneously repair itself? The second law
February 24, 2007 by aj

Thermodynamics
Suppose an enzyme lowers the activation energy by an order of magnitude. What is the ratio of catalyzed rate to the uncatalyzed rate at at 25 C? at 37 C?
April 9, 2012 by Ali

thermodynamics
design a 1200-W electric hair dryer such that the air temperature and velocity in the dryer will not exceed 50 C and 3 m/s respectively
May 21, 2014 by layla

thermodynamics
1. An ideal gas at 40psig and 80 degree F is heated in a closed container to 120 degree F. What is the final pressure, psia?
August 23, 2014 by Anonymous

thermodynamics
deremine (a) the work done and (b) the change in internal energy of 1.00 kg of water when it is all boiled to steam at 100c. Assume a constant pressure of 1.00 atm and heat of vaporisation = 2260000 J.
April 15, 2012 by frank fred

thermodynamics
deremine (a) the work done and (b) the change in internal energy of 1.00 kg of water when it is all boiled to steam at 100c. Assume a constant pressure of 1.00 atm and heat of vaporisation = 2260000 J.
April 15, 2012 by frank fred

Thermodynamics
Determine the units of viscosity,m, in the following equation: t=m(du/dy), where t is a shear stress, u a velocity, and y is a distance in (a) the Engineering English system, and (b) the SI system.
January 4, 2012 by Jack

Thermodynamics (Chemistry)
Ag(s) + Cl2(g) --> 2AgCl(s) ∆H and ∆S are 254.14kJ and 115.0J/K respectively. Calculate equilibrium constant, K for the reaction at 500K?
August 8, 2011 by Alfred

thermodynamics
If 150 kj of energy in used in accelerating a load of 1.5 tones at the rate of 0.56 m/s . Calcukate the distance of the load will have travelled along a level surface
August 14, 2012 by jignesh

college chemistry
If gaseous H2 and O2 are carefully mixed and left alone, they can remain intact for millions of years. Is this stability a function of thermodynamics or of kinetics? Give a valid reason to support your choice.
April 28, 2010 by Stephanie

Chemistry
In thermodynamics, the standard pressure is 100 kPa. What is this value in units of atmospheres. I got 9.86x10^-7 atm but the book said .9869 atm. who's right?
April 5, 2010 by Ana

Vector Calculus
Thermodynamics texts use the relationship (dy/dx)(dz/dy)(dx/dz) = -1 Explain the meaning of this equation and prove that it is true (Hint: Start with a relationship F(x,y,z) = 0 that defines x = f(y,z), y = g(x,z), and z = h(x,y) and differentiate implicitly)
October 4, 2013 by Vincent

chemistry
Utilizing the concept of the second law of thermodynamics, explain why an ice skater requires less energy expenditure to cover the same distance as a roller skater. ?
March 11, 2011 by Anonymous

thermodynamics and kinetics
One mole of an ideal gas undergoes an isothermal reversible expansion, doing 1 kJ of work and doubling the volume. What is its final temperature? How much heat was added to the gas?
October 12, 2012 by Dorota

Thermodynamics
Suppose you start with a liquid mixture of 60% nitrogen and 40% oxygen. Describe what happens as the temperature of this mixture increases. Be sure to give the temperatures and compositions at which boiling begins and ends.
April 10, 2013 by Tina

Thermodynamics
Suppose you start with a liquid mixture of 60% nitrogen and 40% oxygen. Describe what happens as the temperature of this mixture increases. Be sure to give the temperatures and compositions at which boiling begins and ends.
April 10, 2013 by Tina

Thermodynamics
Suppose you start with a liquid mixture of 60% nitrogen and 40% oxygen. Describe what happens as the temperature of this mixture increases. Be sure to give the temperatures and compositions at which boiling begins and ends.
April 11, 2013 by Tina

Thermodynamics
Suppose you start with a liquid mixture of 60% nitrogen and 40% oxygen. Describe what happens as the temperature of this mixture increases. Be sure to give the temperatures and compositions at which boiling begins and ends.
April 12, 2013 by Tina

Thermodynamics
5 mol of an ideal gas is kept at 394◦C in an expansion from 1 L to 5 L .How much work is done by the gas? Answer in units of J.Given: R = 8.31 J/K/mol ,
December 4, 2008 by Sandhya

Science
you are a patent agent, an inventor comes to you claiming he has invented a self-powered engine that requires no fuel to run. will you agree to patent this invention? why or why not? use the first law of thermodynamics. can anyone help me out with this?
November 3, 2007 by Michelle

thermodynamics and kinetics
One mole of an ideal gas at 25C and 1 bar is allowed to expand adiabatically against a constant external pressure of 1.00 bar from 1.00 dm^3 to 10.00 dm^3. Calculate the final temperature, q, w, delta_U and delta_H.
October 12, 2012 by Dorota

physics
can i have multiple choice questions on thermodynamics: relationship between work and heat, the first law of thermodynamic, and the second law of thermodynamic
March 18, 2011 by johny

thermodynamics
the mass of a fluid system is .311 slug, its density is 30lb.ft^3 and g is 31.90fps^2. a) find the specific volume, b) the specific weight, and c) total volume
December 8, 2012 by 18ms

RE: Physics: Thermodynamics
well the second law states that natural processes go in a direction that maintains or increases the total entropy of the universe. entropy is the measure of disorder in a system, so I really do not know the best way to answer this problem
November 18, 2010 by Anonymous

thermodynamics
if a pump discharges 75 gpm of water whose specific weight is 61.5 lb/ft^3(g=31.95fps^2). find a) the mass flow rate in lb/min, and b) and total time required to fill a vertical cylinder tank 10ft in diameter and 12ft high.
December 8, 2012 by 18ms

Thermodynamics
Derive the general expression for the work per kilomole of a van der waals gas in expanding reversibly and at a constant temperature, T, from a specific volume V1 to a specific volume V2.
January 22, 2013 by Anonymous

chemistry
A man consumes 50,000J of heat in doing his work out activities. A serving of his food provides him with 25,000J of energy. Interpret the energy values in terms of first law of thermodynamics.
January 23, 2011 by jaycab

physics/chemistry(Thermodynamics)!!!!!helppppp!
In a certain chemical process,a lab technician supplies 254 j of heat to a system. At the same time,73 j of work are done on the system by iys surroundings.What is the increase in the internal energy of the system?
May 15, 2013 by duke

Thermodynamics
1. The total enthalpy of 15.000kg of steam at 2250.000kPa is 34191.510kJ. Determine the dryness of the steam. ANS = % Not sure where to start. I need a little help please. I do have a chart with the properties of saturated steam. Thank you.
July 13, 2013 by Danny

thermodynamics
if 100ft^3 of atmospheric air at zero fahrenheit temperature are compressed to a volume of 1 ft^3 at a temperature of 200 degree fahrenheit, what will be the pressure of the air in psi?
October 3, 2012 by 111111

Biology 201
Life is sometimes described as a constant struggle against the second law of thermodynamics. How do organisms succeed in this struggle without violating the second law?
February 14, 2010 by Paul

check 3 quick physic questions
Identify the areas of physics involved in each of the following tests of a lightweight metal alloy proposed for use in sailboat hulls: a. testing the effects of a collision on the alloy Would this be relativity since relativity includes particle collisions? b. testing the ...
August 22, 2006 by Anonymous

Thermodynamics
1,3-diphosphoglycerate (1,3-DPG) is a molecule that can be used to regenerate ATP in the body. Explain how this is possible given the coupled reactions below. 1,3-DPG 3-DPG + PO43- G = -49 kJ ADP + PO43- ATP G = 31 kJ
May 6, 2011 by Nicole

Thermodynamics
2. Determine the quantity of heat required, to raise 11.100kg of water at 80.000 degrees Celsius, to saturated steam at 2250.000kPa and 71.400% dry. ANS = kJ Not sure where to start. I need a little help please. I do have a chart with the properties of saturated steam. Thank ...
July 13, 2013 by Danny

Thermodynamics
5 pounds of an ideal gas with R=38.7 and K=1.668 have 300Btu of heat added during a reversible constant pressure change of state, initial temperature=80F. Determine: a.)the final temperature b.)change of internal energy change of enthalpy change of entropy
March 6, 2010 by Janus

Thermodynamics
Sodium carbonate can be made by heating sodium bicarbonate: 2NaHCO3(s) Na2CO3(s) + CO2(g) + H2O(g) Given that H = 128.9 kJ/mol and G = 33.1 kJ/mol at 25C, above what minimum temperature will the reaction become spontaneous under standard state conditions? Report ...
May 2, 2011 by Nicole

thermodynamics
If a carnot engine receives heat from a heat source and discharge 1000J to a heat sink at temperature of 27C in each cycle, calculate the heat received and the work performed by the engine in each cycle
April 28, 2013 by hiqk

thermodynamics
A fluid moves in a steady flow manner between two sections ina flow line. At section 1: A1=10ft2, v1=100ft/min, specificvolume1= 4ft3/lb. At section 2: A2=2ft2, density 2= 0.20 lb/ft3.Calculate the mass flow rate and speed at section 2.
April 25, 2013 by olbap

Thermodynamics
An intrepid explorer takes 400 g of ice from the cold Siberian environment, where the temperature is 40 degrees and places it in a kettle inside his mobile laboratory. The ice melts and he heats the water to +40 degrees. What is the total amount of heat absorbed by the ...
June 6, 2011 by Kristin

thermodynamics
At 2068.44kPaa, 37.8 celcius, 0.142 cubic meter of methane have a total mass of 1.82kg. Using avogadro's principle find the mass of carbong dioxide contained in a 0.85cubic meter tank at 2068.44kPaa,37.8 celsius
September 17, 2012 by chi

thermodynamics
A scuba tank contains 1.5 kg. of air. The air in the tank is initially at 15 degree celcius. The tank is left near an engine exhaust line, and the tank's pressure doubles. Determine the final temperature, change of internal energy, change of enthalpy, and heat.
November 29, 2011 by hermie

thermodynamics
0.5 kg of saturated vapor is contained in a closed system with pressure of 10 bar is cooled at constant volume until pressure decreases to 5 bar. Determine heat transfer and sketch the process in a P-v and T-v diagram answer = -473.35 kJ(heat is transferred from system to ...
April 16, 2012 by shasha

Physics
If a supersaturated sugar solution is allowed to evaporate slowly, sugar crystals form in the container. Hence, sugar molecules go from a disordered form (in solution) to a highly ordered, crystalline form. Does this process violate the second law of thermodynamics? Explain.
November 25, 2012 by S

Physics
A friend asks for money to market a new product he invented. He claims to have invented a "cold plate" that works like a hot plate and will cool down foods and liquids that are placed on it. Should you invest?? Should I be thinking about the second law of thermodynamics here?
April 21, 2010 by sherri

Chemistry - Thermodynamics
A piece of metal of mass 12 g at 104◦C is placed in a calorimeter containing 45.4 g of water at 22◦C. The final temperature of the mixture is 71.5 ◦C. What is the specific heat capacity of the metal? Assume that there is no energy lost to the ...
January 22, 2014 by Anonymous

Physics
Using the first law of thermodynamics explain why the specific latent heat of vaporisation of water is greater than the specific latent heat of fusion of ice. The first law of thermodynamics (conservation of energy) has nothing to do with why vaporization requires more energy ...
June 25, 2006 by Ishani

thermodynamics
A reaction has deltaHrxn=-127 kJ and delta S rxn=314 J/K. At what temperature is the change in entropy for the reaction equal to the change in entropy for the surroundings? so I made delta H-T delta S=0 plugged in values for S and H and solved for T. I got -404.5 degrees K. Is...
February 18, 2009 by Natash

Thermodynamics
A centrifugal pump compresses 3000 liters/min of water from 98 KPa to 300KPa. the inlet and outlet temp are 25C. The inlet and discharge pipe are on the same level but the diameter of the inlet piping is 15cm whereas that of the discharge piping is 10cm. Determine the pump ...
February 16, 2010 by Janus

thermodynamics
A thermometer of mass 0.0550 kg and of specific heat 0.837 kJ/kgK reads 15.0C. It is then completely immersed in 0.300 kg of water, and it comes to the same final temperature as the water. If the thermometer reads 44.0 C, what was the temperature of the water before the ...
January 23, 2012 by chx

Science
Which trophic levels have the most biomass? Which have the most energy? Why? The second law of thermodynamics requires that the primary producers have the most biomass and total energy. See:http://www.physicalgeography.net/fundamentals/9o.html
August 1, 2005 by Donna

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