H@z@r@h

For the equilibrium A (g)--> B + C (g) Kc=2 .Calculate the concentrations of A, B, and C in 1-liter box if initially

(a) 1 mol each of A, B, and C are added to the box ;

(b) 2 mol each of A, B, and C are added ;

(c) 3 mol each of A, B, and C are added .

H2O2 + Mn^2+ --> MnO4^- + H^+ + H2O

Mn^2+ --> MnO4^- (+2 --> +7) = Oxidation

Half equation:

Mn^2+ --> MnO4^- + 5e-

I've problem with the reduction half-equation for this problem...Help!

A radioactive material contains two radionuclides, one has a half-life of 1 day and another has a half-life of 8 days. Initially the radioactivity of the shortlived nuclide is 128 times greater than that of the longlived nuclide. When will their activities be equal?

I know the answer :8 Days. I have the solution as well but it's too long. I would like to have the shortest, easiest and simplest solution to this problem. Thanx.

A radiologist finds a radioactive with no date of acquisition on it. He places the sample in front of a canter and records an activity of 16000Bq. He then places a similar sample that has just arrived in front of the canter and records the activity of 128000Bq. How long the unlabelled sample has been in the lab, if the 1/2 life of the material is 6 days?

A large water drop of radius R= 5mm, becomes 64 small drops of the same radius r. Find:

a) Radius r of the small drops

b) Work that has to be performed to breakup the large drop into 64 small ones.

(Surface Tension = 72 x10^-3)

An X-ray tube is operated at 50kV.

a) Find the highest frequency for emitted radiation

b) How Much heat is produced by each accelerated electron that does not produce an X-Ray

If a beam of X-rays is incident upon material that has an absorption coefficient of 200 cm^-1, what thickness is necessary to reduce the number of emerging x-ray photons to one-half of the number of incident photons?

If a beam of X-rays is incident upon material that has an absorption coefficient of 200 cm^-1, what thickness is necessary to reduce the number of emerging x-ray photons to one-half of the number of incident photons?

An X-ray tube is operated at 50kV.

a) Find the highest frequency for emitted radiation

b) How Much heat is produced by each accelerated electron that does not produce an X-Ray

A radioactive material contains two radionuclides, one has a half-life of 1 day and another has a half-life of 8 days. Initially the radioactivity of the shortlived nuclide is 128 times greater than that of the longlived nuclide. When will their activities be equal?

Solution of (^131 I) is used for thyroid scanning. Only 0.5ml is needed to inject. The half-life of (^131 I) is 8 days.

a) If the solution has been stored for 11 days, how many ml will be used for the same scanning?

b) If the quantity of injection each time is not over 8ml. What is the effective life of solution?

A radionuclide used to scan for organ has a physical half-life of 8 days, its biological half-life in this organ is 3 days. How many does that effective half-life have? If the initial radioactivity in this organ is 100 mCi. How many will it be in 11 days?

Water in an enclosed tank is subjected to gauge pressure of 2.0x10^4 Pa, applied by compressed air introduced into the top of the tank. There is a small hole in the side of the tank 5.0m below the level of the water. What is the SPEED with which water escapes from this hole?

At a certain point in a pipeline the velocity is 1.00ms^-1 and the gauge pressure is 3.0x10^5 Pa. Find the gauge pressure at a second point in the line 20.0m lower than the first, if the cross section at the second point is one-half that at the first. The liquid in the pipe is water.

What work has to be performed to break up 1kg of pure water at 20 Degree Celcius into drops of one micron in diameter at the same temperature? The initial surface of the water is small as compared with the total surface of all the drops and it may be neglected.

What work is required to blow a soap bubble 10cm in diameter at 20 Degree Celcius? (Surface Tension = 0.04Jm^-2)

At a certain point in a pipeline the velocity is 1.00ms^-1 and the gauge pressure is 3.0x10^5 Pa. Find the gauge pressure at a second point in the line 20.0m lower than the first, if the cross section at the second point is one-half that at the first. The liquid in the pipe is water.

Water in an enclosed tank is subjected to gauge pressure of 2.0x10^4 Pa, applied by compressed air introduced into the top of the tank. There is a small hole in the side of the tank 5.0m below the level of the water. What is the SPEED with which water escapes from this hole?

What is your personal opinion about that movie? I'm planning to watch it 2morrow, but would like to get some input 1st from you guys. Thanx.=)

The Timesonline web site set the connection between Darwinism(Theory of Evolution) and the killings in question out on 8 November, 2009.

http://www.timesonline.co.uk/tol/news/science/biol...

Each one believed, as a requirement of Evolutionists ideology, that the weak needed to be eliminated and destroyed. Because they regarded their friends and teachers as animals, it was not hard to slaughter them with that mindset. On the contrary, they thought that killing these people would contribute to society and the future.

Under the rule of communist and fascist dictators with a huge admiration for Darwin, the world wars were where Evolutionists ideology has been fully implemented. Three hundred fifty million people were martyred or slaughtered in these conflicts. This terrible bloodshed is the most savage consequence of heretical Evolutionists ideology. These great world wars have now been replaced by murders, massacres, civil conflicts, degeneration and racism. School massacres are a further and terrifying dimension of this devastation and destruction wreaked by Evolution propaganda.

If a young person regards his family, friends, teachers and other people as animals, if he believes that everything in his life, himself included, is the work of chance, and if he thinks that the strong must survive while the weak are eliminated and destroyed, then it is very easy for such a young person to slaughter someone he “regards as unnecessary and worthless according to natural selection.

It's really weird and unfair that people will go all the way out to say, " That has nothing to do with theory of evolution but it's due to lack of morality and understanding about Evolution" although the students openly admitted that they killed under the name of "Natural selection"........but when it comes to religion, people say, " Islam and Christianity are religions of terrorist as the muslims and christians did it under the name of religion"......when ACTUALLY it has nothing to do with the religion, but simply lack of morality and understanding of their scriptures as well.........Why is there double standard in judgement?