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University of Maryland - University College

University of Kentucky

Brown University

02:46

Kevin C.

What is kinetic energy? What is potential energy? List some examples of each.

01:49

What is internal energy? Is internal energy a state function?

03:16

If two objects, A and B, of different temperature come into direct contact, what is the relationship between the heat lost by one object and the heat gained by the other? What is the relationship between the temperature changes of the two objects? (Assume that the two objects do not lose any heat to anything else.)

03:09

Shahriar K.

Suppose that a buffer contains equal amounts of a weak acid and its conjugate base. What happens to the relative amounts of the weak acid and conjugate base when a small amount of strong acid is added to the buffer? What happens when a small amount of strong base is added?

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in this question. They want us to write a nuclear equation for these history questions. And what we have in the first one is the B B to Decay BK 249 this to 49 cents for the mass number. And since we have the isotopes, for example, we have B K. And once you look at the parent table, you'll see the autumn IQ number is 97 and this what we call an isotope is the same number off protons. But different number of neutrons would make a different number of mass. In this question. They're telling us the mass is going to be 2 49 and this will go through a bitter decay. So I'm going to show a B to the K 91 to 0. So the right hand sides atomic numbers. Once we add them all up, they have to be equal to 97. What we could have is 98 minus 1 97. So that looks a like a good number. And what corresponds to this atomic number iss CF in the period example and the mass does not change because this is a zero. So it will stay to 14 9, second one, positron emission, potassium 40. And what we look at in the periodic table is, of course, the atomic number, which is 19. And this will go to a positron emission and Pastrana is going to be plus one and zero. So what we can have is 18 because 18 plus one would give us 19. And the corresponding as, um is going to be Oregon and the mass does not change. So we keep 40. And lastly, if you have the dean, the Mass is 111. And once we look at the period table, we see that the proton number is 53. It captures an electron which is negative 1 to 0. So what we're going to have is an atom, very 53 minus one is 52 and that atom corresponds to E. And the mass is not going to change. So it is 111 again

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