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Rice University

Brown University

05:57

Monique C.

What is energy? What is work? List some examples of each.

02:00

Wilson M.

Explain the difference between a pure covalent bond, a polar covalent bond, and an ionic bond.

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?

00:56

Kevin C.

How is the change in internal energy of a system related to heat and work?

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in this question, we have a mentor that contains 0.556 g off pp 206 for every 1 g off. You're a new to 38 assuming the metro did not contain any PB when it was forming. Determine the age. So basically what happens is due to 38 the case to P 206 and the whole five is 4.5 billion years. So how we're going to find this is first, let's start with finding using the half life equation to find decay. 0.693 divide by Okay, Soling for r K equals to 0.693 Do I buy 4.5 times 10 to the power of nine years and this will give us 1.54 times 10 to the power of negative 10 years Now we found our K. We need to find how much off uranium has been decomposed over the time. So how are you going to do that? Is we had 0.556 grams off PB 206. Now, for every bumble off PB, we have 206 g off PB and for everyone. Mall off uranium 2 38 if you're using, but more off PB 206 and to convert the malls to the mass off the uranium. 238 g off uranium 238 per mall off uranium 228. And what we're going to get is zero point 6424 Gramps off uranium. Now, this is the amount that is lost. So if you want to write our question Ln anti divide by zero equals two minus Katie. And we want to solve 40 because they ask us the time so t will be equal to there is a negative Ellen and T. Dwight by in zero all divide by the case. So our Ellen NT is 1 g. This is what we have over here for every 1 g off uranium and initial amount is what we lost. Plus what we have So one Plus What? We lost this here. I'm sorry. Zero point 64 24 in all. Divided by 1.54 times 10 to the power of negative 10. This cave we found over here and solving this equation will get 3.2 times 10 to the power of nine years

03:38

03:11

01:59