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01:48

Keenan M.

What is electronegativity? What are the periodic trends in electronegativity?

00:48

Eugene S.

If energy flows out of a chemical system and into the surroundings, what is the sign of Esystem?

03:16

Kevin C.

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.)

03:00

What is heat capacity? Explain the difference between heat capacity and specific heat capacity.

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in this question that give us the skull that has a carbon 14 decay rate off 4.5. Disintegration is per minute with the units over here. Now, living organisms have 15.3 this integrations per minutes. Hold This call is they do not at this in the question, but they want us to know the hall five off carbon 14 decay equals 25730 years. Now how we're going to do find this answer is we first need to find the k t one or two equals to 0.693 Do I buy K and are que will be equal to 0.693 Divide by 5730 And it will be 1.209 times 10 to the power of negative four per year. After knowing this, what we want to do is writing our equation. Ellen Rates at Time t Do I buy rates at time? Zero equals two minus Katie. So what you want to do is to Seoul. 40 equals two. Let's put a negative. Ellen rates at t d y by rates at zero all. Do I buy the K so this will be equal to Ln alright a T s 4.5 because this is dead now. And the living organism which is the initial concentration 15.3 Divide by the K 1.209 times tend to the poor of negative four for years. So our T is going to be equal to 1.1 times tend to the poor of four years.

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