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Luden [163]
2 years ago
7

John is outstanding forward on his club select soccer team. He is know for his ball control and speed. After a game he often mak

es a sketch of moves that were successful. The dotted line on his sketch shows the direction the ball was moving before he kicked it.
Chemistry
1 answer:
natima [27]2 years ago
4 0

Answer:

This self evaluation helps them to better his sport.

Explanation:

This is the right way to evaluate the performance of John because this sketch shows him the way he perform in the match. Due to this sketch he can better his performance and remove all the mistakes he had done in the match which results in better performance of John in the next match. This self evaluation helps them to better his sport and got new chances in order to select for a better club or national soccer team.

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Assuming we have 100 g of sample

30.45/MW of N 14g = 2.175

69.55/MW of O 16g = 4.34

4.34/2.185 = 2

for every 1 mole of N we have 2 moles of O

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2 years ago
Radioactive cobalt-60 is frequently used in treating cancer. It took 24 years for a 10 gram sample to decay to 0.625 grams. What
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Half life is 6 years.

Explanation:

T½ = In2 / λ

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But N = No * e^-λt

Where N = final mass after a certain period of time

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No = 10g

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N = No* e^-λt

N / No = e^-λt

λ = -( 1 / t) In N / No (inverse of e is In. Check logarithmic rules)

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T½ = 6.00 years.

The half life of radioactive cobalt-60 is 6 years

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