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OLEGan [10]
2 years ago
5

Which statement best explains why so many fossils look different from the millions of species currently living on Earth?

Chemistry
2 answers:
lianna [129]2 years ago
3 0

B. Most species that have lived on earth are now extinct. Ap3x

Nana76 [90]2 years ago
3 0

Answer:

B.

Explanation:

Most species that have lived on Earth are now extinct

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A P E X

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water - Yes because the do drink water

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Explanation:

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You wish to construct a buffer of pH=7.0. Which of the following weak acids (w/ corresponding conjugate base) would you select?
Alex17521 [72]

Answer:

C.) HOCl Ka=3.5x10^-8

Explanation:

In order to a construct a buffer of pH= 7.0 we need to find the pKa values of all the acids given below

we Know that

pKa= -log(Ka)

therefore

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B) similarly PKa of HF= -log(7.2 x 1 0^-4)= 2.7644

C)  pKa of HOCl= -log(3.5 x 1 0^-8)= 7.45

D) pKa of HCN = -log(4 x 1 0^-10)=  9.3979

If we consider the  Henderson- Hasselbalch equation for the calculation of the pH of the buffer solution

The weak acid for making the buffer must have a pKa value near to the desired pH of the weak acid.

So, near to value, pH=7.0. , the only option is HOCl whose pKa value is 7.45.

Hence, HOCl will be chosen for buffer construction.

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