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vodomira [7]
3 years ago
12

Adaptation: Question 1 Which best explains why a population of a certain species of moose , over five generations , developed fe

et that were two times wider than most moose population populations ?
1. The bogs the moose lived in became so soggy that only moose with the largest could successfully walk on the bog .
2 The bogs the moose lived in became so soggy that only moose with the smallest or the largest feet successfully walk on the bogs .
3.The bogs the moose lived in became so soggy that only moose with medium sized feet could successfully walk on the bogs
4. The bogs the moose lived in became so soggy that only moose with the smallest could successfully on the bogs .
Chemistry
1 answer:
slamgirl [31]3 years ago
4 0

Answer:

im doing this test lol

Explanation:

what is it?

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A chemist titrates 150.0 mL of a 0.2653 M carbonic acid (H2CO3) solution with 0.2196 M NaOH solution at 25 °C. Calculate the pH
xxTIMURxx [149]

Answer:

9.3

Explanation:

This is long and complicated so get ready

We are going to use the conjugate base of carbonic acid with water to make carbonic acid and OH- (Na is simply a spectator ion and is irrelavent here)

Let the conjugate base be A- and Carbonic acid be HA

A- + H20 ⇄ HA + OH-

To find the concentration of A- we must find the concentration of the reactants given. We know this will be equal because it is a strong base and all of it disassociates.

to get moles of acid we take the concentration and multiply by liters to cancel

.2653 x .150 = .039795 mol HA

Because it is at equivalence point we know the moles will be equal. We are given the concentration so we only have to solve for liters

We plug it into the equation and found: .181 L

Now use moles and combined volums to fins concentrarion which is .120 M

Now plug that use the Ka converted to Kb to find the cincentrations of HA and OH-

Ka is (10^-3.60) = 2.4E-4

Kb x Ka is 10^-14

Kb = 3.98E-11

Now we know Kb = [HA] [OH] / [A-]

Solve for this through algebra by using x for the values you dont know

youll find x^2 = 3.3E-10

X = 1.8 E -5

this is the OH- concentration

-log [oh] = pOH

pOH = 4.73

We know 14-pOH = ph so pH= 9.3

6 0
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Lightning is an example of
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Answer:

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The development of new technology requires the evaluation of the overall benefit to cost ratio of the new technology.
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A "FORCE" is required to cause acceleration or cause an object to move.
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The reason an increase in substrate concentration does not increase the reaction rate indefinitely is because
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