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uranmaximum [27]
3 years ago
7

Plzzz helpp me fast hdhskekwkjdbdjewi

Chemistry
2 answers:
lana [24]3 years ago
5 0
I think it’s A makes the more sense I think A forms further down not sure though
Natasha_Volkova [10]3 years ago
3 0

Answer:

none of the above

Explanation:

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4. If the earth were to heat up by 3 degrees, approximately how much would the sea level rise?
Ksju [112]

The sea level would rise by some 50 meters.

Explanation:

If the earth's temperature increases by 3 degrees the north and south pole would experience the ice melt at high speed.

The life will get difficult on the plains.

The extinction of some species will happen.

The sea level would rise by 50 meters. The increased sea level will cause depletion of habitat from plants and animals.

The floods will occur, land erosion, soil for agriculture land will get contaminated with the salt.

8 0
3 years ago
Examine the snapshot of sedimentary layers shown here. Which statements accurately describe the relationship between these organ
nignag [31]

Answer:

The answer is: Species A is more primitive than species B.

Explanation:

Species A has worse genetics than all the other fishes.

4 0
2 years ago
______________ yield about 4 kcal/g when completely oxidized, whereas ___________ yield about 9 kcal/g.
Aleks [24]
Proteins and carbohydrates <span>yield about 4 kcal/g when completely oxidized, whereas fats yield about 9 kcal/g.</span>
3 0
3 years ago
The half-life of 232-Th is 1.4 x 10^10 years.if there were 25.0 grams of thr sample left after 2.8 x 10^10 years,how many grams
EleoNora [17]

<span>1.    </span>For this problem, we use the formula for radioactive decay which is expressed as follows:<span>

An = Aoe^-kt

where An is the amount left after time t, Ao is the initial amount and k is a constant. 

We calculate as follows:

An = Aoe^-kt
0.5 = e^-k(1.4x10^10)
k = 4.95x10^-11

An = Aoe^-kt
25 = Aoe^-</span>4.95x10^-11<span>(2.8x10^10)
Ao = 100 g</span>

7 0
4 years ago
You have 50 ml of a complex mixture of weak acids that contains some HF (pKa = 3.18) and some HCN (pKa = 9.21). Which is larger,
bonufazy [111]

Answer:

\frac{[F^{-}]}{[HF]} is larger

Explanation:

pK_{a}=-logK_{a} , where K_{a} is the acid dissociation constant.

For a monoprotic acid e.g. HA, K_{a}=\frac{[H^{+}][A^{-}]}{[HA]} and \frac{[A^{-}]}{[HA]}=\frac{K_{a}}{[H^{+}]}

So, clearly, higher the K_{a} value , lower will the the pK_{a}

In this mixture, at equilibrium, [H^{+}] will be constant.

K_{a} of HF is grater than K_{a} of HCN

Hence, (\frac{F^{-}}{[HF]}=\frac{K_{a}(HF)}{[H^{+}]})>(\frac{CN^{-}}{[HCN]}=\frac{K_{a}(HCN)}{[H^{+}]})

So, \frac{[F^{-}]}{[HF]} is larger

5 0
3 years ago
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