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Helga [31]
3 years ago
15

Which of the following choices must occur during all chemical changes

Chemistry
2 answers:
ELEN [110]3 years ago
7 0
It would be C! An energy change. Usually it changes heat - could be less or more.
I hope all is well, and you pass! Good luck, rockstar! You got this. (:
Aleksandr [31]3 years ago
4 0
Nooooo it's not c it's b
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A solution is saturated in both nitrogen gas N2 and sodium iodide NaI at 50 degree Celsius. When the solution is cooled to 25 de
xxMikexx [17]

Answer:

b. some sodium iodide will precipitate out of solution

Explanation:

We know that for salts solubility decreases as the temperature of the solution decreases. So, NaI being a salt, its solubility will surely decrease when the temperature is cooled down to 25°C from 50°C.

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enyata [817]

Colligative properties calculations are used for this type of problem. Calculations are as follows:<span>


ΔT(freezing point)  = (Kf)(molality)
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Tf = 1.86m + 102.08

The concetration of the solution is needed in order to obtain a specific value.

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