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4 years ago

What happens if you don't use enough solvent for a recrystallization?

1 answer:

6 0

With too little solvent, recrystallization occurs too quickly due to massive nucleation upon the flask becoming cooler. The crystals do not grow fully in this shortened period of time, as the solvent precipitates before the reaction is complete. Nucleation of the crystals also means more impurities in the final product.. .

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Why do noble metals do not corrode in air?

adell [148]

They are at equilibrium naturally. They do not easily get attacked by acids and are virtually impossible to oxidize due to their stable nature.

5 0

3 years ago

(50 POINTS!!!)

Brrunno [24]

Answer:

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2. the other bulb would not light

3. the other bulb lit normally

4. the series curcuit with 1 bulb was brighter than the series circuit with 2 bulbs

5. both bulbs were illuminated equally

Explanation:

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3 years ago

What is the difference between a heterogeneous and a homogeneous mixture?

salantis [7]

Answer:

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3 years ago

How many moles of atoms oxygen are in 4.92x10^24 molecules of KNO2?

Nana76 [90]

Answer:

8.17

Explanation:

from

N=n×La

n=N/La

n=4.92×10^24/6.022×10^23

n= 8.17 moles

8 0

3 years ago

If five moles of a gas at a pressure of 5.4 kpa have a volume of 120 liters, what is the temperature?

ra1l [238]

<h3>The temperature is 15.58 kelvin </h3>

Solution:

Ideal gas equation is given as:

$PV = nRt$

Where,

P = pressure

V = volume

n = amount of substance

R = ideal gas constant

T = temperature

From given,

V = 120 liters

n = 5 moles

$R = 8.314\ \frac{Lkpa}{mol\ K}$

P = 5.4 kPa

T = ?

Therefore,

$5.4 \times 120 = 5 \times 8.314 \times T\\\\648 = 41.57 \times T\\\\T = 15.58\ kelvin$

Thus the temperature is 15.58 kelvin

4 0

3 years ago