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Cerrena [4.2K]
4 years ago
8

While performing a recrystallization, a chemist notices that a small amount of the sample will not dissolve, even after the recr

ystallization solution has been boiling for some time. Select the correct course of action.
A. Perform a gravity filtration with a stemless funnel.
B. Perform a gravity filtration with a long-stemmed funnel.
C. Isolate the insoluble material via filtration, grind it into a powder, and add it back to the recrystallization solution
D. Cool the recrystallization solution to room temperature and then heat it again to dissolve the insoluble material.
Chemistry
1 answer:
Tpy6a [65]4 years ago
7 0

Answer: A. Perform a gravity filtration with a stemless funnel.

Explanation: Gravity filtration with a stemless funnel prevent blocking up the funnel. Undissolved sample may come out in the stem when the solution cools down thus will be blocking the funnel. Using stemless funnel prevent this problem.

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jonny [76]
One liter of gasoline = 1.35 euros.

To convert this to dollar, you just need to multiply :

1.35 x 1.07 $

= $ 1.445
8 0
3 years ago
Use the Gizmo to find the freezing, meting, and boiling points of water at 5,000 meters (16,404 feet). Write these values below.
tekilochka [14]

Answer:

See explanation

Explanation:

Freezing point and melting point increases slightly at higher altitude

The boiling point decreases at higher altitudes.

Air pressure decreases with altitude As a result of this, atmospheric pressure decreases and water must now boil at a lower temperature. In order to compensate for this lower boiling point of water, food must take a longer time to cook. The lowering of air pressure actually means that the air becomes thinner at higher altitudes.

Pressure cookers cook food at high pressure thereby reducing the cooking time significantly. This helps to retain 50% of the nutrients in the food, lower the kitchen temperature and lower the energy cost required to cook food.

5 0
3 years ago
Calculate the quantity of energy required to change 8.22 mol of liquid water to steam at 100oc. the molar heat of vaporization o
Ainat [17]
Since  the water  is  at  100 degrees  then   it take  40.6 kj/mol   to  change 1  mole of  water at 100 degrees into  steam at  100  degrees
  the  moles  of water  8.22mol
since  one  mole  take 40.6kj/mol   8.22mol  will  be  =
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4 0
3 years ago
In which biome would you most likely find largemouth bass, rainbow trout, and
il63 [147K]

Answer:

C

Explanation:

Fresh water fish need freshwater.

3 0
3 years ago
A quantity of water vapor at 100​°​C is condensed to liquid water at the same temperature. In the process, 180,414.08 joules of
salantis [7]

Answer:

0.08kg

Explanation:

Given parameters:

Temperature of water  = 100°C

Quantity of heat released = 180414.08J

Unknown:

Quantity of water condensed  = ?

Solution:

This is simple phase change process without any attendant change in temperature.

To solve this problem, use the formula below;

             H  = mL

H is the heat released

m is mass

L is the latent heat of condensation of water  = 2260 kJ/kg

 Insert the parameters and solve;

       180,414.08 = m x  22.6 x 10⁵ J/kg

         m  = \frac{180414.08}{2260000}   = 0.08kg

5 0
3 years ago
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