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vampirchik [111]
3 years ago
15

You want to recrystallize the product from a nucleophilic substitution reaction. After adding a minimal amount of hot 95% ethano

l to dissolve all the crystals and letting the flask cool to room temperature crystals do not form. To induce crystallization and maximize the % recovery, one should:_______.
A) Boil off some solvent
B) Scratch the flask
C) Add a seed crystal
D) Cool the flask in an ice bath
E) Any of the above
Chemistry
1 answer:
Troyanec [42]3 years ago
6 0

Answer:

B) Scratch the flask

C) Add a seed crystal

Explanation:

Two important methods to induce crystallization in this case are;

1) Scratch the flask

2) Add a seed crystal

However, the rate of crystallization becomes slower at lower temperature hence cooling in an ice bath should only be applied before the crystals form. When the crystals start forming, the system should be maintained at room temperature.

The question clearly stated that a minimal amount of hot 95% ethanol was added to dissolve all the crystals hence you do not need to boil off some solvent. Boiling off solvent is applied when too much solvent is used.

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33 protons 36 electrons 45 neutrons
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As has an atomic number of 33, so it has 33 protons.  

It has a charge of 3-, so there are three more electrons than protons. Thus, there are 36 electrons.  

It has a mass of 75, which is the sum of neutrons and protons.  

33+n=75 ---> n = 75 - 33 = 42 neutrons  

The answer is e) 33 protons, 42 neutrons and 36 electrons.

6 0
3 years ago
If 57.3 l of 0.497 m koh is required to completely neutralize 39.5 l of a CH3COOH solution. What is the molarity of the acetic a
bearhunter [10]

The molarity of the solution will be 0.72 m.

The majority of reactions take place in solutions, making it crucial to comprehend how the substance's concentration is expressed in a solution when it is present. The number of chemicals in a solution can be stated in a variety of ways, including.

The symbol for it is M, and it serves as one of the most often used concentration units. Its definition states how many moles of solute there are in a liter of solution.

Given data:

V_{1} =57.3 L\\V_{2} = 39.5 L\\M_{1} = 0.497 m\\\\M_{2} = ?

Molarity can be determined by the formula:

M_{1} V_{1} = M_{2} V_{2}

where, M is molarity and V is volume.

Put the value of given data in above equation.

57.3 × 0.497 m = M × 39.5 L

M = 0.72 m

Therefore, the molarity of the solution will be 0.72 m

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6 0
1 year ago
A substance registers a temperature change from 20°c to 40°c. to what incremental temperature change does this correspond?
Alik [6]
If u are multiplaying it would be 80 percent more likely
or if u are subtracting it would be 20 percent
4 0
3 years ago
Particles of clay and silt eroded and deposited by the wind are called
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4 0
3 years ago
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viva [34]
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3 years ago
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