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nevsk [136]
3 years ago
14

Sophia and her friend Nora have the same unknown solid. Sophia has progressed a little faster with the purification process, but

now she is standing around twiddling her thumbs because no crystals are forming, even over an ice bath. Nora decides that Sophia’s problem is too much solvent. Determined not to have the same problem, Nora uses a minimal volume of hot solvent to dissolve her compound before doing the gravity filtration step. She begins to pour her hot solution into the filter cone of a long-stemmed funnel and ….is that missed impurities sprouting up on the funnel walls? Why so shiny? Explain what Nora did wrong and how to fix the problem.
Chemistry
1 answer:
Katarina [22]3 years ago
3 0

Answer:

Nora used a minimal volume of hot solvent, this hot mixture was filtered to remove insoluble impurities.  She had to perform a rapid filtration with a minimum of evaporation in a short-stemmed funnel previously heated in an oven, and provided with a pleated filter to increase the filtration rate, so in this way she prevented the product from crystallizing prematurely on the funnel stem.

If with this technique does not reach a pure substance, the process can be repeated by heating the solvent, changing the funnel or looking for a solvent with high dissolution power of the substance.

Explanation:

The solid products obtained in a reaction are usually accompanied by impurities that must be removed in order to dispose of the desired product in the highest possible purity. The most suitable method for removing impurities that contaminate a solid is by crystallization either in a pure solvent or in a mixture of solvents. This procedure is given the generic name of recrystallization.

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When the surface water temperature is still well below the water boiling temperature, some bubbles at the bottom tend to float u
irga5000 [103]

Answer:

The reasons why the seemingly floating bubbles disappear was that they tend to loss their latent heat to the water molecules at the surface water.

Explanation:

Heat energy has a considerable effect on the velocity of molecules including water. The water molecules below the container will receive much more heat energy than those above it. This heat energy in the form of specific heat capacity and latent heat that result in the increase in the speed of individual molecules of water and finally to the escape of the molecules to a colder region of the container, in this case the upper region. At the collision of the bottom water to the surface water, they tend to exchange their heat content, the hotter molecules will lose their heat to the cold ones. When the formerly hot molecules encounter this, it will result in lowering the temperature and consequentially to the reduction of their movement, once in the form of bubble, now become ordinary water. This convectional transfer of heat energy will continue until the whole system has a uniform temperature depending on the consistency of the heat source.

7 0
3 years ago
The best tool to use to locate the boundaries between countries is a(n) _____.
8_murik_8 [283]

The correct answer is (b) political map

The explanation:

when a political map: is different than other types of maps because it focuses on government or administrative boundaries rather than geographical or physical features. Instead of showing viewers what exists in the land, it shows those imaginary lines that serve to separate countries, states, territories, and cities. These maps generally include larger bodies of water, such as oceans, rivers, and lakes, as landmarks.

It was made by man not natural like the others maps.

so this is the correct answer.

8 0
3 years ago
Where is DNA found?
Katarina [22]
The DNA is found in the golgi
7 0
3 years ago
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Two colorless solutions are mixed together bubbles form as the solution is stirred give to possible explanations for this result
Aleks [24]
One possible answer could be that a chemical reaction has occurred.
5 0
3 years ago
Sort the examples based on whether they describe a physical change or a chemical reaction. growth of a seed into a seedling tarn
Pepsi [2]

Answer: I did the research myself since I couldn’t find the answers.

Physical change:

Wax melting from applied heat

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Adding copper with gold to make jewelry

Chemical Reaction:

Growth of a seed into a seedling

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Tarnishing of silver

Explanation:

Thanks google

4 0
3 years ago
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