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3 years ago

Write the merits and demerits of Mendeleev periodic table in points and explain each of them in short

Chemistry

1 answer:

elena-14-01-66 [18.8K]3 years ago

6 0

Answer:

merits of mendeleev periodic table are:

it was first scientific and systamatic study of different element.
there were may gaps for in discovered elements.After their discovery the got their proper place in table.
with the help of mendeleev periodic table , properties of several elements were studied correctly.

demerits of mendeleev periodic table

it could not arrange hydrogen as it shows the property of both alkali and halogens.
it could not arrange isotopes because they have different atomic weight but same atomic number.
it could not arrange Lanthanides and Actinides.

hope these points helped you

need more points then comment it .

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Hope this helps

Explanation:

3 0

3 years ago

You have a 0.7 M solution. Your job is to produce 50 mL of a 0.4 M solution.

Andreyy89

Answer: A. 28.6 ml of the 0.7 M solution we need to start with.

B. There are 0.02 moles of solute were in the 0.7 M solution.

C. Amount of water to be added is 21.4 ml

D. The resulting solution will have concentration of 0.28 M

Explanation:

According to the dilution law,

$M_1V_1=M_2V_2$

where,

$M_1$ = molarity of stock solution = 0.7 M

$V_1$ = volume of stock solution = ?

$M_1$ = molarity of diluted solution = 0.4 M

$V_1$ = volume of diluted solution = 50 ml

Putting in the values we get:

$0.7\times V_1=0.4\times 50$

$V_1=28.6ml$

A. 28.6 ml of the 0.7 M solution we need to start with.

B. Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.

$Molarity=\frac{n\times 1000}{V_s}$

where,

n = moles of solute

$V_s$ = volume of solution in ml

$0.7=\frac{n\times 1000}{28.6}$

$n=0.02$

Thus there are 0.02 moles of solute were in the 0.7 M solution.

C. Amount of water to be added = (50-28.6 ) ml = 21.4 ml

D. If water added is $2\times 21.4=42.8 ml$

$0.7\times 28.6=M_2\times 71.4$

$M_2=0.28M$

If volume of concentrated solution will be more , the resulting solution will have lesser concentration of 0.28 M

8 0

3 years ago

Which of these best show a physical change?

Angelina_Jolie [31]

Answer:

Explanation:

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3 years ago

After adding 20.0 mL of 5% NaOH solution into the remaining organic layer, followed by mixing and venting, the solution separate

Arisa [49]

Answer:

Explanation:

The objective of this experiment is to match the expected result with each of the propositions given after the experiment had been carried out.

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2. 9-fluorenone was most soluble in the organic layer. This is so as a result of its non-polar carbon structure.

3. Deprotonated chloroanilic acid was most soluble in the aqueous layer as a result of the formation of an electrovalent bond with water.

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5. The organic layer was a yellow colored solution.

6. The aqueous layer turned into a pink colored solution.

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3 years ago

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finlep [7]

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3 years ago

Write the merits and demerits of Mendeleev periodic table in points and explain each of them in short​

Write the merits and demerits of Mendeleev periodic table in points and explain each of them in short