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djyliett [7]
3 years ago
6

Why do you start with the least polar solvent/solvent mixture and progress to increasing polar solvent/solvent mixtures when elu

ting the ferrocene compounds from the column rather than starting with more polar solvent system and progressing to less polar solvents
Chemistry
1 answer:
gregori [183]3 years ago
4 0

Explanation:

Generally in normal phase column, inside the column silica gel present is in normal phase and it strongly reacts or combine with more polar ferrocene compounds. Whereas, less polar ferrocene compounds weakly interact with this silica gel.  

Hence, on starting with least polar solvent or solvent-mixture the less polar ferrocene compounds will tend to elute first of all because these will weakly interact with the silica gel. Therefore, readily able to move away from the gel.

On increasing the polarity of solvent or solvent mixture, more polar ferrocene compounds will start to elute first. As a result, on changing the solvent polarity we can (from least to more polar) it is possible to get pure products.

But if we start with more polar solvent at first then almost all of the ferrocene compounds will elute leading to poor separation from the column due to which you will end up having a mixture of ferrocene compounds.

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The half-life of a first-order reaction is 13 min. If the initial concentration of reactant is 0.13 M, it takes ________ min for
Zigmanuir [339]

Answer:

Therefore it takes 8.0 mins for it to decrease to 0.085 M

Explanation:

First order reaction: The rate of reaction is proportional to the concentration of reactant of power one is called first order reaction.

A→ product

Let the concentration of A = [A]

\textrm{rate of reaction}=-\frac{d[A]}{dt} =k[A]

k=\frac{2.303}{t} log\frac{[A_0]}{[A]}

[A₀] = initial concentration

[A]= final concentration

t= time

k= rate constant

Half life: Half life is time to reduce the concentration of reactant of its half.

t_{\frac{1}{2} }=\frac{0.693}{k}

Here t_{\frac{1}{2} }=0.13 min

k=\frac{0.693}{t_{\frac{1}{2}} }

\Rightarrow k=\frac{0.693}{13 }

To find the time takes for it to decrease to 0.085 we use the below equation

k=\frac{2.303}{t} log\frac{[A_0]}{[A]}

\Rightarrow t=\frac{2.303}{k} log\frac{[A_0]}{[A]}

Here ,   k=\frac{0.693}{13 },  [A₀] = 0.13 m and [ A] = 0.085 M

t=\frac{2.303}{\frac{0.693}{13} } log(\frac{0.13}{0.085})

\Rightarrow t= 7.97\approx 8.0

Therefore it takes 8.0 mins for it to decrease to 0.085 M

7 0
3 years ago
Which components make up bronfenbrenner's ecological theory?(choose every correct answer.)
kari74 [83]

Which components make up bronfenbrenner's ecological theory?

Bronfenbrenner divided the person's environment into five different systems:

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What is bronfenbrenner's ecological theory?

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To know more about bronfenbrenner's ecological theory, refer:

brainly.com/question/15462995

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7 0
1 year ago
When atoms join together, the bond is either covalwnt or ionic
krek1111 [17]

it is a covalent bond


5 0
3 years ago
The pressure of a gas is 100.0 kPa and its volume is 500.0 mL. If the volume increases to 1,000.0 mL, what is the new pressure o
elena-14-01-66 [18.8K]

Answer:

P_2=50kPa

Explanation:

Hello,

In this case, we can apply the Boyle's law in order to understand the pressure-volume relationship as an inversely proportional relationship relating the initial and the final volume:

P_1V_1=P_2V_2

Next, we compute the final pressure P2:

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Thus we validate, the higher the volume the lower the pressure.

Best regards.

3 0
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andrew11 [14]

Answer: Examples of pure substances include iron, aluminum, silver, and gold. Mixtures: Substances that have two or more different particles are mixtures. Examples of mixture include the salt solution which is a 'mixture' of two components, salt, and water.

Explanation:

6 0
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