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3 years ago

Out line the successive steps in the crystallization of an organic solid from a solvent and state the purpose of each operation.

Chemistry

1 answer:

Neporo4naja [7]3 years ago

8 0

Answer:

See explanation

Explanation:

Crystallization is a separation technique used to obtain pure crystals of a substance from an impure mixture of solid substances.

The impure solid is dissolved in an appropriate hot solvent. This hot solvent is able to effectively dissolve the solid. However, as the solution is allowed to cool, the pure solid separates out of the solution as crystals.

The solid is now filtered to obtain the pure solid. The solid is also washed and dried to remove any solvent contaminant.

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The net force on an object that is accelerating at a rate of 4 m/sec is 255 N. What is the mass of the object in kg?

aleksklad [387]

Answer:

Given - acc = 4 m/ s^2

Force = 255 N

To find = mass

Solution -

Using the formula,

$f = m \times a$

255 = Mass × 4

255 /4 = Mass

63.75 = Mass

1 N = kg m/s^2

63.75 kg = Mass

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iren2701 [21]

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3 years ago

Uranium-232 has a half-life of 68.8 years. After 344.0 years, how much uranium-232 will remain from a 100.0-g sample?

amm1812

Answer: 3.13 g

Explanation:

Radioactive decay follows first order kinetics.

Half-life of uranium-232 = 68.8 years

$\lambda =\frac{0.693}{t_{\frac{1}{2}}}=\frac{0.693}{68.8}= 0.010072674 year^{-1}$

$N=N_o\times e^{-\lambda t}$

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$\lambda$ = rate constant

t= time

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$N=100\times e^{- 0.010072674 years^{-1}\times 344 years}$

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3 years ago

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sertanlavr [38]

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Explanation:

https://www.publish.csiro.au/sr/pdf/SR9910717

This is where I gather some info.

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3 years ago