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4 years ago

Why organic compounds recrystallized when produced

Chemistry

1 answer:

vazorg [7]4 years ago

6 0

Answer:

An impure compound is dissolved (the impurities must also be soluble in the solvent), to prepare a highly concentrated solution at a high temperature. ... The impure substance will crystallize in a purer form because the impurities won't crystallize yet, therefore leaving the impurities behind in the solution

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Why can't amylase digest other substances?

yuradex [85]

Explanation:

saliva contains and amylase which randomly hydrogen all the one is equal to 4 glycosidic bonds of stars except it's out most bones and those next the branches on the hand glycogen being a highly branched molecule it is evident that amylase won't be a good animal eyes to digest it due to physical structure constance

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2 years ago

What is the half-life of a first-order reaction if it takes 4.4 x 102 seconds for the concentration to decrease from 0.50 M to 0

elena55 [62]

Answer: The half-life of a first-order reaction is, $3.3\times 10^2s$

Explanation:

All the radioactive reactions follows first order kinetics.

Rate law expression for first order kinetics is given by the equation:

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

where,

k = rate constant = ?

t = time taken = 440 s

$[A_o]$ = initial amount of the reactant = 0.50 M

[A] = left amount = 0.20 M

Putting values in above equation, we get:

$k=\frac{2.303}{440s}\log\frac{0.50}{0.20}$

$k=2.083\times 10^{-3}s^{-1}$

The equation used to calculate half life for first order kinetics:

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

Putting values in this equation, we get:

$t_{1/2}=\frac{0.693}{2.083\times 10^{-3}s^{-1}}=332.69s=3.3\times 10^2s$

Therefore, the half-life of a first-order reaction is, $3.3\times 10^2s$

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3 years ago

What determines the velocity of an object? Its acceleration at a given point in time Its weight in a given location Its displace

tensa zangetsu [6.8K]

We can confirm that the velocity of an object is determined by the displacement of the object over a period of time.

<h3>How do we know that displacement and time determine velocity?</h3>

We know this by analyzing the scientific formulas created to measure the velocity of an object. The formula for this is $\frac{d}{t}$ , meaning displacement over a period of time. Since option 3 described this equation perfectly, we can say that this is the correct option.

Therefore, we can confirm that the velocity of an object is determined by the displacement of the object over a period of time.

To learn more about velocity visit:
brainly.com/question/18084516?referrer=searchResults
#SPJ1

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2 years ago

Calculate the rms speed of an oxygen gas molecule, o2, at 17.0 ∘c .

ludmilkaskok [199]

The RMS of O2 at 17 degrees is calculated as follows

RMs= ( 3RT/m)^1/2 where

R= ideal gas constant = 8.314
T= temperature= 17+273= 290 K
M= molar mass in KG = 32/1000= 0.032 Kg

Rms is therefore= sqrt (3x 8.314 x290/0.032 ) = sqrt( 226036.875

RMs=475.43

6 0

3 years ago

Read 2 more answers

Which order shows decreasing wavelength?

blagie [28]

Answer:

The answer is c radio --> infrared --> ultraviolet --> gamma

Explanation:

I just did it

4 0

3 years ago

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Why organic compounds recrystallized when produced​

Why organic compounds recrystallized when produced