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3 years ago

The method by which the substances in a mixture are separated is called what?

Chemistry

1 answer:

yanalaym [24]3 years ago

8 0

Answer:

Filtration is a separation method used to separate out pure substances in mixtures comprised of particles some of which are large enough in size to be captured with a porous material.

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You are managing a city that needs to upgrade its disinfection basin at your 40 MGD surface water drinking water treatment plant

nignag [31]

Solution :

According to Chick's law

$\frac{N_t}{N_0}=e^{-k'C^n t}$

where, t = contact time

c = concentration of disinfectant

k' = lethality coefficient = 4.71

n = dilution coefficient = 1

4 log removal = % removal = 99.99

$\frac{N_t}{N_0}=\frac{\text{bacteria remaining}}{\text{bacteria initailly present}}$

= 1 - R

= 1 - 0.9999

Now for plug flow reactor contact time,

$\tau =\frac{V}{Q} =\frac{75000}{40 \times 10^6}$

= 0.01875 days

= 27 minutes

For CSTR, $\tau =\frac{V}{Q} =\frac{150000}{40 \times 10^6}$

$=3.75 \times 10^{-3}$ days

= 5.4 minute

There are 3 reactors, hence total contact time = 3 x 5.4

= 16.2 minute

Or $\frac{N_t}{N_0}=e^{-k'C^n t}$

or $(1-0.9999)=e^{-4.71 \times C \times t}$

∴ C x t = 1.955

For PFR, $t_1 = 27$ min

∴ C $=\frac{1.955}{27}$ = 0.072 mg/L

For CSIR, $t_2=16.2$ min

$C=\frac{1.955}{16.2} = 0.1206$ mg/L

∴ Chlorine required for PFR in kg/day

$=\frac{0.072 \times 40 \times 10^6 \times 3.785}{10^6}$ (1 gallon = 3.785 L)

= 18.25 kg/day

Therefore we should go for PFR system.

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3 years ago

The increase in the population of people living in urban areas will cause a decrease in urban sprawl.

Marina CMI [18]

This is false/ i know because i live in an urban area and it increases by human construction.

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Signs of a chemical change

dezoksy [38]

Answer: There are five signs of chemical change

Color Change
Production of an odor
Change of Temperature
Evolution of Gas (bubbles start to form)
Precipitate (starts to form a solid)

When these signs start to form you know chemical change is at work.

Hope this helps :)

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Classify HBr as a strong acid or a weak acid.<br><br><br> Strong Acid or Weak Acid?

IceJOKER [234]

HBr is a Strong acid

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When acids react with water, ions are released which then combine with water molecules to form .

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When acids react with water, H ions are released which then combine with water molecules to form H₃O⁺

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