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Oliga [24]
2 years ago
14

50 POINTS!!!!!!!!!

Chemistry
1 answer:
nevsk [136]2 years ago
7 0

1. Balloon will expand.

This is because when the temperature is higher, the particles of matter gain more heat energy, this heat energy is converted into the kinetic energy of particles. So, they move more rapidly in all directions, increasing the volume.

2. Balloon will contract.

This is because when the temperature is lower, the particles of matter lose more heat energy to their surroundings, this heat energy is converted from the kinetic energy of particles. It means they lose kinetic energy. So, they move less rapidly in all directions, decreasing the volume.

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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.

3 0
3 years ago
Name two unique properties of water
arsen [322]
Water's high polarity
Water's attraction to other polar molecules
I hope this works!!
7 0
2 years ago
A molecular compound is found to consist of30.4% nitrogen and 69.6% oxygen. Ifthe molecule contains 2 atoms of nitrogen, what is
Ostrovityanka [42]

Answer:

92.01 g/mol

Explanation:

So first you need to find the empirical formula by the percents. That would be, assuming that you have 100 grams of the the sample, divide each quantity of each element found by its respective molar mass.

30.4 g of N ÷ 14 g/mol N= 2.17 mol of N

69.6 g of O ÷ 16g/mol= 4.35 mol of O

You can establish now the empirical formula.

N2.17O4.35,

but since you can't have a decimal subscript, you divide each subscript by the minimum subscript

NO2

So then you're said that the molecular formula derived from that empirical formula has 2 nitrogen, so you multiply all the subscripts, by 2:

N2O4

-Dinitrogen Tetraoxide

-Nitrogen oxide (IV)

Then all you have to do is find the molecular mass of the compound using the periodic table and what you obtain is the molar mass.

remember: molecular mass is correspondent to molar mass.

3 0
2 years ago
Which of the following is a characteristic of<br> a salt?
alexdok [17]

Answer:

Salts can be several different colors and may be any of the five tastes, including salty, sweet, bitter, sour or savory. Their odor depends on the acid and base it is comprised of. Salts comprised of strong acids and bases, called strong salts, are odorless.

8 0
3 years ago
Read 2 more answers
Which of the following elements is a metalloid
klemol [59]
A metalloid can be:
 - Boron (B)
 - Silicon (Si)
 - Germanium ( Ge)
 - Arsenic (As) 
 - Antimony ( Sb)
 - Tellurium (Te)
 - Polonium (Po)

Hope this helps :)
6 0
3 years ago
Read 2 more answers
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