Students in science class watched as their teacher demonstrated various changes. Picture A. shows a strip of magnesium ribbon, a
silver metal, in a test tube of hydrochloric acid. Bubbles are forming as the metal ribbon disappears. Also, the test tube feels warmer. Picture B. shows a container of water being heated and bubbles forming as the water bubbles. Which picture illustrates a chemical change? Explain.
A) Picture A. The magnesium ribbon disappears.
B) Picture A. Gas bubbles are produced and there is a temperature change.
C) Picture B. Bubbles are being produced as the water is being heated on the burner.
D) Picture B. There is a change in temperature as the water begins to boil and bubbles are being produced.
A) Picture A. The magnesium ribbon disappears.
B) Picture A. Gas bubbles are produced and there is a temperature change.
C) Picture B. Bubbles are being produced as the water is being heated on the burner.
D) Picture B. There is a change in temperature as the water begins to boil and bubbles are being produced.
2 answers:
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Solution :
According to Chick's law
where, t = contact time
c = concentration of disinfectant
k' = lethality coefficient = 4.71
n = dilution coefficient = 1
4 log removal = % removal = 99.99
= 1 - R
= 1 - 0.9999
Now for plug flow reactor contact time,
= 0.01875 days
= 27 minutes
For CSTR,
days
= 5.4 minute
There are 3 reactors, hence total contact time = 3 x 5.4
= 16.2 minute
Or
or
∴ C x t = 1.955
For PFR, min
∴ C = 0.072 mg/L
For CSIR, min
mg/L
∴ Chlorine required for PFR in kg/day
(1 gallon = 3.785 L)
= 18.25 kg/day
Therefore we should go for PFR system.
Answer:
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