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Gnoma [55]
2 years ago
5

Which distinguishes chemical changes from physical changes?

Chemistry
1 answer:
7nadin3 [17]2 years ago
7 0

Answer:

In a chemical reaction, there is a change in the composition of the substances; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition.

Explanation:

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You are requested to reduce the size of 50 ton/hr of a given solid. The size of the feed is such 80% passes a 4-in (76.2 mm) scr
defon

Answer:

1) The power needed to process 50 ton/hr is 135.4 HP.

2) The void fraction of the bed is 0.37.

Explanation:

1) For this type of milling operations, we can estimate the power needed for an operation according to the work index (Ei), the passing size of the circuit feed (F80) and the passing size of the product (P80).

We assume the units of Ei are kWh/t.

The equation that relates this parameters and the power is (size of particles in μm):

W=Ei*(\frac{10}{\sqrt{P80}} -\frac{10}{\sqrt{F80}} )\\\\W=9.45*(\frac{10}{\sqrt{3175\mu m}} -\frac{10}{\sqrt{76200mm}} )\\\\\\W=9.45*(0.1774+0.0362)=2.019 kWh/t

The power needed to process 50 ton/hor is

P=2.0194\frac{kWh}{Ton}*\frac{50Ton}{h}*\frac{1.341HP}{1kW}=   135.4 \, HP

2) The density of the packed bed can be expressed as

\rho=f_v*\rho_v+f_s*\rho_s

being f the fraction and ρ the density of every fraction. We know that the density of the void is 0 (ρv=0) and that fv=1-fs (the sum  of the fractions ois equal to the total space).

Then we can rearrange

\rho=f_v*\rho_v+f_s*\rho_s\\\\\rho=f_v*0+(1-f_v)*\rho_s\\\\\rho/\rho_s=1-f_v\\\\f_v=1-\rho/\rho_s=1-990/1570=1-0.63=0.37

The void fraction of the bed is 0.37.

6 0
3 years ago
Under which class of substitution reaction does this reaction appear to fall
liberstina [14]

This reaction is most likely to fall under SN2 because the thing called carbonication does not occur in SN1. The carbon forms a partial bond with the nucleophile during the intermediate phase and the leaving group. So for this question the reaction will fall under SN2.

3 0
3 years ago
Jeff has night vision goggles and can see people and animals even if it is pitch black outside. What type of electromagnetic wav
forsale [732]

Infrared radiation

Explanation:

The type of electromagnetic waves Jeff uses to make his goggles work are the infrared radiations.

Jeff is certainly using a night vision goggle to see in the dark . It senses infrared radiations

  • Infrared radiations are part of the electromagnetic spectrum.
  • Every hot objects gives off infrared radiations.
  • These googles have thermal imaging sensors that detects these radiations.
  • Naked eyes cannot see the radiations.
  • The heat emitted is a form of radiation called the infrared radiation.

learn more:

Electromagetic radiation brainly.com/question/6818046

#learnwithBrainly

7 0
3 years ago
who else has found that something they did or readed or whatever it is they had completely forgot about and just remembered abou
Dominik [7]

Answer:

Yes I do this a lot :)

Explanation:

6 0
2 years ago
How many moles is 2.17 x 10^ 23 representative particles of bromine?
Oksana_A [137]
It should be 2.7 mol if I"m correct
3 0
3 years ago
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