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3 years ago

URGENT PLEASE HELP!!

Chemistry

1 answer:

Orlov [11]3 years ago

3 0

Answer:

Liters per second is 0.2 LPS

Liters per hour is 720

Explanation:

Divide the litres by the time, than multiply the time of an hour (in seconds) and than multiply the lps by time of an hour in seconds.

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50 J of work was done on a system, as a result of which 29 J of heat energy was removed from it. How would this affect the inter

alexandr402 [8]

Answer:

Work done=50J

Heat removed=29J

Now

$\\ \sf\longmapsto \Delta E=-50+29$

$\\ \sf\longmapsto \Delta E=-21J$

Hence the internal energy would decrease by 21J

Option B is correct

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3 years ago

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Aleksandr-060686 [28]

Answer:

As a pyramid gets taller, it gets smaller. In the Linnaean classification system, this happens as well, with each category growing smaller.

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3 years ago

Explain how heat transfer affects weather.<br> PLEASE HELP MEEEE

rusak2 [61]

When there is a transfer of heat a wind usually blows from where the heat is transferred from

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The dilution factor D for an unseeded mixture of wastewater is 0.05. The DO of the mixture is initially 8.0 mg/L, and after 5 da

enyata [817]

Answer:

(i) 5-day BOD of the waste is 120 mg/l.

(ii) The ultimate carbonaceous BOD (Lo) is 20 mg/l.

Explanation:

The dilution factor D is 0.05.

The initial DO is 8.0 mg/L and the DO after 5 days is 2.0 mg/L.

The BOD of the waste for an unseeded mixture is

$BOD_5=(DO_5-DO_0)/D=(8-2)/0.05=6/0.05=120mg/l$

The ultimate carbonaceous BOD (Lo) can be calculated as

$L = L_o*10 ^{- k_1t} \\L_o=L/10^{- k_1t}=2/10^{- 0.2*5}=2/10^{- 1}=2*10=20mg/l$

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3 years ago

What would be the mass of a sample containing 0.700 moles of pure tungsten?

kap26 [50]

We must first find the molar weight of Tungsten, found on the periodic table as 183.84g per mole.

We are told to find the mass of a sample containing 0.700 moles of Tungsten, so we can set this up in a multiplication equation and cancel units to find the mass in grams:

$\frac{183.84g}{1mol} * \frac{0.700mol}{1} =128.688g$

So the answer that is closest to this value is C) 129g.

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3 years ago