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3 years ago

R777777777777777777777777777

Chemistry

2 answers:

777dan777 [17]3 years ago

8 0

Answer:

777777777777777777777777777

Explanation:

mestny [16]3 years ago

4 0

Thanks for the points

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If the lead concentration in water is 1 ppm, then we should be able to recover 1 mg of lead from _____ L of water.

Aliun [14]

Answer:

1 L

Explanation:

ppm means parts per million. Generally the relationship between mass and litre is given as;

1 ppm = 1 mg/L

This means that 1 ppm is equivalent to 1 mg of a substance dissolved in 1 L of water.

3 0

4 years ago

Suppose a current of is passed through an electroplating cell with an aqueous solution of agno3 in the cathode compartment for s

WARRIOR [948]

The given question is incomplete. The complete question is:

Suppose a current of 0.920 A is passed through an electroplating cell with an aqueous solution of agno3 in the cathode compartment for 47.0 seconds. Calculate the mass of pure silver deposited on a metal object made into the cathode of the cell.

Answer: 0.0484 g

Explanation:

$Q=I\times t$

where Q= quantity of electricity in coloumbs

I = current in amperes = 0.920 A

t= time in seconds = 47.0 sec

$Q=0.920A\times 47.0s=43.24C$

$AgNO_3\rightarrow Ag^++NO_3^-$

$Ag^++e^-\rightarrow Ag$

96500 Coloumb of electricity electrolyzes 1 mole of Ag

43.24 C of electricity deposits = $\frac{1}{96500}\times 43.24=0.00045moles$ of Ag

$\text{ mass of Ag}={\text{no of moles}\times {\text{Molar mass}}=0.00045mol\times 108g=0.0484g$

Thus the mass of pure silver deposited on a metal object made into the cathode of the cell is 0.0484 g

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3 years ago

What is true about most of the wavelengths found in the electromagnetic spectrum?

olasank [31]

D, you can't see ultraviolet rays and other similar frequency waves with the naked eye.

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What are Storm clouds? how are they different from other types of clouds?

goblinko [34]

Cumulus, stratus, and cirrus, there's many more but these are the main ones ^^

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ser-zykov [4K]

Answer:

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Explanation:

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