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3 years ago

Why is refraction so important in eyeglasses.

1 answer:

7 0

It helps our eyes to see better. For example: If you can't read a book because you see that is blurry, you might need glasses to see it much clearer

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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

Which of the following sentences best describes what is shown in the above picture?

velikii [3]

Answer:

Cells of a multicellular organism

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3 years ago

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PLEASE HELP! NO LINKS! CHEMISTRY!

Bingel [31]

Answer:

Solution A is 1,000 times more acidic than Sol. B

Explanation:

for pH values we use scientific notation:

-log10 c (where c is the hydrogen ion concentration) is used to notate pH value (think of it as a unit)

ie:

10^-2 is sol A 10^-5 is sol B

5-2 is 3

10^-3 = 1000

there's a diff of 1,000 between the solutions.

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How many moles of gas does it take to occupy 120 L at a pressure of 233 kPa and a temperature of 340 K?

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A would be correct have a nice day.

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Which substance is a pure substance? <br> Cereal <br> Silver <br> Jelly bean <br> Shampoo

Tju [1.3M]

Silver?

Fun FACT : An apple, potato, and onion all taste the same if you eat them with your nose plugged

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