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Natali5045456 [20]

2 years ago

15

When silver coins are found in ancient shipwrecks,they are coated with a black crust. What question could you ask to help you de

cide whether the silver underwent a chemical change or a physical change? Explain.

1 answer:

leonid [27]2 years ago

8 0

It went under a physical change because it (1) changed color. (2) changed form.

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it takes 513 kj to remove a mole of electrons from the atoms at the surface of a piece of metal. how much energy does it take to

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Answer:

The right solution is " $8.5\times 10^{-19} \ joule$ ".

Explanation:

As we know,

1 mole electron = $6.023\times 10^{23} \ no. \ of \ electrons$

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= $513\times 1000 \ joule$

For single electron,

The amount of energy will be:

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= $8.5\times 10^{-19} \ joule$

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