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qwelly [4]
2 years ago
13

The Statue of Liberty is made of copper metal. Copper metal has the physical property of being orange in color. Over years of be

ing exposed to moist air, the surface of the statue has begun to form a green coating. Is the green coating the product of a physical or chemical change? Explain how the green layer is formed.
Chemistry
2 answers:
snow_lady [41]2 years ago
6 0

Answer:

The statue is made of a metal called copper. Over time, the copper has gone through a chemical change. This is called a chemical reaction.

Explanation:

i dont think this will help...

svetoff [14.1K]2 years ago
3 0

Answer:

Chemical.

Explanation:

Pretty sure its chemical, due to it oxidising which is a chemical reaction.

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What is the concentration (in M) of a sample of the unknown dye with an absorbance of 0.25 at 542 nm?
Sladkaya [172]

Answer:

see explanation below

Explanation:

Question is incomplete, so in picture 1, you have a sample of this question with the missing data.

Now, in general terms, the absorbance of a substance can be calculated using the beer's law which is the following:

A = εlc

Where:

ε: molar absortivity

l: distance of the light in solution

c: concentration of solution

However, in this case, we have a plot line and a equation for this plot, so all we have to do is replace the given data into the equation and solve for x, which is the concentration.

the equation according to the plot is:

A = 15200c - 0.018

So solving for C for an absorbance of 0.25 is:

0.25 = 15200c - 0.018

0.25 + 0.018 = 15200c

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5 0
2 years ago
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Answer:

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Explanation:

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