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bezimeni [28]
2 years ago
10

How is an echo formed?

Chemistry
2 answers:
mojhsa [17]2 years ago
5 0

Answer: B

Explanation: echos cannot be made from light waves so C and D are out, and sound waves cannot travel into a surface. Also echos is sound waves bouncing that’s why in an empty room without furniture there’s an echo.

Finger [1]2 years ago
3 0

Answer:

It is none. Echo is formed when sound waves hit a hard surface.

Explanation:

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How many grams of Br are in 335g of CaBr2
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The answer is 267.93 g

Molar mass of CaBr2 is the sum of atomic masses of Ca and Br:
Mr(CaBr2) = Ar(Ca) + 2Ar(Br)
Ar(Ca) = 40 g/mol
Ar(Br) = 79.9 g/mol
Mr(CaBr2) = 40 + 2 * 79.9 = 199.8 g/mol

The percentage of Br in CaBr2 is:
2Ar(Br) / Mr(CaBr2) * 100 = 2 * 79.9 / 199.8 * 100 = 79.98%

Now make a proportion:
x g in 79.98%
335 g in 100%
x : 79.98% = 335 g : 100%
x = 79.98% * 335 g : 100%
x = 267.93 g
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2 years ago
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