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erik [133]
3 years ago
9

Which of the following is NOT proof of a chemical change

Physics
2 answers:
Blababa [14]3 years ago
4 0

Answer:

E

Explanation:

all are proof Eeeeeeeeeee

Zinaida [17]3 years ago
4 0

Answer:

E. ALL ARE PROOF

Explanation:

these are all examples of chemical changes

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A type of matter made up of a combination of elements is called a compound. for example table salt, is made up of two elements that by themselves are lethal but chemically combined cancel each other out there for becoming edible.
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Use the mass spectrum of europium to determine the atomic mass of europium. where the peak representing eu-151 has an exact mass
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Answer: The atomic mass of a Europium atom is 151.96445 amu.

From the given information:

Percent intensity is 91.61% of Europium atom of molecular weight 150.91986 amu.

Percent intensity is 100.00% of Europium atom of molecular weight 152.92138 amu.

Abundance of Eu-151 atom:

X_{Eu-151}=\frac{0.9161}{0.9161+1.000}=0.4781

Abundance of Eu-153 atom:

X_{Eu-153}=\frac{1.000}{0.9161+1.000}=0.5219

Atomic mass of Europium atom:

A=(X_{Eu-151}\times150.91986+X_{Eu-153}\times152.92138)amu\\A=(0.4781\times150.91986+0.5219\times152.92138)amu=151.96445 amu

Therefore, the atomic mass of a Europium atom is 151.96445 amu.

3 0
3 years ago
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What game most represents a wave
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Answer:

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Explanation:

?

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