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Anna11 [10]
2 years ago
5

When chemical W is added to a liquid, the chemical breaks down into substances X, Y, and Z. It is not possible to break down sub

stances X, Y, and Z into simpler substances. What conclusion is supported by this evidence?
Chemistry
2 answers:
Salsk061 [2.6K]2 years ago
6 0

Answer:

223

Explanation:

12345 [234]2 years ago
5 0

X, Y, and Z are elements.

An element is the smallest part of a substance that can exist on its own and can not be broken down into smaller unit.

From the question, W was broken down to give X, Y, Z. All three substances can not be broken down by chemical means.

The fact that X, Y and Z can not be broken down by chemical means implies that they are elements.

Learn more: brainly.com/question/13516179

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The element lead (pb) consists of four naturally occurring isotopes with atomic masses 203.97302,205.97444,206.97587, n 207.9766
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The method of determining the most common isotope of lead is by determining the average atomic mass. The formula for determining the average atomic mass is:

average atomic mass = \Sigma {percent abundance}\times {atomic mass}

Substituting the values in the formula:

average atomic mass = \frac{{203.97302}\times {1.4}+{205.9744}\times {24.1}+{206.97587}\times {22.1}+{207.97663}\times {52.4}}{100}

average atomic mass = \frac{285.562228+4963.984004+4574.166727+10897.975412}{100}

average atomic mass = \frac{20721.688371}{100} = 207.22 amu

The most common isotope of lead is:

Lead - 207.22 amu

The atomic symbol of lead is Pb. The atomic number of Pb is 82.

So, the the most common isotope of lead can be written as:

_{207.22}^{82}Pb and Lead - 207.22 amu.

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