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ale4655 [162]
3 years ago
14

If the half-life of a radioisotope is 20,000 years, then a sample in which three-quarters of that radioisotope has decayed is __

_________ years old
Chemistry
1 answer:
poizon [28]3 years ago
4 0
25% remaining = 40,000 years old
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How do particles in a solid move?
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The particles in a solid vibrate in place.

Explanation:

The particles in a solid are close and tightly packed together so they have no room to flow past each other like the particles in a liquid can.

Hope this helps!

8 0
4 years ago
The maximum number of electrons in a p sub-level is:
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A p sub- level has 3 sub levels so it contains 6 electrons max 
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The number of un paired electrons in the outer subshell of a cl atom is
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1 is the number of unpaired electrons in the outer subshell of a Cl atom
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at 55 years what mass remains of a 200.0 g sample of a radioactive isotope with a half life of 10.0 years
Harman [31]

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4.419 g

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3 0
1 year ago
A pure white crystalline compound was found to melt at 112.5-113.0oC when taken on a melting point apparatus, and on further hea
Sergeeva-Olga [200]

According to the question, the determined melting point of the compound is 112.5-113.0oC. When the solidified compound was retried, the melting point was found to be 133.6-154.5oC. This greater range higher than  112°C is caused by reusing samples leads to errors.

A pure sample is known by its sharp melting point. A pure sample does not melt over a large range. We can see this in the predetermined melting points of the pure sample(112.5-113.0oC).

However, reusing a sample introduces errors because the pure sample may become contaminated leading to a larger and higher range of melting point (133.6-154.5oC) which is far above  112°C.

Learn more: brainly.com/question/5325004

8 0
3 years ago
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