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slega [8]
3 years ago
14

Question 15

Chemistry
2 answers:
Rina8888 [55]3 years ago
6 0

Answer:

1.184 g

Explanation:

Natalka [10]3 years ago
3 0
Lmk if u need anything to be explained

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Calculate the percent activity of the radioactive isotope strontium-89 remaining after 5 half-lives.
maria [59]
The answer to this question would be: 3.125%

Half-life is the time needed for a radioactive molecule to decay half of its mass. In this case, the strontium-89 is already gone past 5 half lives. Then, the percentage of the mass left after 5 half-lives should be:
100%*(1/2^5)= 100%/32=3..125%
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3 years ago
QUESTION 7
Temka [501]

The student's test average is : 0.92

Total score obtained = 369

Number of tests = 4

Since Each test is exactly 100 points ;

The total score obtainable is (100 × 4) = 400

Average = score obtained / total score obtainable

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Average = 0.9225

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Learn more : brainly.com/question/9416487?referrer=searchResults

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3 years ago
What is the formula for calcium fluoride​
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Answer:

CaF_{2}

Explanation:

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7 0
3 years ago
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What is the strongest interparticle force in a sample of kr?
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Answer:
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3 years ago
The number of ions produced when a substance dissolves is always equal to the number of Adams in a chemical formula. What is inc
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One thing incorrect is that when dealing with a compound, such as H2SO4, that has 7 atoms in the chemical formula, the polyatomic ion SO4 doesn’t dissociate into one Sulfur and four Oxygens. SO4 stays and a PAI.
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