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timofeeve [1]
3 years ago
15

A 60.0-g sample of fermium-253 was placed in a sealed vessel 9.0 days ago. Only 7.5 g of this isotope is now left. What is th

Chemistry
1 answer:
Alex787 [66]3 years ago
3 0

Answer:

A

Explanation:

3 days later: 60/2=30

6 days later: 30/2=15

9 days later: 15/2=7.5

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3 0
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Describe how you could use two LB/agar plates, some E. coli, and some ampicillin to determine how E. coli cells are affected by
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Answer:

For this experiment we are going to take plate 1 as the control plate, so, in it there will be just E. coli in LB/agar; in plate 2, we are going to put E. coli in LB/agar and some ampicillin.  Then, we have to wait for the E. coli colonies to form. After a while, the E. coli growth can be compared on both plates and determine if ampicillin affects or not the E. coli colonies.

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8 0
3 years ago
Consider the process of diluting 1.2 M NH4Cl solution to prepare 1.4 L of a 0.25 M NH4Cl solution. Determine if each of the foll
stepan [7]

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The mole number of the solute remain constant

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8 0
3 years ago
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