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dem82 [27]
1 year ago
11

Unless otherwise instructed, you may use the periodic table in the Chemistry: Problems and Solutions

Chemistry
1 answer:
allsm [11]1 year ago
4 0

Answer:

i don't know this puetion at

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127) Thirty-six colonies grew in nutrient agar from 1.0 ml of undiluted sample in a standard plate count. How many cells were in
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Answer:

36

Explanation:

Since the sample was undiluted the number of colonies is the number that grew on the nutrient agar which is 36 colonies. If it was diluted for example let say 0.1 ml from a dilution in which 1 ml of the sample was added to 9 ml of water, and it grew  colonies then  0.1 ml  yielded  6 colonies, 1 ml of the diluted sample will yield 60 colonies and 10 ml will have 600 colonies and therefore the 1 ml undiluted sample will have 600 colonies.

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3 years ago
WILL MARK BRAINLY
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2 years ago
Which of the following statements is true for radioactive reactions:
sasho [114]

Answer:

d) Nucleus of the element does not change during the react

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The half life of Radon-222 is 3.8 days. If you have a 90.0g sample of Radon-222 in the lab, how much will be left after 19 days?
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Answer:

half lives passed=5

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sample left=2.8125g

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no. of half lives=total time/half life

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