3 years ago

What effects do melatonin’s have

1 answer:

nataly862011 [7]3 years ago

7 0

Answer: Melatonin has been used safely for up to 2 years in some people. However, it can cause some side effects including headache, short-term feelings of depression, daytime sleepiness, dizziness, stomach cramps, and irritability. Do not drive or use machinery for four to five hours after taking melatonin.

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radioisotope actinium 225 has half life of 10 days, I begin with 16 kg of this isotope, how much will remain after 40 days?

Igoryamba

$N(t)=N_{0}(\frac{1}{2})^\frac{t}{\tau_{_\frac{1}{2}}}}\\\\
N_{0}=16kg\\
t=40days\\
\tau_{_\frac{1}{2}}}=10days\\\\\\
N(t)=16kg*(\frac{1}{2})^{\frac{40}{10}}=16kg*\frac{1}{16}=1kg$

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3 years ago

In chemistry, what varies with the number of molecules present in a sample of a particular substance?

Neko [114]

Answer: concentration

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Concentration refers to the amount of a substance present in a sample. The more molecules of a substance present in a sample, the greater its concentration. The less molecules of a substance in a sample, the lesser the concentration. We are often concerned about analytically determining the concentration of a substance using diverse analytical methods in chemistry.

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Is classified as a substance <br><br> A. Elements and compound <br><br> B.mixtures

Vika [28.1K]

Pretty sure it’s Mixture if I’m not wrong

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Enter a range of values for x, 2x+10, 14

PIT_PIT [208]

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