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astraxan [27]
3 years ago
15

If you drink at 2am can you pass a drug test at 6pm

Chemistry
2 answers:
-BARSIC- [3]3 years ago
5 0
No not at all  it will still be a little left in your system <span />
VikaD [51]3 years ago
3 0
Yeah...it should be out of your system by then
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Cobalt-60 is a strong gamma emitter that has a half- life of 5.26 yr. The co balt-60 in a radiotherapy unit must be replaced whe
Alenkasestr [34]

<u>Answer:</u> The sample of Cobalt-60 isotope must be replaced in January 2027

<u>Explanation:</u>

The equation used to calculate rate constant from given half life for first order kinetics:

t_{1/2}=\frac{0.693}{k}

where,

t_{1/2} = half life of the reaction = 5.26 years

Putting values in above equation, we get:

k=\frac{0.693}{5.26yrs}=0.132yrs^{-1}

Rate law expression for first order kinetics is given by the equation:

k=\frac{2.303}{t}\log\frac{[A_o]}{[A]}

where,

k = rate constant = 0.132yr^{-1}

t = time taken for decay process = ? yr

[A_o] = initial amount of the sample = 100 grams

[A] = amount left after decay process =  (100 - 75) = 25 grams

Putting values in above equation, we get:

0.132=\frac{2.303}{t}\log\frac{100}{25}\\\\t=10.5yrs

The original sample was purchased in June 2016

As, June is the 6th month of the year, which means the time period will be 2016+\frac{6}{12}=2016.5

Adding the time in the original time period, we get:

2016.5+10.5=2027

Hence, the sample of Cobalt-60 isotope must be replaced in January 2027

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3 years ago
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Write a CER to explain what happened to this styrofoam head. The pics are of the head above water, at a depth of 1000m underwate
statuscvo [17]

Answer:

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Explanation:

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DaniilM [7]

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lesya692 [45]
D= m/v
90.0/8.9
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2 years ago
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