D is incorrect it is not a compound.
ANSWER:
DISPLACEMENT IS THE SHORTEST PATH LENGTH COVERED BY AN OBJECT.
IT IS A VECTOR QUANTITY AS IT NEEDS BOTH DIRECTION AND MAGNITUDE TO MEASURE IT.
HOPE IT HELPS!!!
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Answer:
Potassium
Explanation:
In group one of the periodic table both the melting and the boiling points usually decrease down the group.
Now, down the group, it's lithium that comes first, then sodium, then potassium.
Thus, among the 3, potassium is furthermost down the group by virtue of the factor it has the highest atomic number.
Therefore, we can say that potassium has the lowest boiling point among the 3.
Answer:
The amount of drug left in his body at 7:00 pm is 315.7 mg.
Explanation:
First, we need to find the amount of drug in the body at 90 min by using the exponential decay equation:
![N_{t} = N_{0}e^{-\lambda t}](https://tex.z-dn.net/?f=%20N_%7Bt%7D%20%3D%20N_%7B0%7De%5E%7B-%5Clambda%20t%7D%20)
Where:
λ: is the decay constant = ![ln(2)/t_{1/2}](https://tex.z-dn.net/?f=ln%282%29%2Ft_%7B1%2F2%7D)
: is the half-life of the drug = 3.5 h
N(t): is the quantity of the drug at time t
N₀: is the initial quantity
After 90 min and before he takes the other 200 mg pill, we have:
![N_{t} = 200e^{-\frac{ln(2)}{3.5 h}*90 min*\frac{1 h}{60 min}} = 148.6 mg](https://tex.z-dn.net/?f=N_%7Bt%7D%20%3D%20200e%5E%7B-%5Cfrac%7Bln%282%29%7D%7B3.5%20h%7D%2A90%20min%2A%5Cfrac%7B1%20h%7D%7B60%20min%7D%7D%20%3D%20148.6%20mg)
Now, at 7:00 pm we have:
![t = 7:00 pm - (5:00 pm + 90 min) = 30 min](https://tex.z-dn.net/?f=t%20%3D%207%3A00%20pm%20-%20%285%3A00%20pm%20%2B%2090%20min%29%20%3D%2030%20min)
Therefore, the amount of drug left in his body at 7:00 pm is 315.7 mg (from an initial amount of 400 mg).
I hope it helps you!
Answer:
11.33
Explanation:
-log(2.3x10^-3) = 2.67
14-2.67
- Hope this helped! Let me know if you need a further explanation.