Solutions for your questions are the following:
1. remaining amount is equal to:960 g : 100% = 30 g : xx = 30 g * 100% / 960 g
= 3.125%
= 0.03125
Now, we use this formula to calculate the number of half-lives:(1/2)ⁿ = x,
so,(1/2)ⁿ = 0.03125
to calculate n, use this equation:
n*log(1/2) = log(0.03125) n = log(0.03125)/log(1/2)
= log(0.03125)/log(0.5)
= -1.505/-0.301
n=5
Ifn = 5T = 15 min
Then
L = T/nL = 15 min/5
= 3 minutes
2. You should pick filtration. It is use to separate heterogeneous mixtures just like in the problem stated.
Linear.
This is because Fluorine has seven valence electrons, pairing the odd one out in the middle will solve this problem.
It can't be pyrimidal or bent as it doesn't have any lone (unpaired) valence electrons. It can't be a tettrahedral as there aren't four other elements. It couldn't be a planar as there isn't a total of four elements to pair with a central atom.
Hope this helps!
1.Kinetic
2.Kinetic
3.Nuclear
4.Energy
5.Potential
6.Eletrical
7.Potential
8.Work
9.Mechanical
10.Thermal
11.Work
12.Radiant
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