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.
The density of ice does not affect the melting rate. But, adding an object does affect the melt rate. The reason this is is because when there is an object, there is less to melt. Hence, affecting the melting rate.
