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If some washing powder/solution is left over this can bleach the hair. That would be my only explanation for this phenomena.

density = mass / volume So 2,50g/ml of calcium chloride makes for 748mg = 0,748g 0,748g / 2.5g/ml = 0,2992 ml And for the cement it is the same 8,76x10^3 g and it is 2,71 cm^3 big. So per cm^3 that is 8,76/2.71 = 3.23 g/cm^3

density = mass / volume So 2,50g/ml of calcium chloride makes for 748mg = 0,748g 0,748g / 2.5g/ml = 0,2992 ml And for the cement it is the same 8,76x10^3 g and it is 2,71 cm^3 big. So per cm^3 that is 8,76/2.71 = 3.23 g/cm^3

density = mass / volume So 2,50g/ml of calcium chloride makes for 748mg = 0,748g 0,748g / 2.5g/ml = 0,2992 ml And for the cement it is the same 8,76x10^3 g and it is 2,71 cm^3 big. So per cm^3 that is 8,76/2.71 = 3.23 g/cm^3

I think it is fairly simple but I don't understand how the teacher got to this answer: L= 0,5m D = 0,2m Phi,out = Integral v(z) * pi *D*dz = pi*D integral (v/2L) * z *dz = (pi*D*v)/(2L) [1/2 z²] = ((pi*D*v)/(4))*L the question is about a tube which is porous, which has lengt L and diameter D...

Ideal for this is the free software symyx draw which formerly was called ISIS/draw. Just google it and you will find symyx/draw. It converts names to molecules and vice versa. And you can draw yourself.