Sunday
April 26, 2015

Homework Help: chemistry

Posted by angel on Friday, March 9, 2007 at 4:14pm.

A drop of oil (volume 0.05cm3) is released from a medicine dropper on to the calm surface of a pond where it spreads out to cover an area of "40m2". Assume that the oil film has a uniform thickness equal to the diameter of a oil molecule.

Calculate the diameter of an oil molecule and express in Scientifc notation to an appropriate number of sig figs






volume = pi*r^2^thickness
volume = 0.05 cm^3
pi*r^2=area=40 cm^2
Calculate thickness.
Round to correct number of significant figures and change to scientific notation. Post your work if you get stuck.

I made a typo above on the first line.
It should be
volume = pi*r^2*thickness.
I believe everything else is ok.
Check my work.

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