You work as a volunteer at the local science museum. You are asked to design an exhibit that
compares the size of a lithium atom to the size of
its nucleus. A lithium atom has a diameter of about
3 X 102 picometers. The nucleus of a lithium atom
has a diameter of about 5 X 10-3 picometers.
There are a trillion (10^12) picometers in a meter.

State the problem in your own words. What decisions will you need to make before you can proceed?

he uptake of drugs from the intestine is often strongly influenced by diffusion. for example, consider a water-insoluble steroid for treating inflammation that is solubilized in aggregates of detergent molecules, called micelles. these micelles, aggregates of 80 soap molecules, have a molecular weight of 24,000, a diameter of 2.6 nm, and a charge of -27. the positively charge ions (counterions) in this system are na".

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