A. Molecules in the surroundings transfer kinetic energy when they collide with molecules in the system.
B. Molecules in the system absorb energy when they move to the
surroundings.
C. Molecules in the system absorb energy when they collide with
molecules from the surroundings.
D. Molecules in the system transfer kinetic energy when they collide
with molecules in the surroundings.

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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