Which process moves molecules and has these traits? –moves from high concentration to low concentration
–moves from uneven distribution to even distribution
–can occur when there is no membrane

active transport in a cell
diffusion
osmosis
passive transport in a cell

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

Calculate the expected ph values of the buffer systems from the experiments (a,b,c,d), using the henderson- hasselbalch equation, ph-pka+log[a-]/[ha]. use for pka values carbonic acid= 6.37, and acetic acid= 4.75.

An atom of lithium (li) and an atom of chlorine (cl) engage in a chemical reaction. which correctly describes the structure of the resulting chemical compound? hint: consider the class of each element. the chemical compound will have a network structure. the chemical compound will have triple bonds. the chemical compound will have a ball-and-stick structure. the chemical compound will have double bonds.