If a substance has a half-life of 150 million years, what fraction of the atoms remain after 300 million years?
A. 1/8
B. 1/2
C. 1/4
D. 1/16

Which type of bonding involves the complete transfer of a valence electron from a less electrogrative atom to a more electronegative one

What is the molecular weight of copper

You are attempting to recrystallize a crude product mixture. you add the appropriate amount of hot solvent and are allowing the solution to slowly cool to room temperature. however, at room temperature no crystals have appeared, which of the following methods should be used to induce crystallization? choose all correct answers. a) place the flask in an ice bath. b) swirl the contents of the flask. c) add a small seed crystal of the desired product. d) scratch the inside of the glassware using a stir rod. it can be multiple choices