Democritus contributed to our understanding of the atom in which of the following ways?
1. he determined the mass of the electron.
2. he determined the charge-to-mass ratio for the electron.
3. he hypothesized that all substances can be broken down into a smallest part called the atom.
4. he discovered the proton.

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?

Imagine a small synthetic vesicle made from pure phospholipids enclosing an interior lumen containing 1 mm glucose and 1 mm sodium chloride. if the vesicle is placed in pure water, which of the following happens faster? a. na+ diffuses out. b. cl– diffuses out. c. h2o diffuses in. d. glucose diffuses out. e. sodium chloride diffuses out.

What can be done to make a solid solute dissolve faster in a liquid solvent?