A two-component mixture containing a dicarboxylic acid and tricarboxylaic acid gave only one spot with a Rf value of 0.05 after using hexane as the developing solvent. Indicate what should be done to correct this problem.

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.

"hydrogen bonding is the attraction of h atoms in the water molecule (slight + charge) to o atoms in a neighboring water molecule (slight - charge); it is a weak interatomic force. but it is still strong enough to the water molecules "stick" together."