For a chromatogram, why do different substances move different distances with the solvent up the chromatograph paper

Determine the mass of fuel required for the expected energy consumption in the united states for the next ten years. energy use per person per year in the united states = 3.5 x 1011joules base calculations on current population of 310,000,000.

If 10.g of agno3 is available, what volume of 0.25 m agno3 can be prepared

How would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same