When separating a mixture by normal phase chromatography (column or thin-layer), why is better to change from less polar solvent to a more polar solvent rather than the opposite

Forests and meadows are often cut down to make way for farms or large number of new homes. what are some of the elements of ecosystems that are lost when plants in these areas are removed?

The continuous release of nuclear energy caused when one fission reaction triggered more nuclear reactions is a

Consider the following reaction at equilibrium. 2co2 (g) 2co (g) + o2 (g) h° = -514 kj le châtelier's principle predicts that the equilibrium partial pressure of co (g) can be maximized by carrying out the reaction a. at high temperature and high pressure b. at high temperature and low pressure c. at low temperature and low pressure d. at low temperature and high pressure e. in the presence of solid carbon