A column is packed with silica gel, which is polar. When a mixture of benzene and acetonitrile mixture is loaded into the column and the column is run with hexane, two bands are observed. Which substance is in the lower band? Explain.

Scientists often deal with numbers that are either very large or very small. for example, the radius of the sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 × 10-4 millimeters. express each of these numbers in an alternate form.