The element copper with a relative atomic mass of 63.55 contains atoms of mass numbers 63 and 65. Calculate the fraction of each isotope.

Identify two types of chemical bonding in the source of dietary potassium

Melissa is interested in her family tree and how her family has changed over its many generations. melissa probably more closely resembles

Some liquids can be distilled, but only at temperatures that are so high that it is impractical, or so high the compound decomposes. explain why distillation such compounds at significantly less than atmospheric pressure (some degree of vacuum) would solve this problem.