Fossils of the same species of life forms have been found on continents that are now divided by oceans. In one to two sentences, explain how this could be possible if a supercontinent did not once exist.

What is the maximum number of electrons that an atomic orbital can contain?

Which of these conditions most likely produces an unstable isotope?

Achemistry student needs to standardize a fresh solution of sodium hydroxide. he carefully weighs out of oxalic acid , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in of distilled water. the student then titrates the oxalic acid solution with his sodium hydroxide solution. when the titration reaches the equivalence point, the student finds he has used of sodium hydroxide solution.calculate the molarity of the student's sodium hydroxide solution. be sure your answer has the correct number of significant digits.