Which is the most soluble substance listed

How are isotopes of the same chemical element alike? how are they different?

From the choices provided below, list the reagent(s) in order that will react with cyclopentanone to form the compound shown below.

Polar bears give birth and hunt on sea ice. which of the following would polar bears survive during the melting of arctic ice? growing another layer of fur during summer migrate inland to search for different food sources staying put until the ice refreezes sticking to the usual diet of seals