Radon 222 has a half life of 4 days. if 16g of radon accumulates, how much is left in 20 days

Once similarity and one difference between a mixture of elements and a mixture of compounds

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

Why can water dissolve many ionic compounds