A layer of water just under a frog’s skin captures oxygen from air or water and delivers it to blood vessels at the skin’s surface. How might this function relate to the fact that frogs are very sensitive to environmental pollution?

With the largest atoms and the smallest number of valence electrons and with the smallest atoms and the greatest number of valence electrons are the most reactive. a. nonmetals; metals b. nonmetals; transition elements c. transition elements; metals d. metals; nonmetals

Which of the following substances is the most soluble in water? a. sodium chloride b. methane c. bromine d. carbon

How many formula units in 2.63 mols of nacl?