In the equation 2 H2 + O2 → 2 H2O, the H2 molecules are and the H2O molecules are .

Ans. : frostbite is when exposure to cold temperatures causes freezing to the skin or other tissues. it most commonly affects the hands, feet, and face. the longer areas are exposed to cold, typically the worse the frostbite. the water temperature used for rewarming a frostbitten part should be : (102 -105) f degrees.

Answerbonded to an amino group(nh2);