The following reaction shows the production of hydrogen gas from water. this chemical reaction should be classified as

2 h2o 2h2 + o2

1)synthesis
2)decomposition
3)single replacement
4)double displacement
5)neutralization

This chemical reaction should be classified as a decomposition type of reaction, as basically water is decomposed using appropriate methods, chemically to produce hydrogen gas and oxygen gas. Both elements are found within the molecular formula of water. A decomposition reaction is when a compound is degraded and or broke down to form elements and other small compounds that constitute or make up the original compound.

Particle exchange energy though elastic collision , hope this .

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.