Question #ed5f9

1 Answer
Jan 12, 2016

Answer:

Oxirreduction, or combustion.

Explanation:

Reactions of the type

#4M + O_2 rarr 2M_2O#
#2M + O_2 rarr 2MO#
#4M + 3O_2 rarr 2M_2O_3#

Where #M# is a metal are oxirreduction (or redox) reactions since the metals goes from having a #0# net charge to a positive one (it's being oxidized) whereas Oxygen goes from having a #0# net charge to #-2#, being reduced.

Which of the equations will happen, will depend on the metal. But reactions of this type can happen with other compounds, including, for example the combustion of coal

#C + O_2 rarr CO_2#

The combustion of hydrocarbons in general

#2C_xH_y + (4x+y)O_2 rarr 2xCO_2 + yH_2O#

(Whereas any present oxygen may or may not become oxygen gas, and nitrogen or sulfur will go to an oxide depending on the amount of oxygen available among other things).