Question

which phrase best defines a redox reaction? (1 point)
a reaction in which electrons are transferred between different atoms
a reaction in which the number of oxygen atoms is reduced
a reaction in which electrons are released from the system

Explanation:

A redox reaction (reduction - oxidation reaction) is characterized by the transfer of electrons between different atoms. In such reactions, one atom undergoes oxidation (loses electrons) and another undergoes reduction (gains electrons). The option "a reaction in which the number of oxygen atoms is reduced" is too narrow as redox reactions are not just about oxygen. The option "a reaction in which electrons are released from the system" is incorrect because in redox reactions, electrons are transferred (both gained and lost, not just released).

Answer:

a reaction in which electrons are transferred between different atoms