Which element is reduced in the reaction below?
Fe2+ + H+ + Cr2O72- → Fe3+ + Cr3+ + 
O
Definitions:
Dreaming
A series of thoughts, images, and sensations occurring in a person's mind during sleep, often associated with REM sleep stages.
Psychoanalytic Theory
A framework for understanding human behavior that emphasizes unconscious motives and conflicts originated by Sigmund Freud.
Dreaming
A series of thoughts, images, and sensations occurring in a person's mind during sleep.
Activation-synthesis Theory
A theory suggesting that dreams are the result of the brain's attempt to make sense of neural activity during sleep by synthesizing it with stored memories.
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