Oxidation
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Example:
Imagine leaving a slice of apple out on the counter, only to find it turning brown after a while. This browning process is similar to oxidation, where the apple's flesh reacts with oxygen in the air, much like how iron reacts with oxygen to form rust. Just as the apple's surface changes color due to exposure to oxygen, in oxidation, substances like iron combine with oxygen, leading to a transformation that we recognize as rusting.
Practice Version
Oxidation: A chemical change in which a substance combines with oxygen, like when iron forms rust, is called oxidation. Oxidation is when a material reacts with oxygen and changes, like an apple turning brown.