Chemical reactions occur when the bonds between reactant molecules are broken and new bonds are established and formed between product molecules, resulting in the formation of a new compound.
It's crucial to understand what is physical changes and chemical changes when talking about chemical reactions.
- A physical change primarily results in a change in the state of the material or substance, whereas;
- A chemical change primarily results in the formation of a newly formed compound wherein energy is either released or absorbed.
For a chemical reaction to occur it implies that a chemical change must encounter physical changes such as the production of heat, changes in color, etc.
From the given option, the digestion of food undergoes a chemical reaction because a huge amount of macromolecules are being digested and broken down into simpler molecules in the presence of enzymes.
Other options are physical changes occurring such as evaporation of rubbing alcohol, freezing of water e.t.c.
Therefore, we can conclude that the chemical reaction among the given options is: digestion of food
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