Which best describes a chemical reaction?
the rearrangement of atoms by breaking and reforming chemical bonds
a reaction that absorbs heat from the surroundings
a reaction that releases heat to the surroundings
the rearrangement of molecules based on temperature and pressure
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The best description of a chemical reaction is the rearrangement of atoms by breaking and reforming chemical bonds. This means that in a chemical reaction, the atoms of the reactants are rearranged to form new compounds, while the total number of atoms remains the same.
To understand this concept, you can study the principles of chemical bonding and how atoms combine to form molecules. Chemical reactions involve the breaking of existing chemical bonds in the reactants and the formation of new bonds to produce new compounds called products. This rearrangement of atoms is often represented by chemical equations.
It's important to note that the other options mentioned, such as a reaction that absorbs heat or releases heat to the surroundings, are related to the energetics of the reaction rather than the actual rearrangement of atoms and bonds.