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Which of the following statements best describes chemical reactions?

A. Chemical reactions involve the breaking and forming of bonds between atoms.
B. Chemical reactions occur only when catalysts are present.
C. Chemical reactions always produce a gas.
D. Chemical reactions require an input of heat.


Sagot :

Final answer:

Chemical reactions involve the rearrangement of atoms to form new substances.


Explanation:

Chemical reactions are processes by which substances react with each other to produce new substances. Reactants are the starting substances, and products are the ending substances. These reactions involve breaking and forming chemical bonds, resulting in rearrangement of atoms.


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