Question

a compound can be broken down into simpler substances by
a a physical process only
b a chemical process only
c either a physical or chemical process
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Explanation:

A compound is a pure substance composed of two or more different elements chemically combined. Physical processes like filtration, evaporation, or distillation can separate mixtures (not compounds). To break down a compound into simpler substances (elements or simpler compounds), a chemical process is needed. For example, water ($\ce{H2O}$) is a compound. It can be broken down into hydrogen ($\ce{H2}$) and oxygen ($\ce{O2}$) gases through electrolysis (a chemical process).

Answer:

B. a chemical process only