If a particular process is endothermic, the reverse process must be a (an) chemical change. exothermic process. endothermic process. isothermal process. none of the above

The correct answer is none of the above.

Explanation:

If a particular process is endothermic, there can be no assurance that the reverse process is exothermic, since some exothermic processes do not occur at certain pressures and temperatures. In general, the pressure and temperature conditions under which the reverse process is performed should be established.

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u i forgot the answer?

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.