What must occur in a substance in order to determine a chemical property?

Answer;

-Change in the substance in presence of another;

Explanation;

-A chemical property can be determined only when a change in the substance occurs in the presence of another substance or when sufficient energy of some form is added to it.

-Chemical properties can be established by changing a substance's chemical identity, and are different from physical properties, which can be observed by viewing or touching a sample.

your answer is c) plasma

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nuclear fission produces elements that are heavier than helium.

the elements that are used in nuclear fission and their products are much heavier than helium.