What does a nuclear change involve? a.) a change in the structure of the nucleus. b.) melting or freezing. c.) interactions with electrons. d.) mixing different compounds together.

The correct answer is A.) A change in the structure of the nucleus.

Explanation:

A nuclear change differs from a chemical or physical change because, during this, the structure of the nucleus changes, and this leads to a change in the element, which does not occur in chemical changes that only involve electrons or in physical changes that only affect the form of substances. Moreover, nuclear changes can occur through processes such as fission that implies the nucleus dividing or fusion, in which different nuclei combine. According to this, a nuclear change involves "a change in the structure of the nucleus".

the reaction mixture contains some ammonia, plus a lot of unreacted nitrogen and hydrogen. the mixture is cooled and compressed, causing the ammonia gas to condense into a liquid. the liquefied ammonia is separated and removed. the unreacted nitrogen and hydrogen are then recycled back into the reactor .

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