Professor merrick conducts an experiment and finds that people in a good mood tend to remember happy events they have experienced whereas people in a bad mood tend to remember unpleasant events they have experienced. this finding is most consistent with the:

This finding is MOST consistent with the phenomenon called mood congruence. This suggests the notion that moods stimulate thoughts or memories that fit with the same emotion. Mood congruence works both for old and new memories, but it was stated that people are better at remembering childhood memories which match their current mood.

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explanation:

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds