Her immediate reaction to the news was to call her family.

The reactional swelling after the vaccine was minor and subsided within two days.

The party's shift toward reactionism alarmed moderates, who feared a rollback of civil liberties.

The scientist recorded the subjects' reactions after administering the new drug.

Advanced students often study rearrangement reactions to understand how molecular frameworks change during synthesis.

Several reaction mixtures were left to equilibrate at room temperature before analysis.

The technician carefully cleaned the reaction vessels before starting the next experiment.

The engineer inspected the reaction turbines before the dam's seasonal opening.

In the lab, we observed several chemical reactions that produced unexpected color changes.

Biochemists often study redox reactions to understand cellular respiration and energy transfer.