% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Other crossword clues for answer "REACTION"

REACTION
Response
Stimulus aftermath
Knee jerk, e.g.
Chem lab event
Feedback, for example
Chemical change.
Counter tendency.
Double take
Response to a stimulus
Button on a Facebook post
Chemical change, or rhenium + actinium + titanium + oxygen + nitrogen?
Something you may read on a [first word of 121 Across], or have from reading a [second word of 121 Across], or see by reading [full answer to 121 Across]
Change in a lab
Backlash, for example
Change in a beaker, e.g.