reaction

réaction

Ce qu’on fait, dit ou ressent en réponse à un événement.

En anglais simple : Something you do, say, or feel because something else has happened.

• His first reaction was to laugh.
• What was your reaction to the invitation?
• Their reactions showed how surprised they were.

Comment l'utiliser : reaction to something (Her reaction to the news surprised me.)

Synonymes : response

Expressions courantes : first reaction, immediate reaction, reaction to something, public reaction

réaction chimique

Transformation où des substances se combinent ou se décomposent pour former d’autres substances.

En anglais simple : A change in which substances join together or break apart to form different substances.

• The reaction produced a gas.
• Heat can speed up some reactions.
• We observed a reaction between the acid and the metal.

Comment l'utiliser : reaction between A and B (The reaction between the two chemicals produces heat.)

Synonymes : chemical reaction

Expressions courantes : chemical reaction, reaction with oxygen, reaction between substances