Half-reactions are important in redox reactions.

Grignard reactions are commonly used in organic synthesis.

Pericyclic reactions are important in organic chemistry.

Chain reactions can have a significant impact on the outcome of a chemical reaction.

My gut reactions told me not to trust him.

Photochemical reactions play a crucial role in the process of photosynthesis.

Photonuclear reactions are important in nuclear physics.

Thermite reactions are highly exothermic chemical reactions.

Arthus reactions can occur after exposure to certain antigens.

The patient developed multiple id reactions after being exposed to the allergen.