Question

if hot tea in a cup is exothermic reaction then why cup become cold​

Answer 1

Explanation:

If heat is given off, the reaction is exothermic. ... This is when a reaction starts colder and ends up hotter, taking in energy from start to finish. In an endothermic reaction, the system gains heat as the surroundings cool down. In an exothermic reaction, the system loses heat as the surroundings heat up.