Question

give 2 examples of changes in which the energy is given out ​

Answer 1

Hey mate here your answer is

Example :

when liquid water becomes ice

when dry ice cube melts

HOPE THIS HELPS YOU FRIEND!!

Answer 2

reletion reactions is when a chemical reaction absorbs more energy than it releases. You are already familiar with enthalpy: melting ice is endothermic and freezing water is exothermic. When methane burns in air the heat given off equals the decrease in enthalpy that occurs as the reactants are converted to products.