Exothermic Process

Process that gives off heat, transfers thermal energy from the system to the surroundings

Examples §

2H${}_2$ (g) + O${}_2$ (g) -> 2H${}_2$O (l) + energy

H${}_2$O (g) -> H${}_2$O (l) + energy

In an exothermic reaction:

• The reaction vessel warms
• Heat is evolved (released)
• Energy is released by the system
• q is negative