How is an endothermic reaction identified in an equation?
Well, how is an exothermic reaction represented?
We use the symbol
And an example of spontaneous endothermic change...the which will probably be demonstrated in your lab..
The two solids are mixed, and we get a slurry of barium salt, a whiff of ammonia gas, and the sides of the flask ice up as the entropy-driven reaction extracts heat from the surroundings...