Problem: For (a) and (b), give the sign of _H, whether the reaction is exo- or endothermic and draw an enthalpy diagram for each.
17
Plan: See if heat is a ěproductî (exothermic; _H < 0) or a ěreactantî (endothermic; _H > 0). For exothermic reactions, reactants are above products in the enthalpy diagram.
Solution: (a) Heat is on the right (product), so _H< 0 and the reaction is exothermic.
Skill 6- 2 Drawing enthalpy diagrams for chemical and physical
changes
| Previous slide | Next slide | Back to first slide | View graphic version |