| A | B |
|---|
| Exothermic reaction, energy of bonds of products is... | less than energy of bonds in reactants |
| kJ on reactant side | endothermic reaction |
| standard conditions for thermochemical reactions | 25 degrees Celsius, 1 atm |
| endothermic reactions __________ heat | absorb |
| reaction rate | number/time |
| catalyst works by | lowering activation energy |
| smaller particle size increases ____________ | collisions |
| temperature increases ___________ and ____________ | energy and collistions |
| the energy needed for reactants to make products | activation energy |
| activated complex | transition state |
| standard heat of formation for free elemetns | zero |
| delta H = | products minus reactants |
| a catalyst in a reaction is | unchanged |
| delta H for an endothermic reaction is | positive |
| delta H for an exothermic reaction is | negative |
