11. The converse is also true; the standard enthalpy of reaction will be positive for an endothermic reaction . 12. The test showed that the more plentiful lithium-7 also does so, albeit by an endothermic reaction . 13. :Bit of a guess ( maybe a soap expert will arrive soon ) : Saponification is an endothermic reaction . 14. Formation of petroleum occurs from hydrocarbon pyrolysis in a variety of mainly endothermic reactions at high temperature and / or pressure. 15. In the latter case, hydrates in the putty produce an endothermic reaction to mitigate heat transfer to the unexposed side. 16. For endothermic reactions , the type of surface determines the type of energy which is most effective in bringing about reaction. 17. All nuclear fusion reactions that produce heavier elements cause the star to lose energy and are said to be endothermic reactions . 18. The ? " H " is a positive change in endothermic reactions , and negative in heat-releasing exothermic processes. 19. Bromination favors the reactants because it is an endothermic reaction , which means that the reactants are lower in energy than the products. 20. On the other hand, in an endothermic reaction or system, energy is taken from the surroundings in the course of the reaction.
