Majority of reactions taking place at ordinary temperatures with ssH are

Explanation

The symbol in the original stem is the enthalpy change, which did not print cleanly in the paper. Reactions that proceed readily at ordinary temperature without a continuous supply of heat are overwhelmingly those that release energy, that is exothermic ones with a negative enthalpy change. Endothermic reactions generally need heating to be maintained, which is why combustion and neutralisation happen spontaneously while thermal decomposition does not.