Use NaOH pellets which have not been exposed to the air. Burning fossil fuels produces most of the heat that we use in North America. For solid and liquid fossil fuels, compare their efficiency of heat production on the basis of kJ per mole and kJ per gram burned. Rewrite this equation using H notation for one mole of carbon dioxide product. A plateau in the heating curves of a liquid can indicate the boiling point of the liquid.
Energy is absorbed during an exothermic reaction.
The heat which makes hot weather originates in a nuclear reaction.