Hess's Law

Pregunta	Respuesta
Define Standard enthalpy change of formation	The enthalpy change when one mole of a pure substance is formed from its elements in their normal physical states under RTP. (298K and 101.325 kPa)
Define Standard enthalpy change of combustion	The enthalpy change when one mole of a pure substance is completely burnt in sufficient oxygen under rtp. (298K and 101.325 kPa)
ΔH means	Total change in enthalpy
Define : Thermodynamics	The science of energy conversion involving heat and other forms of energy especially work.
What is the 1st law of thermodynamics?	Energy cannot be created nor destroyed
Image: enthalpy_change_form (image/jpg)	Standard enthalpy of formation. ΔH2 has to be reversed as does the value associated with this arrow.
Image: combust.gif (image/gif)	Enthalpy of combustion ΔH [products] arrow has to be reverse as does the val
What are the conditions of RTP?	298 Kelvin 101.325 kPa
Define activation energy	The minimum energy required to initiate a reaction.
How can the activation energy be reduced? How?	Use a catalyst Lowers the Ea of a reaction by utilising different reaction pathways

Resumen del Recurso

	Creado por Shell Wood hace casi 11 años