Energetics Flashcards
Exothermic reactions _ surrounding temperatures
Increase
Endothermic reactions _ surrounding temperatures
Decrease
Endothermic values are +/-?
+ positive
Exothermic values are -/+?
- negative
2 examples of Exothermic reactions
Combustion and Neutralisation reactions
2 examples of endothermic reactions
Thermal decomposition and photosynthesis
In a endothermic reaction diagram is the products higher or lower than reactants
Higher
In a Exothermic reaction diagram is the products higher or lower than reactants
Higher
Def Standard enthalpy of formation
The enthalpy change to make 1 mole of a compound when its from from its elements under standards states and conditions
How to work out Standard enthalpy of formation
Products - reactants
Def Standard enthalpy of Combustion
The enthalpy change when one mole of a compound is completely burnt in excess oxygen under standard states and conditions
How to work out Standard enthalpy of Combustion?
Reactants - products
Def Hess’s Law
The enthalpy change is the same no matter of the route taken
