Year 12 Chemistry
Enthalpy changes
Exothermic and endothermic reactions, standard enthalpy changes, calorimetry, Hess law cycles and bond enthalpy calculations.
Enthalpy changes free practice
No timer and no account needed. Check each answer as you go, then read the explanation.
1. In a Hess cycle that uses enthalpy changes of combustion, the reactants and the products both burn to give the same combustion products. How do the arrows from the reactants and from the products point?
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