Endothermic and Exothermic Reactions
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Define enthalpy
Enthalpy is the total energy present in the substance.
How to calculate change in enthalpy?
Enthalpy of products - enthalpy of reactants
Which reactions loses heat to its surroundings?
Exothermic reactions
Which reactions has a negative enthalpy value?
Exothermic reactions
Which reactions gain heat from its surroundings?
Endothermic reactions
Which reactions have a positive enthalpy value?
Endothermic reactions
Where would a negative enthalpy value be placed in a reaction (products or reactants)?
Products
Where would a positive enthalpy value be placed in a reaction (products or reactants)?
Reactants
Is bond breaking endothermic or exothermic? Explain.
Endothermic because it requires an input of energy
Is bond making endothermic or exothermic? Explain.
Exothermic because when bonds are formed it releases energy.
Draw an EXOTHERMIC energy diagram with activation energy labelled, transition state, products and reactants.
(search internet)
Draw an ENDOTHERMIC energy diagram with activation energy labelled, transition state, products and reactants.
(search internet)