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3.1.4.3 Applications Of Hess's Law

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Total cards: 8•Content version: v4•Public deck•Updated: 8/1/2026

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#1
Front (Question)

What is Hess’s Law?

Back (Answer)

The enthalpy change for a given reaction is independent of the route by which the reaction is achieved

#2
Front (Question)

What is the symbol for enthalpy change?

Back (Answer)

🔼Hr = enthalpy change 🔼Hr = 🔼H1 + 🔼H2

#3
Front (Question)

What are the symbols for endothermic and exothermic reactions?

Back (Answer)

-Ve = exothermic \+Ve = endothermic

#4
Front (Question)

What are the units for enthalpy change?

Back (Answer)

Kilojoules per mole

#5
Front (Question)

What is the enthalpy change of formation?

Back (Answer)

Arrows point upwards Reactants to products on top row Elements in their standard state on bottom row 🔼Hr = 🔼Hf (products) -🔼Hf (reactants)

#6
Front (Question)

What is the enthalpy change of combustion?

Back (Answer)

Arrows point down Reactants to products on top row Combustion products on bottom row 🔼Hr = +🔼Hc (reactants) - 🔼Hc (products) Multiply 🔼Hf / 🔼Hc by the number of moles in the equation

#7
Front (Question)

How do you use bond enthalpies to determine enthalpy change?

Back (Answer)

🔼Hr = positive bond enthalpies (reactants) + negative bond enthalpies (products)

#8
Front (Question)

How do you work out the enthalpy change in a reaction when given bond enthalpies?

Back (Answer)

• Draw the structure of the reaction • Total the number of bonds • Input the values of bonds • (Bond enthalpies of reactants) - (Bond enthalpies of products)