Hess' Law (AQA A-Level Chemistry): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What does Hess' Law state about the total enthalpy change of a reaction?
What does Hess' Law state about the total enthalpy change of a reaction?
The same regardless of route taken
Which principle is Hess' Law based on?
Which principle is Hess' Law based on?
Energy conservation
If a reaction proceeds through multiple routes, what is true about ?
If a reaction proceeds through multiple routes, what is true about ?
will be identical
What conditions must be met for Hess' Law to apply?
What conditions must be met for Hess' Law to apply?
Initial and final conditions same
Why is Hess' Law useful in chemistry?
Why is Hess' Law useful in chemistry?
Calculates unmeasurable changes
What tool is used to connect different reaction routes when applying Hess' Law?
What tool is used to connect different reaction routes when applying Hess' Law?
Hess Cycle
In a Hess Cycle, what do the arrows represent?
In a Hess Cycle, what do the arrows represent?
Enthalpy changes for stages
What does the direction of arrows indicate in a Hess Cycle?
What does the direction of arrows indicate in a Hess Cycle?
Add or subtract values
How are enthalpy values treated for forward reactions in a Hess Cycle?
How are enthalpy values treated for forward reactions in a Hess Cycle?
Added
What types of processes are mentioned as intermediate steps in a Hess Cycle?
What types of processes are mentioned as intermediate steps in a Hess Cycle?
Formation or combustion