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Energetics exam tips
Study Energetics with curriculum-aligned Exam Tips resources, practice links, and exam-focused support.
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exam tips
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Energetics
Exam tips
Double-check your signs
When applying Hess's law, ensure that you correctly apply the signs of enthalpy changes for reactions that are reversed.
A common error is to forget that reversing a reaction changes the sign of the enthalpy change, which can lead to incorrect final answers.
Show all steps in calculations
When calculating enthalpy changes, clearly show the governing relationship, substitution, units, and significant figures.
This ensures clarity in your working and helps to avoid losing marks for not showing your method.
Show all steps in calculations
When calculating enthalpy changes, clearly show the governing relationship, substitution, units, and significant figures.
This helps to avoid losing marks for not demonstrating your understanding of the calculation process.
Draw clear enthalpy cycles
When constructing enthalpy cycles, ensure that all enthalpy changes are clearly labeled with their signs and values.
A well-drawn cycle helps in visualizing the relationships between different enthalpy changes and reduces the likelihood of errors in calculations.
Show all calculations clearly
When calculating enthalpy changes, clearly show each step of your calculation, including the bond enthalpies used.
This helps to avoid mistakes and allows for partial credit if your final answer is incorrect.
Show all working in calculations
Always include the steps of your calculations, including the bond enthalpy values used.
This helps to ensure you receive partial credit for your method, even if the final answer is incorrect.
Show all steps in calculations
When calculating enthalpy changes, clearly show the bonds broken and formed, along with the energy values used.
This helps to avoid mistakes and allows for partial credit if the final answer is incorrect.
Show all calculations clearly
When calculating enthalpy changes, clearly show each step of your calculation, including the total bond enthalpies for both reactants and products.
This helps to avoid mistakes and allows for partial credit if the final answer is incorrect.