A Level Science Kerboodle Chemistry Practical

TL;DR

Alcohols used in calorimetry experiment to calculate enthalpy change of combustion with spirit burner.

Transcript

[Applause] alcohol's can be used as a fuel in a spirit burner the heat released upon combustion of an alcohol can be measured by a simple calorimetry experiment and used to calculate the enthalpy change of combustion of the fuel to measure the enthalpy change of combustion set up the equipment as shown here so the first thing that we need to do is ... Read More

Key Insights

• 💱 Calorimetry experiments with alcohols measure enthalpy change of combustion.
• 🥵 Copper calorimeter minimizes heat loss for accurate measurements.
• 🔥 Quick extinguishing of spirit burner prevents further burning for precise results.
• 🦻 Using different alcohols aids in comparing energy content.
• 💦 Experiment involves calculating moles of fuel burned and energy change of water.
• ❓ Importance of accurate measurement in repeatable experiments.
• 🥵 Heat shield used to minimize heat loss during the experiment.

Questions & Answers

Q: How is alcohol used in a calorimetry experiment?

Alcohols are burned in a spirit burner to measure the heat released, which is then used to calculate the enthalpy change of combustion. This provides insights into the energy content of different alcohols.

Q: Why is copper calorimeter chosen for the experiment?

Copper is chosen for the calorimeter as it conducts heat well, minimizing heat loss to the surroundings. This ensures more accurate measurements of the enthalpy change of combustion.

Q: Why is it important to extinguish the spirit burner quickly?

Extinguishing the spirit burner quickly by placing the lid over the flame excludes oxygen to prevent further burning. This step ensures accurate measurement of the mass of alcohol burned.

Q: How does using different alcohols in the experiment help with comparison?

Using multiple alcohols like methanol, ethanol, butanol, and propanol allows for comparison of their energy content. This helps in understanding how the size of the alcohol molecule affects energy release.

Summary & Key Takeaways

• Alcohol fuels used in calorimetry to calculate enthalpy change of combustion.

• Set up equipment with water, copper calorimeter, and spirit burner for accurate measurements.

• Experiment involves heating alcohol, measuring temperature change, and calculating energy change and moles of fuel burned.