4. Energetics

Calorimetry — Quiz

Test your understanding of calorimetry with 5 practice questions.

Practice Questions

Question 1

In a bomb calorimetry experiment at 298 K, the reaction 2 H$_2$O$_2$(l) → 2 H$_2$O(l) + O$_2$(g) yields an internal energy change ΔU = −98.0 kJ. What is the reaction enthalpy change ΔH?

Question 2

During a coffee-cup calorimetry experiment, if a reaction produces CO$_2$ gas that escapes from the calorimeter, how is the measured enthalpy change ΔH affected?

Question 3

A 60.0 g metal sample at 90.0 °C is placed into 120.0 g of water at 20.0 °C in a calorimeter with heat capacity C_{cal} = 50.0 J/K. The final equilibrium temperature is 25.0 °C. What is the specific heat capacity c_m of the metal (in J/g·K)?

Question 4

In determining the specific heat capacity of a metal using a coffee-cup calorimeter, which experimental error would cause the calculated c_m to be lower than the true value?

Question 5

Which formula correctly gives the energy E supplied to a calorimeter by an electrical heater with voltage V, current I, and time t?