Worksheet: Errors in Calorimetry

In this worksheet, we will practice determining the sources of error and the errors involved in calorimetric measurements.

Q1:

In a classroom experiment, a coffee-cup calorimeter, like the one below, was used to measure the energy released by the dissolution of calcium chloride in water.

Which of the following would improve the accuracy of the measurement?

  • AReplacing the Styrofoam cups with glass cups
  • BLifting the cover to check if all the solid has dissolved
  • CUsing the stirrer when adding the solid calcium chloride only
  • DUsing a better insulator than Styrofoam
  • EUsing a metal thermometer

Q2:

In a classroom experiment, a coffee-cup calorimeter, like the one below, was used to measure the energy released by the dissolution of calcium chloride in water.

Which of the following would reduce the accuracy of the measurement?

  • AUsing a small magnetic stirrer which sits entirely inside the liquid
  • BUsing a small remote thermometer that sits entirely inside the liquid
  • CMaking sure the water temperature matches the air temperature
  • DUsing a better insulator than Styrofoam
  • ELifting the cover to check if all the solid has dissolved

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