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 into water.

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

  • AReplace the Styrofoam cups with glass cups
  • BUse a metal thermometer
  • CLifting the cover to check if all the solid has dissolved
  • DOnly using the stirrer when adding the solid calcium chloride
  • EUsing a better insulator than Styrofoam

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 into water.

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

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

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