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 Home > JCEDLib > QBank > Collection > CQs and ChPs > CQs > Types of CQs >
Types of Conceptual Questions (CQs): Demonstration Questions
Students answer questions having observed a demonstration, video, or simulation.
Example of Demonstration Question

(The tests in the following question were presented as a demonstration question on an hour examination.)

Four colorless liquids, I, II, III, and IV, could be water, a 1 M solution of an acid, a solution of a buffer, or a 1 M solution of a base. 25 mL of each unknown was added to a different test tube.

The unknowns are tested as follows. After testing is complete, identify each solution.

Test I: Addition of 4 drops of universal indicator to 25 mL samples of each liquid gives the colors shown.

Test II: Two drops of 4 M NaOH are added to each of the solutions from Test I.

Test III: Four drops of 4 M HCl are added to each of the solutions from Test II.

Solution I is _____________.

Solution II is _____________.

Solution III is _____________.

Solution IV is _____________.


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