A Professor Cleans the Whiteboard Before Every Class

question 52

Multiple Choice

A professor cleans the whiteboard before every class. He goes over the board at least three times before he considers it to be clean enough. Recently he has been late starting class because he is cleaning the whiteboard more and more. He is preoccupied with thoughts that previous markings are dirty and will contaminate his notes. A psychotherapist would say that this professor's _________ are compulsive.

• A)thoughts about previous markings contaminating his notes
• B)thoughts about what he will teach in class
• C)behaviours of cleaning the whiteboard
• D)habits of starting the class late

---

Definitions:

Lewis Dot Structure

A graphical representation of the valence electrons of atoms, indicating how the electrons are shared or paired between atoms in a molecule.

Ca

Calcium, a chemical element with the symbol Ca and atomic number 20, an alkaline earth metal essential for living organisms, particularly in cell physiology.

Lewis Dot Structure

A diagrammatic representation of the valence electrons in an atom, ion or molecule, using dots around the symbol of an element.

Potassium

A soft, silvery-white metallic element, highly reactive and essential for biological organisms, symbolized as K.