Q: The force of attraction between unlike atoms and molecules is called:
dental material, adhesion, cohesion, dental hygiene exam prep

Q: The force of attraction between unlike atoms and molecules is called:

The force of attraction between unlike atoms and molecules is called:

(A.) Cohesion
(B.) Viscosity
(C.) Mechanical bonding
(D.) Adhesion

dental material, adhesion, cohesion, dental hygiene exam prep
Mini Boards Reviews for the National + Local Anesthesia Dental Hygiene Boards

Answer: (D.) Adhesion

Keywords: unlike

The force of attraction between unlike atoms and molecules on two different surfaces is called adhesion (e.g., a water molecule is attracted to a tree leaf). The chance of adhesion is directly proportional to the amount of contact area.
The force of attraction between like atoms and molecules is called cohesion (e.g., a water molecule is attracted to another water molecule). This type of attraction creates a tenacious bond.
Mechanical bonding is the physical interlocking of materials (e.g., sealant materials attach to pores created by an acid etch on the tooth surface).
Viscosity is the ability of liquid material to flow. High-viscosity materials are thicker and do not flow well.

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Written by
Claire Jeong, RDH, MS

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