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ADA NBDHE Dental Hygienist

Category - Scientific Basis for Dental Hygiene Practice

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There are two types of secondary chemical bonds. What are they?

Hydrogen bonding and Van der Waals forces
Plexus bonding and Van der Waals forces
Galvanic bonding and Van der Waals forces
Mechanical bonding and Van der Waals forces

Explanation

Answer: A - Hydrogen bonding and Van der Waals forces are the two types of secondary chemical bonds. Hydrogen bonding is found in most water-based liquids. It is when hydrogen is attracted to an electronegative element. Van der Waals forces are found in dental composites and acrylics. It is the dispersion of forces caused by fluctuating dipoles.

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