Iowa Cosmetology Practice Exam

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Study for the Iowa Cosmetology Exam. Prepare with flashcards and multiple choice questions, each question offers hints and detailed explanations. Get ready to ace your exam!

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Which bond is considered a strong chemical bond?

Hydrogen bond
Salt bond
Disulfide bond
Ionic bond

The correct answer is: Disulfide bond

A disulfide bond is considered a strong chemical bond because it involves the sharing of two pairs of electrons between two sulfur atoms. This leads to a strong attraction between the atoms and creates a stable bond. In contrast, a hydrogen bond is a weaker type of bond that occurs when a hydrogen atom with a partially positive charge is attracted to a more electronegative atom. A salt bond, also known as an ionic bond, involves the attraction between positively and negatively charged ions, but it is not as strong as a disulfide bond. An ionic bond can easily be broken by water or changes in pH. It is also important to note that salt bonds and hydrogen bonds are not covalent bonds like disulfide bonds, which means they do not involve the sharing of electrons and are therefore not as strong.