A Specific Time When a Given Event,or the Absence of That

question 41

Multiple Choice

A specific time when a given event,or the absence of that event,has the greatest impact on development is called a(n) __________ period.

• A) important
• B) essential
• C) required
• D) critical

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Definitions:

Reaction

A process in which substances, the reactants, undergo chemical changes to form new substances, known as products.

Product

The substances that result from the completion of a chemical reaction.

Ethylene Glycol

A colorless, viscous liquid with sweet taste commonly used as an antifreeze in automobile radiators and in the manufacture of polyester fibers and resins.

Acetal-Forming Reactions

Chemical reactions that involve the conversion of aldehydes or ketones, in the presence of an alcohol, into acetals or ketals, respectively.