21st Rule - definição. O que é 21st Rule. Significado, conceito
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O que (quem) é 21st Rule - definição


21st Rule         
Throughout the period before the American Civil War, petitions and memorials relating to the slavery question appeared in many records of the United States Congress. Between 1836 and 1844, the 21st rule of the U.
Zaitsev's rule         
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  • Alexander Mikhaylovich Zaitsev
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EMPIRICAL RULE PREDICTING THE MAJOR PRODUCT(S) IN ELIMINATION REACTION
Saytzeff's rule; Zaitsev's Rule; Zaitsev's product; Saytzeff rule; Saytzeff's Rule; Saytzev's rule; Zaytsev product; Saytzeff Rule; Zaitsev rule; Saytsev's rule; Saytsev rule
In organic chemistry, Zaitsev's rule (or Saytzeff's rule, Saytzev's rule) is an empirical rule for predicting the favored alkene product(s) in elimination reactions. While at the University of Kazan, Russian chemist Alexander Zaitsev studied a variety of different elimination reactions and observed a general trend in the resulting alkenes.
mail box rule         
RULE REGARDING ACCEPTANCE BY POST OF OFFERS IN ANGLO-AMERICAN CONTRACT LAW
Mail box rule; Postal acceptance rule; Postal rule; Postage rule; Deposited acceptance rule; Mailbox rule; Postal exception
n. in contract law, making a written offer or acceptance of offer valid if sent in the mail, with postage, within the time in which the offer must be accepted, unless the offer requires acceptance by personal delivery on or before the specified date. The rule may also apply to mailing payments of insurance premiums when due. However, relying on this so-called "rule" can be dangerous, since the party awaiting the acceptance or payment may cancel the offer if there is no response in hand when the time runs out.