Lewis acids and bases Lewis acids and bases A Lewis acid is a chemical species that contains an empty orbital which is capable of accepting an electron pair from a Lewis base to form a Lewis adduct. A Lewis base, then, is any species that has a filled orbital containing an electron pair which is not involved in bonding but may form a dative bond with a Lewis acid to form a Lewis adduct. For example, NH is a Lewis base, because it can donate its lone pair of electrons. Trimethylborane (MeB) is a Lewis acid as it is capable of accepting a lone
Prefixes in Hebrew Hebrew serve multiple purposes. A prefix can serve as a conjunction, preposition, definite article, or interrogative. Prefixes are also used when conjugating verbs in the future tense and for various other purposes. These prefixes (Hebrew: תְּחִלִּית "t'chilit") often come from loanwords from English (Latin, Greek, etc...) which are especially prevalent with technical and academic terms. Other prefixes are native to Hebrew (ex. rav). When the Hebrew prefix does not line up in similarity to the English, Greek, or Latin one that is because it is of Hebrew origin. Prefixes in Hebrew There are several prefixes in the Hebrew language which