Basic principles. There are two systems of naming molecular compounds. Number : Prefix one : mono- six : hexa- two : di- seven : hepta- three : tri- eight : octa- four : tetra- nine : nona- five : penta- ten : deca- Example #1 - write the name for N 2 O. The first uses prefixes to indicate the number of atoms of an element that are in the compound. For historical reasons, the name "kilogram" for the SI base unit of mass contains the name "kilo," the SI prefix for 10 3.Thus, because compound prefixes are unacceptable, symbols for decimal multiples and submultiples of the unit of mass are formed by attaching SI prefix symbols to g (gram). In chemistry, a number of prefixes, suffixes and infixes are used to describe the type and position of the functional groups in the compound.. R-0.1.8.4 Subtractive prefixes (such as anhydro-, dehydro-, demethyl-) have been used as "detachable" or "nondetachable" in previous editions of the IUPAC Nomenclature of Organic Chemistry, but in these recommendations, they are presented as nondetachable. "Mono" is not used to name the first element . There are 10 millimeters in 1 centimeter and 100 centimeters in 1 meter. 4. Learn numbers chemistry prefixes with free interactive flashcards. Prefix Number of occurrences mono- 1 di- 2 tri- 3 tetra- 4 penta- 5 hexa- 6 hepta- 7 octa- 8 nona- 9 deca- 10 Example to R-0.1.8.4 (nondetachable) R-0.1.8.5 Additive prefixes. Thus water is dihydrogen monoxide. A huge number of products around us are organic substances; also organic chemistry is the chemistry of life. Step #1 - part of the first name is the unchanged name of the first element in the formula. The symbol, the name, the corresponding factor as well as an example for each prefix are presented. Here is a number line with the two prefixes in problem sixteen marked: Compute the absolute, exponential distance between two given prefixes: 16) kilo and femto 17) milli and micro 18) micro and mega 19) centi and pico 20) nano and kilo 21) deci and tera 22) pico and micro 23) kilo and giga 24) femto and centi 25) milli and centi To find the exponent count the number of places from the decimal to the end of the number. SI Prefixes Used with Units in Physics, Chemistry and Engineering Below are shown the prefixes (factors) used with units in physics, chemistry and engineering. Example #2 - write the name for NO 2. The steps for naming an organic compound are: Identification of the parent hydrocarbon chain.This chain must … A numerical prefix lets you know how many there are of a particular thing. Naming molecules in chemistry . In the number 123,000,000,000 The coefficient will be 1.23. Metric Prefixes. In 123,000,000,000 there are 11 places. Here are some common numerical prefixes. 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