Formulae parentheses

In formulae, these enclosing marks are used in the following nesting order [],[()],[ () ], [( () )], [ ( () ) ], etc. Square brackets are normally used only to enclose entire formulae parentheses and braces are then used alternately (see also Sections IR-4.2.3 and IR-9.2.3.2). There are, however, some specific uses of square brackets in formulae, cf. Section IR-2.2.2.1. 

Example 4.7 illustrates that when more than one polyatomic ion appears in a chemical formula, parentheses are used to enclose the ion and a subscript is written after the closing parenthesis. Other examples are (NH4)2S04 and Fe3(P04)2-... 

Formula Searches spectra corresponding to a chemical formula. Parentheses are resolved, e.g., CH3CH(C(CH3)3)2 is converted to C10H22-Constraints like name fragment or certain peaks can be selected. 

Frequendy, one can display a stopping power formula as shown in Eq. (2.5), in which case the quantity within the parenthesis is called the kinematic factor... 

The protons in HvW,vO,vl i i are more accessible to water than in the dodecamer with Keggin structure [(H2)Wi204o]6, and a rapid exchange can be expected (145). Parenthesis are used in the Keggin formula to indicate the internal protons where necessary. The acceptance of a proton by paratungstate B, leads to the formation of three different species (141), its protonated form and the monoprotonated a- and /3-Keggin ions... 

Table 8 2PA properties of selected polymers. The solvent used in the measurement is indicated in parenthesis after the molecular formula and the average number of repeating units. The cross sections reported are the contributions per repeat units... 

The collection of atoms represented by a formula is called a formula unit. A chemical formula consists of symbols of element(s), often with subscripts that tell how many atoms of each element are present per formula unit. The subscript/oZ/ows the symbol of the element it multiplies. If no subscript is present, one atom of the element is indicated. Parentheses may be used in a formula to group bonded atoms together, and a subscript after the closing parenthesis tells how many of that group are present per formula unit. The following formulas illustrate the meanings of subscripts in formulas ... 

Hofmann 25) in 1851 used the stratified formula picture presented below. His addition of the parenthesis allowed him to justify his idea that the ammonium hydrogen was replaceable by both metals and other ammonium groups. 

A F Insert placeholder arguments and closing parenthesis after typing a function name in a formula Insert placeholder arguments and closing parenthesis after typing a function name in a formula... 

Least Common Multiples When writing chemical formulas or balancing a chemical equation, being able to identify the least common multiple of a set of numbers can often help. Your graphing calculator has a least common multiple function that can compare two numbers. On a TI-83 Plus or similar graphing calculator, press MATH >- 8. The screen should read lcm(. Next, enter one number and then a comma followed by the other number and a closing parenthesis. Press ENTER, and the calculator will show the least common multiple of the pair you entered. 

You will notice that the atomic mass of hydrogen appears in cell F2, but we do not quite have it right yet because the left parenthesis appears at the end of the string. This difficulty is easily fixed by typing — 1 at the end of the FIND function, which subtracts one from the character position of the left parenthesis to give the last character position of the atomic mass. Click on cell F2, then click in the formula bar at the end of the FIND function, and change the cell contents to the following ... 

We must determine the mass contributed by each element and then add them up to calculate the molar mass. When parentheses appear in the formula, each atom inside the parentheses must be multiplied by its own subscript and by the subscript appearing after the right-hand parenthesis. 

Figure 8.10 UV-visible spectra of the equimolar mixture of p-nitrophenyl-aza-phenol with [(PP3)RuH2l in the presence of 8 vol% of CHjCN and CHjCN in THF. c = 0.001 M, 230 K. The spectrum in pure THF is given for reference. The resulting media polarity (in parenthesis) was calculated according to the formula e = (cxhf thf + c,e,)/100, where q is the relative concentration of the ith component (Cj p + q = 100% v/v), and e,- is its dielectric permittivity at 230 K [25].

The subscript 3 is part of the nitrate ion formula, so it goes inside the parentheses. The two nitrate ions are shown by the subscript 2 after the closing parenthesis. 

When more than one polyatomic ion is needed for charge balance, parentheses are used to enclose the formula of the ion. A subscript is written outside the closing parenthesis of the polyatomic ion to indicate the number needed for charge balance. The formula for magnesium nitrate contains the magnesium ion and the polyatomic nitrate ion. 

The formula for the compound is written by enclosing the formula of the bicarbonate ion, HCOs , in parentheses and writing the subscript 3 outside the right parenthesis. 

The latest versions of Excel mark pairs of opening and closing parenthesis with different colors at scanning the formula by the pointer when editing a formula. 

Parentheses changing the order of operations 2 + 2 2 = 6 but (2-1-2) 2 = 8. It is recommended that a user types the left parenthesis ( followed by a right one ) and then moves a cursor left to one position and enters the required expression. Thus, we can control the number of initial and close parentheses in the expression (formula). one cannot enter brackets and braces. 

During the seventh collective period, the Index Guide was not yet available (it was first issued in 1967). Cross-references, subject terms and substance names are all included in the Subject Index itself (Fig. 58). Thus, a cross-reference under piceol refers to the name acetophenone, 4 -hydroxy-. In parenthesis in addition acetophenone there is another synonym which was commonly used at that time. The structural formula with appropriately numbered positions facilitates the classification of substituents. 

The coordination number of the ligand is put in front in parenthesis, if it is different from 1. The number of ligands is put behind the ligand code in the ligand formula, separated by colon. For searching and display there are two fields ... 

To balance the positive charge of 2+ on the magnesium ion, two nitrate ions are needed. In the formula of the compound, parentheses are placed around the nitrate ion, and the subscript 2 is written outside the right parenthesis. 

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