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Topic: Chemical formula


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In the News (Mon 10 Dec 18)

  
  Chemical Formula
The format for the chemical formula is based on the reported formula from the literature source for the mineral.
In many cases, the formula is base on the structural interpretation of the mineral, especially the silicates.
The chemical formula is closely matched to the mineral's crystallographic unit cell dimensions and "Z" value.
webmineral.com /help/ChemicalFormula.shtml   (193 words)

  
  NationMaster - Encyclopedia: Chemical Formula
The periodic table of the chemical elements A chemical element, or element for short, is a type of atom that is defined by its atomic number; that is, by the number of protons in its nucleus.
Its chemical formula can be rendered as CH If there were a double bond between the carbon atoms (and thus each carbon only had two hydrogens), the chemical formula may be written: CH, and the fact that there is a double bond between the carbons is assumed.
In chemistry, the empirical formula of a chemical is a simple expression of the relative number of each type of atom or ratio of the elements in it.
www.nationmaster.com /encyclopedia/Chemical-Formula   (632 words)

  
  Chemical formula - Wikipedia, the free encyclopedia
It identifies each type of chemical element by its element symbol and identifies the number of atoms of such element to be found in each discrete molecule of that compound.
Its chemical formula can be rendered as CH If there were a double bond between the carbon atoms (and thus each carbon only had two hydrogens), the chemical formula may be written: CH, and the fact that there is a double bond between the carbons is assumed.
In chemistry, the empirical formula of a chemical is a simple expression of the relative number of each type of atom or ratio of the elements in it.
en.wikipedia.org /wiki/Chemical_formula   (828 words)

  
 Chemistry : Chapter 4 : Overview   (Site not responding. Last check: )
Chemical formulas use the chemical symbol of the atom to express the type of atom and a subscript following the symbol to express the number of atoms in the molecule.
When determining mole ratio (or chemical formula), it is convenient to assume there is 100 g of compound (since another way of looking at percent is grams of element in 100 g of compound).
A balanced chemical equation describes both the ratio of molecules needed for a chemical reaction and the ratio of moles needed for a chemical reaction.
www.wwnorton.com /chemistry/overview/ch4.htm   (1537 words)

  
 Chemical compound - Wikipedia, the free encyclopedia
A chemical compound is a chemical substance formed from two or more elements, with a fixed ratio determining the composition.
Formulas describe the ratio of atoms in a substance, and the number of atoms in a single molecule of the substance (thus the formula for ethene is C
The formula does not indicate that a compound is composed of molecules; for example, sodium chloride (table salt, NaCl) is an ionic compound.
en.wikipedia.org /wiki/Chemical_compound   (188 words)

  
 formula, in chemistry. The Columbia Encyclopedia, Sixth Edition. 2001-05
Formulas of compounds are used in writing the equations (see chemical equations) that represent chemical reactions.
Water is made up of molecules, and the formula shows that each molecule consists of two atoms of hydrogen, H, bonded to an atom of oxygen, O. The subscript 2 indicates that there are two atoms of hydrogen in the molecule; where no subscript appears, as after the O, the subscript 1 is implied.
The semistructural formula for dimethyl ether may be written CH Here the O is placed between the two carbon atoms to show that the carbons are bonded to the oxygen.
www.bartleby.com /65/fo/formu-che.html   (871 words)

  
 Chemical Formula Search
If correct case is not used, the formula may be ambiguous and the interpretation chosen may not be the desired one.
To explicitly specify an ion, place the charge at the end of the formula.
When checked, this option indicates that species containing elements not specified in the formula will also be matched.
webbook.nist.gov /chemistry/form-ser.html   (424 words)

  
 chemical formula for water vapor : Search Results : GoodSearch : Search the Internet with GoodSearch and support your ...
Chemical Formula for water is H2O -- two Hydrogens covalently bound to an Oxygen...
This is the chemical formula for water _.
Write the chemical formula of water on the board and explain the components that...
www.goodsearch.com /Search.aspx?Keywords=chemical+formula+for+water+vapor   (326 words)

  
 Chemical Formulas
A chemical formula is similar to an algebraic formula in its use of symbols.
Chemical formulas (or more correctly: formulae) are designations of molecules and compounds in shorthand notation, similar to that used in Algebra.
A chemical formula is writing the elements of a compound, using their abbreviations.
www.cartage.org.lb /en/themes/Sciences/Chemistry/Inorganicchemistry/chemicslformula/Formula/chemicalformulas.htm   (531 words)

  
 Chemical Formulas
Chemical symbols of elements in the chemical formula represent the elements present, and subscript numbers represent mole proportions of the proceeding elements.
From a chemical point of view, an element contained in the substance is a fundamental question, and we represent the elemental composition by a chemical formula, such as H
A chemical formula not only represents what a substance is made of, it provides a great deal of information about the substance.
www.science.uwaterloo.ca /~cchieh/cact/c120/formula.html   (1600 words)

  
 Kids.net.au - Encyclopedia Chemical formula -   (Site not responding. Last check: )
A chemical formula is a concise way of expressing information about the atoms that constitute a particular chemical compound.
The relative position of the two methyl groups must be indicated by additional notation denoting whether the methyl groups are on the same side of the double bond (cis or Z) or on the opposite size from each other (trans or E).
Although isotopes are more relevant to nuclear chemistry than to conventional chemistry, different isotopes may also be indicated as a left-hand superscript in a chemical formula.
www.kidsseek.com /encyclopedia-wiki/ch/Chemical_formula   (555 words)

  
 :: Physical and Chemical Properties of Stones ::
Agates are identical in chemical structure to jasper, flint, chert, bloodstone, and tiger-eye, and are often found in association with opal.
Chemically, Carnelian is composed of Silicon Dioxide, SiO
Physical and Chemical Properties: Sodalite is a deep, rich blue stone with white inclusions typically occurring in nepheline, syenites and related rocks.
www.semiprecious.com /Physical_chemical_properties.htm   (2441 words)

  
 The MSDS HyperGlossary: Chemical Formula
A chemical formula expresses the exact composition of a molecule or substance using the chemical abbreviations of the chemical elements.
Structural formulas are a version of a molecular formulas in which the connectivity of the atoms is implied.
Chemical names are not always reliable because a common chemical may be known by several different names.
www.ilpi.com /msds/ref/chemicalformula.html   (635 words)

  
 Braille Code of Chemical Notation 1997
Chemical formulas and equations may contain electron dots, bonds, mathematical operation and comparison signs, chemical arrows, and other notation.
A chemical formula which gives the composition of a compound but does not specify the structural arrangement or proportion.
This is a formula which employs the SYMBOL of an element to represent the nucleus of an atom and all electrons except those in the outer level.
www.brl.org /chemistry/rule04.html   (2772 words)

  
 [No title]
Each test has a chemical formula and a number of possible reaction outcomes that his students are to choose one correct from.
Each chemical formula is at most 100 characters long, and every distinct chemical element is guaranteed to occur for a total of no more than 10000 times in each formula.
Input The first line of the input file represents a chemical formula that is to be tested as the left side of the equation.
icpc.baylor.edu /past/icpc2002/Regionals/NEERC01/problems/e-chem.doc   (577 words)

  
 PDB FILE FORMAT FAQ
The PDB Chemical Component Dictionary (formerly the HET Group Dictionary) is available in PDB [8.5 Mb] and mmCIF [15.7 Mb] formats, and is updated weekly.
The chemical name of the ligand is given in the HETNAM record and the chemical formula is given in the FORMUL record.
The chemical name for the chemical component is given by chem_comp.name, the chemical formula by chem_comp.formula, and the molecular weight by chem_comp.formula_weight.
deposit.pdb.org /cc_dict_tut.html   (1167 words)

  
 Chemical Formula
Identify the chemical formulas for several common substances.
Chemical formulas are used to describe the types of atoms and their numbers in an element or compound.
When more than one atom of a specific element is found in a molecule, a subscript is used to indicate this in the chemical formula.
www.ndt-ed.org /EducationResources/HighSchool/Radiography/chemicalformula.htm   (213 words)

  
 Lucid "Stoichiometry"
We know that the molar mass of a chemical compound is the mass of 1 mole of a chemical compound and we know that 1 mole of a chemical compound is one mole of its chemical formula unit.
Notice that, in this case, the empirical formula is not the chemical formula (because the molar masses are different).
But the chemical formula must be some integer factor of the empirical formula (thus, the molar mass of the chemical formula must be some integer factor of the empirical formula).
www.chem.lsu.edu /lucid/subjectinfo/stoichiometry.html   (1848 words)

  
 formula.htm
When writing a chemical formulae from the name of an ionic compound, one must consider the ions contained in the compound.
The inability to recognize these ions are the main reason for difficulty in writing chemical formulae of inorganic compounds.
Thus, the formula for carbon dioxide is CO, since the name indicates one carbon (no prefix), and two oxygens (prefix di- means 2).
www.towson.edu /~ladon/formula.html   (743 words)

  
 About chemical formulae
Several kinds of chemical formulae may be attached to a sample record:
· Empirical formula: this is the observed empirical formula of the sample.  It is suggested that every sample record contain one of these.  Coefficients and subscripts may be expressed as whole numbers or as decimals.
· Empirical formula — derived: like the Empirical formula — less solvent above, this kind of formula is not a true empirical formula and is useful mainly for samples that are intended for release to a “general science” audience.
www.reciprocalnet.org /networkinfo/docs/userguide/userguidep38.html   (396 words)

  
 Lesson 5-3 Writing Chemical Formulas
A chemical formula is a combination of elemental symbols and subscript numbers that is used to show the composition of a compound.
A special type of chemical formula, called an empirical formula, shows the composition of a molecule not as it actually exists, but in a simple whole number ratio.
When you write the formulas for binary compounds, they will consist of two elemental symbols, and they may also have one or two subscript numbers, if the elements don't combine in a one to one ratio.
www.fordhamprep.org /gcurran/sho/sho/lessons/lesson53.htm   (1998 words)

  
 CHEMICAL FORMULAS   (Site not responding. Last check: )
CALCULATION OF The empirical formula of a compound may be determined from a knowledge of the composition by weight and the atomic weights of the elements represented in the compound.
Determine the true formula of the compound having a molecular weight of approximately 92 and containing 0.36 g of carbon, 0.090 g of hydrogen, and 0.24 g of oxygen.
The empirical formula of a certain compound is AB If it is known to contain 60% A, having an atomic weight of 30 what must be the atomic weight of B? A sample of hydrocarbon weighing 0.5000 g produced 1.650 g of CO when burned in pure oxygen.
iweb.tntech.edu /chem101-tf/formulas_2.html   (667 words)

  
 Chemical Formula
The format for the chemical formula is based on the reported formula from the literature source for the mineral.
In many cases, the formula is base on the structural interpretation of the mineral, especially the silicates.
The chemical formula is closely matched to the mineral's crystallographic unit cell dimensions and "Z" value.
www.webmineral.com /help/ChemicalFormula.shtml   (211 words)

  
 You are expected to know the chemical formula and the standard state phase(   (Site not responding. Last check: )
You are expected to know the chemical formula and the standard state phase(25 degrees C and 1 atmosphere of pressure) for all of the elements in the periodic table.
A chemical equation is a symbolic representation of all of the substances involved in a chemical reaction.
The form of a chemical equation involves writing the formulas of the reactants (the substances that are mixed together) on the left, using '+' when more than one substance is involved and the formula(s) of the product(s) on the right.
intro.chem.okstate.edu /1215/Lecture/Chapter6/Lecture92398.html   (1334 words)

  
 Chemical Formulas - Succeed in Physical Science   (Site not responding. Last check: )
A molecule or compound consists of at least two atoms that are chemically bonded.
The chemical formula of a molecule or compound states how many atoms of each element are in one of its molecules.
This formula is similar to an algebraic formula in its use of symbols.
www.school-for-champions.com /science/chemformulas.htm   (944 words)

  
 STN Easy Quick Tips - Formatting Chemical Formulas
Write the chemical formula as it is known.
Write the chemical formula for the monomer as it is known.
Write the chemical formulas for each monomer as it is known.
www.cas.org /training/stneasytips/subinforformula1.html   (300 words)

  
 Chemical Bonding
We represent compounds by chemical formulas - shorthand notation showing the kinds and numbers of atoms in the smallest representative unit of a substance.
In chemical formula, we use elemental symbols to indicate the types of atoms present and subscripts to indicate the number them.
Glucose is an example of a molecule- an electrically neutral group of tightly bound atoms that act a as a unit.
darkwing.uoregon.edu /~ch111/L10.htm   (581 words)

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