Archief - de moeilijke vergelijking :s

Damn, moeilijke vergelijking.

En ik die dacht eindelijk de diepste geheimen van de wiskunde te ontdekken in deze thread.

Als dat een moeilijke vergelijking is, dan gaat ge nog afzien vrees ik..

Discriminant:
D = b² - 4 ac

D>0 -> 2 opl (x1 & x2)
D=0 -> 1 opl (x1=x2)
D<0 -> geen opl

x1 = -b + D / 2a
x2 = -b - D / 2a

of ik begin te flipn, wat ik nog herinner, s al tijdje geleden

scowcroft zei:

Discriminant:
D = b² - 4 ac

D>0 -> 2 opl (x1 & x2)
D=0 -> 1 opl (x1=x2)
D<0 -> geen opl

x1 = -b + D / 2a
x2 = -b - D / 2a

of ik begin te flipn, wat ik nog herinner, s al tijdje geleden

Klik om te vergroten...

Correctie:
x1 = -b + sqrt(D) / 2a
x2 = -b - sqrt(D) / 2a

Bij ons gaan ze er van uit dat we dat in het kleuterklasje gezien hebben...

X=3, gokske xD

Wiskunde hebt ge nie nodig mannen!

te zien aan deze thread, zit dit forum toch wel stampvol met elitaire retards denk ik !

Sephiroth zei:

te zien aan deze thread, zit dit forum toch wel stampvol met elitaire retards denk ik !

Klik om te vergroten...

Kunt ge dat wiskundig staven?

nee, maar ik kan wel iets anders staven
...u moeder

Als je dat moeilijk vindt raad ik u aan om niet wiskundige richtingen te volgen want dat was gewoon belachelijk.

Sephiroth zei:

te zien aan deze thread, zit dit forum toch wel stampvol met elitaire retards denk ik !

Klik om te vergroten...

eerder de starter van deze thread die het iq van een baksteen heeft
als die vergelijking "moeilijk" is -_-. da hij z'n boek opent en eens leest hoe ge een vierkantsvergelijking oplost hé

Give him a break, de jongen is wsl 14 jaar, heeft geen zin in huiswerk, wilt liever wa wow'en en komt jullie vragen om zijn huiswerk te doen.

Sephiroth zei:

nee, maar ik kan wel iets anders staven
...u moeder

Klik om te vergroten...

Man, ik kom niemeer bij ge-ni-aal, wat een fijntje

Sephiroth zei:

nee, maar ik kan wel iets anders staven
...u moeder

Klik om te vergroten...

Ja, dát was me wel even een giller zeg.

pjpietje zei:

ik was bezig aan mijn huiswerk, maar ik zit vast. Ik kan deze vergelijking maar niet oplossen. Weet iemand raad

X²-5X+6=0

de vraag hoeveel is X??

Klik om te vergroten...

hier een beknopt antwoord:

Molecular and structural formula

For example methane, a simple molecule consisting of one carbon atom bonded to four hydrogen atoms, has the chemical formula:

CH4

and glucose with six carbon atoms, twelve hydrogen atoms and six oxygen atoms has the chemical formula:

C6H12O6.

A chemical formula supplies information about the types and spatial arrangement of bonds in the chemical, though it does not necessarily specify the exact isomer. For example ethane consists of two carbon atoms single-bonded to each other, with each carbon atom having three hydrogen atoms bonded to it. Its chemical formula can be rendered as CH3CH3. In ethylene there is a double bond between the carbon atoms (and thus each carbon only has two hydrogens), therefore the chemical formula may be written: CH2CH2, and the fact that there is a double bond between the carbons is implicit because carbon has a valence of four. However, a more explicit and correct method is to write H2C=CH2 or less commonly H2C::CH2. The two lines (or two pairs of dots) indicate that a double bond connects the atoms on either side of them.

A triple bond may be expressed with three lines or pairs of dots, and if there may be ambiguity, a single line or pair of dots may be used to indicate a single bond.
Carbon chain

Molecules with multiple functional groups that are the same may be expressed in the following way: (CH3)3CH. However, this implies a different structure from other molecules that can be formed using the same atoms (isomers). The formula (CH3)3CH implies a chain of three carbon atoms, with the middle carbon atom bonded to another carbon (see image of 4 carbon "C" atoms), and the remaining bonds on the carbons all leading to hydrogen atoms (hydrogen atoms are not shown in image). However, the same number of atoms (10 hydrogens and 4 carbons, or C4H10) may be used to make a straight chain: CH3CH2CH2CH3.

The alkene but-2-ene has two isomers which the chemical formula CH3CH=CHCH3 does not identify. 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 sides from each other (trans or E).

[edit] Polymers

For polymers, parentheses are placed around the repeating unit. For example, a hydrocarbon molecule that is described as: CH3(CH2)50CH3, is a molecule with fifty repeating units. If the number of repeating units is unknown or variable, the letter n may be used to indicate this: CH3(CH2)nCH3.

[edit] Ions

For ions, the charge on a particular atom may be denoted with a right-hand superscript. For example Na+, or Cu2+. The total charge on a charged molecule or a polyatomic ion may also be shown in this way. For example: hydronium, H3O+ or sulfate, SO42-.

For more complex ions, brackets [ ] are often used to enclose the ionic formula, as in [B12H12]2-. Parentheses ( ) can be nested inside brackets to indicate a repeating unit, as in [Co(NH3)6]3+. Here (NH3)6 indicates that the ion contains six NH3 groups, and [ ] encloses the entire formula of the ion with charge +3.

[edit] Isotopes

Although isotopes are more relevant to nuclear chemistry or stable isotope chemistry than to conventional chemistry, different isotopes may be indicated with a left-hand superscript in a chemical formula. For example, the phosphate ion containing radioactive phosphorus-32 is 32PO43-. Also a study involving stable isotope ratios might include the molecule 18O16O.

A left-hand subscript is sometimes used to indicate redundantly the atomic number. For example, 8O2 for dioxygen, and 168O2 for the most abundant isotopic species of dioxygen. This is convenient when writing equations for nuclear reactions, in order to show the balance of charge more clearly.

[edit] Empirical formula

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 the compound. Empirical formulas are the standard for ionic compounds, such as CaCl2, and for macromolecules, such as SiO2. An empirical formula makes no reference to isomerism, structure, or absolute number of atoms. The term empirical refers to the process of elemental analysis, a technique of analytical chemistry used to determine the relative percent composition of a pure chemical substance by element.

For example hexane has a molecular formula of C6H14, or structurally CH3CH2CH2CH2CH2CH3, implying that it has a chain structure of 6 carbon atoms, and 14 hydrogen atoms. However, the empirical formula for hexane is C3H7. Likewise the empirical formula for hydrogen peroxide, H2O2, is simply HO expressing the 1:1 ratio of component elements.

[edit] Trapped atoms

The @ symbol ("at") indicates an atom or molecule trapped inside a cage but not chemically bound to it. This notation became popular in the 1990s with the discovery of fullerene cages, which can trap atoms such as La to form La@C60 or La@C82 for example. A non-fullerene example is [As@Ni12As20]3-, an ion in which one As atom is trapped in a cage formed by the other 32 atoms.

[edit] Non-stoichiometric formulas

Main article: Non-stoichiometric compound

Chemical formulas most often use integers for each element. However, there is a whole class of compounds, called non-stoichiometric compounds, that cannot be represented by small integers. Such a formula might be written using decimal fractions, as in Fe0.95O, or it might include a variable part represented by a letter, as in Fe1–xO, where x is normally much less than 1.

[edit] General forms for organic compounds

Chemical formula used for a series of compounds that differ from each other by a constant unit is called general formula. Such a series is called the homologous series, while its members are called homologs.

[edit] Hill System

Main article: Hill system

The Hill system is a system of writing chemical formulas such that the number of carbon atoms in a molecule is indicated first, the number of hydrogen atoms next, and then the number of all other chemical elements subsequently, in alphabetical order. When the formula contains no carbon, all the elements, including hydrogen, are listed alphabetically. This deterministic system enables straightforward sorting and searching of compounds.

[edit] References

Ralph S. Petrucci, William S. Harwood and F. Geoffrey Herring, General Chemistry, 8th Edition (Prentice-Hall 2002), chapter 3.


hopelijk is het duidelijk

Is der iemand die da volledig ga lezen?

wiskundige richting doe ik niet. Ik doe een bouwkundige riching

Dit was namelijk de oefening. Als het allemaal zo makkelijk is volgens jullie, doe dan eens een gokje op de oplossing

de opgave:
ImageShack - Hosting :: wiskundelv3.jpg

haha zalig nu mogen we heel zen huiswerk al maken, khoop da er geen r-tard is da die nog maakt :')