interactiongravitationelle:GmAmB/d2d2x10puissance-6interactionelectrostatique:kqAqB/dABcalculerrapportforce:FG/Fel=resultatobtenu/plusgrande=prédominanteCalculerpoidsforce:P=mg=mxg=menkgg/1000P=poidsG=actionàdistanceR=reactionA=contactPointd'application
sens
direction
intensite: P=mg
immobile?= On va utilser
le principe d'inertie:toutcorpssoumisàdesforcesquisecompensentestsoitimmobile,soitenmouvementrectiligneuniformeDonc=P+R=O?nepasoublierlaflecheCen'est pas égal à 0 car
P et R (fleche) n'ontpaslamêmedirectiondoncilsnepeuventpassecompenserdoncl'objet ne va pas
rester immobile.
virifier que ca empeche
de tomber:
F+P+R=O?
(-Fcos 30/Fsin30)
+ (O/-P)+(Rcos 60/Rsin60)=
(O/O)
sin 0x: -F cos 30 + R cos 60
= 0
F= R cos 60/ cos 30 =
Fx 1/2 x 2/ racine 3
O,5/ racine 3 = barré 0,25
cos 60 = 1/2
cos 30= 2/racine 3
titrant/reactif
equivalence sera au
changement de couleur
incolore = violet
solvant = barré dans tableau
exces pareil
Co= 0,56 mol.L-1
C = Cm/M
MC2O4H2 = 2MC+4MO+2MH
C=12
O=16
H=1
C=50/2x12+4x16+2x1 = ?
volume equi=
na/a=nb/b = nMnO4-/2 =
nC2OO4H2/5
n+CxV
CMn04- x Vo/2 =
CC204H2 x Vo
Veq= 2CC2O4H2 x Vo/5MnO4-
= 2x0,56x20/5x5,00.10-2 =?
On a Veq > 25mL donc il faut
diluer la solution à doser
Co'=Co/10=V'eq = Veq/10
= 9mL qui sera possible
d'avoirburetteTTAGAUCHEerlenmeyerturbulentagitateeurmagnétiquetitrantenhautMnO4-C=Veq=titré/reactifenbasC2O4H2C=V=nA/a=nB/bCMnO4--Veq/2=CC204H2xVo/5CC204H2=5CMn04--Veq/2Vo=5x5,00.10-2x7,18=?Co=CC204H2x10=?Cm=resultatx90=?<50g.L
During your visit to our site, NumWorks needs to install "cookies" or use other technologies to collect data about you in order to:
Ensure the proper functioning of the site (essential cookies); and
Track your browsing to send you personalized communications if you have created a professional account on the site and can be contacted (audience measurement cookies).
With the exception of Cookies essential to the operation of the site, NumWorks leaves you the choice: you can accept Cookies for audience measurement by clicking on the "Accept and continue" button, or refuse these Cookies by clicking on the "Continue without accepting" button or by continuing your browsing. You can update your choice at any time by clicking on the link "Manage my cookies" at the bottom of the page. For more information, please consult our cookies policy.