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A real back-and-forth, so the understanding stays yours, never a handed-over answer.
Any subject, any language
Math, science, history, languages: it works in whatever language is on the page.
One account, everywhere
Start on your phone after class, finish on the web at your desk. Your sessions sync.
Works on anything
Any sheet, any subject, any language, anywhere.
x² − 5x + 6 = 0
2H₂ + O₂ → 2H₂O
« Comment l'auteur crée-t-il le suspense ? »
A 2 kg block slides down a 30° ramp…
Explain the causes of the 1929 crash.
What you bring
DEVOIR MAISON · PAGE 14
Cinétique chimique
Exercice 3.Une réaction suit une cinétique d'ordre 1 de constante k. Établir l'expression du temps de demi-réaction, puis en déduire sa valeur.
a. Exprimer la vitesse de réaction. b. En déduire t1/2.
What you get
1
What does "order 1" tell you about the rate?
It's proportional to [A].
2
Exactly, so the half-life follows directly:
t1/2=kln2
your turn, try the next step
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