Exercices S'entraîner 34 Homeopathy and dilutions Extraire et exploiter des informations; effectuer un calcul; pratiquer une langue vivante étrangère. Homeopath
Physique/Chimie
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Question
Exercices S'entraîner
34 Homeopathy and dilutions
Extraire et exploiter des informations; effectuer un
calcul; pratiquer une langue vivante étrangère.
Homeopathy is an alternative medicine created in
1796 by Samuel Hahnemann. He thought that a
substance that causes the symptoms of a disease¹
in healthy people will cure similar symptoms in sick
people. The remedies are prepared by repeatedly
diluting a stock solution² in alcohol or distilled water,
followed by forceful³ shaking. Hahnemann created
the "centesimal" or "C scale", diluting a substance by
a factor of 100 at each stage4.
Vocabulary : 1. disease: maladie; 2. stock solution: solution
mère; 3. forceful: énergique; 4. stage: étape.
1. What is the dilution factor that makes a 1C solution
become a 2C solution?
2. If the mass concentration of the active ingredient of
the stock solution is equal to 5,0 g L-1, what is the mass
concentration of the solution at 11C?
3. In a stock solution of arnica, the main active ingredient
is helenalin, which has anti-inflammatory properties. The
mass of helenalin molecule is: mhelenalin = 4,36 x 10-22 g.
a. Find how many helenalin molecules are contained in
a liter of 11C arnica solution prepared from the stock
solution from the question 2.
Quelqu’un peut me dire ce que 100 représente
34 Homeopathy and dilutions
Extraire et exploiter des informations; effectuer un
calcul; pratiquer une langue vivante étrangère.
Homeopathy is an alternative medicine created in
1796 by Samuel Hahnemann. He thought that a
substance that causes the symptoms of a disease¹
in healthy people will cure similar symptoms in sick
people. The remedies are prepared by repeatedly
diluting a stock solution² in alcohol or distilled water,
followed by forceful³ shaking. Hahnemann created
the "centesimal" or "C scale", diluting a substance by
a factor of 100 at each stage4.
Vocabulary : 1. disease: maladie; 2. stock solution: solution
mère; 3. forceful: énergique; 4. stage: étape.
1. What is the dilution factor that makes a 1C solution
become a 2C solution?
2. If the mass concentration of the active ingredient of
the stock solution is equal to 5,0 g L-1, what is the mass
concentration of the solution at 11C?
3. In a stock solution of arnica, the main active ingredient
is helenalin, which has anti-inflammatory properties. The
mass of helenalin molecule is: mhelenalin = 4,36 x 10-22 g.
a. Find how many helenalin molecules are contained in
a liter of 11C arnica solution prepared from the stock
solution from the question 2.
Quelqu’un peut me dire ce que 100 représente