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  • Verified by Alloprof
    TyrannosaureDelta3413avatar
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    Secondary IV • 2yr.

    Je ne comprends pas ce numéro quelqu’un pourrait me l’expliquer svp ?

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    Ce contenu est protégé par le droit d'auteur. Toute reproduction à l'extérieur des forums Alloprof est interdite et pourra être considérée comme une violation du droit d'auteur.

    i-icon
    Chemistry
    1 answer
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    R2D2Beta6237avatar
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    Secondary V • 2yr.

    Je ne comprend pas la question.

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    i-icon
    Chemistry
    1 answer
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    TourterelleOmicron3014avatar
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    Secondary V • 2yr.

    Comment peut on déterminer la valeur de la constante d’acidité du deuxième H+ perdu par un polyacide fort donnant 2 H+ en laboratoire?

    Chemistry
    1 answer
  • Verified by Alloprof
    TourterelleOmicron3014avatar
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    Secondary V • 2yr.

    Comment peut on déterminer la valeur de la constante d’acidité du deuxième H+ perdu par un polyacide fort donnant 2 H+?

    Chemistry
    1 answer
  • Verified by Alloprof
    SaturneVirtuose3601avatar
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    Secondary V • 2yr.

    Lors d’une expérience de calorimétrie, on observe que 50 ml d’un liqueur inconnu absorbé 3626J lorsque la température passe de 20.0°C a 55.0°C.

    Calculer la capacité thermique (C) de ce liquide, sachant que sa masse volumique et de 1.120 g/ml.

    Je ne sais pas comment procéder avec ce problème. Merci pour votre aide ! Quel sont les étapes requises pour régler ce problème ?

    Chemistry
    1 answer
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    ZenShark5377avatar
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    Secondary V • 2yr.

    Déterminez, l'ordre de la réaction par rapport à chacun des réactifs.

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    i-icon
    Chemistry
    1 answer
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    PythonVolubile4352avatar
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    Secondary V • 2yr.

    Bonjours,

    J’ai un labo de chimie à faire et on me demande si il y’a un lien être le pH, la concentration en acide acétique et la constante d’acidité, et si oui, quelle est la concentration en acide acétique du vinaigre (CH3COOH).

    Merci beaucoup pour votre aide!

    Chemistry
    1 answer
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    AiguemarineSigma1783avatar
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    Grade 4 • 2yr.

    Pourquoi la lune a-t-elle des phases différentes 

    Chemistry
    2 answers
  • Verified by Alloprof
    ZenShark5377avatar
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    Secondary V • 2yr.

    thank you so much. I also have this question that is related to the first question.

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    i-icon
    Chemistry
    1 answer
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    ZenShark5377avatar
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    Secondary V • 2yr.

    This is my chemistry question. Can someone pls help me.

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    Ce contenu est protégé par le droit d'auteur. Toute reproduction à l'extérieur des forums Alloprof est interdite et pourra être considérée comme une violation du droit d'auteur.

    i-icon
    Chemistry
    1 answer
  • Verified by Alloprof
    ZenMosquito303avatar
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    Postsecondary • 2yr.

    I'm trying to do my chemistry lab and I don't understand how I'm supposed to calculate the pH of a solution using thee ICE table without having the Ka.

    Chemistry
    1 answer
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    ZenShark5377avatar
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    Secondary V • 2yr.

    My chemistry homework question is:

    The combustion of 0.500 g of propane (C3H8) causes a variation of 10.0°C in a calorimeter whose heat capacity is 2.312 kJ/°C. What is the molar heat of combustion of propane?

    Chemistry
    1 answer
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    ZenShark5377avatar
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    Secondary V • 2yr.

    I need help with secondary 5 chemistry homework. Can anyone help me?

    Chemistry
    1 answer
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    YellowGoblin4211avatar
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    Secondary III • 2yr.

    What is the simplest way to explain entropy? Like, what is it and what do people use it for?

    Chemistry
    1 answer
  • Verified by Alloprof
    AlertMosquito8855avatar
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    Secondary V • 2yr.

    I have to find the number of molecules contained in 0.365 moles of caffeine (C8H10N4O2), I need an explanation please!!!

    Chemistry
    1 answer
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    AlertMosquito8855avatar
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    Secondary V • 2yr.

    Hello I have a question to have a better understanding of Boyle-Mariotte's law!

    if the gas pressure doubles, how does the volume vary? and I would like to have the explanation of the answer also please

    thank you

    Chemistry
    1 answer
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    AlertMosquito8855avatar
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    Secondary V • 2yr.

    Good afternoon

    My question is how to calculate the H + ion concentration of the solution ph = 10.70... Could you help me?

    Chemistry
    1 answer
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    NaiveAbafar3712avatar
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    Secondary V • 2yr.

    Based on the molar mass of a gas, what can I say about its speed of diffusion? 

    thank you

    Chemistry
    1 answer
  • Verified by Alloprof
    NaiveAbafar3712avatar
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    Secondary V • 2yr.

    Am I right when I say: "at a given temperature, the kinetic energy of two different gases is the same"

    Chemistry
    1 answer
  • Verified by Alloprof
    NaiveAbafar3712avatar
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    Secondary V • 2yr.

    Hey!

    Is there other combustible gas than CH4 and H2? 

    Thank you, 

    Chemistry
    1 answer
  • Verified by Alloprof
    NaiveAbafar3712avatar
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    Secondary V • 2yr.

    I need to explain why when we look at a laser ray, we can't see its trajectory, but when chalk powder floats in the air in front of it, we can suddenly see the ray. Can anyone help me? Thank you! 

    Chemistry
    1 answer
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    NaiveAbafar3712avatar
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    Secondary V • 2yr.

    At 25 degrees Celcius, the volume of a gas is 4,6L at a pressure of 98 kPa. What will be its volume if we triple its pressure without changing its temperature? 

    Chemistry
    1 answer
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    NaiveAbafar3712avatar
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    Secondary V • 2yr.

    How can I go from Celcius to Kelvin?

    Chemistry
    1 answer
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    TomateSupra7536avatar
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    Secondary IV • 2yr.

    Hello!

    The density of a gas can vary, but why?

    thank you!

    Chemistry
    1 answer
  • Verified by Alloprof
    TomateSupra7536avatar
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    Secondary IV • 2yr.

    Hello, I don’t understand why salt melts ice. Could you explain it to me using the atomic model please?

    Chemistry
    1 answer
  • Verified by Alloprof
    NaiveAbafar3712avatar
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    Secondary V • 2yr.

    True or false - Only endothermic reactions absorb energy.

    Chemistry
    1 answer
  • Verified by Alloprof
    NaiveAbafar3712avatar
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    Secondary V • 2yr.

    Hi,

    Why are we increasing the amount of carbon dioxide in greenhouses?

    Chemistry
    1 answer
  • Verified by Alloprof
    NaiveAbafar3712avatar
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    Secondary V • 2yr.

    Hello, 

    I have the following equation at equilibrium : 

    HF = H+ + F-   Kc = 6,7 x 10^-4

    How do I know if the direct or the indirect reaction is favored?

    Chemistry
    1 answer
  • Verified by Alloprof
    NaiveAbafar3712avatar
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    Secondary IV • 2yr.

    What is the meaning of a negative temperature when using the calorimetry formula (Q=mc△t)?

    Chemistry
    1 answer
  • Verified by Alloprof
    NaiveAbafar3712avatar
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    Secondary V • 2yr.

    Good morning,

    What is the difference between an elastic and an unelastic collision?

    Thank you

    Chemistry
    1 answer
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