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Chemistry

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Discussion List

  • Verified by Alloprof
    TomateSupra7536avatar
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    Secondary IV • 2yr.

    Hi! I'm not sure I understand how pH works.

    Is the higher, the more acidic?

    And if for example I have a solution with a pH of 4 and another with a pH of 8, is the second solution twice as acidic as the first?

    Thank you for your help!!

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    TomateSupra7536avatar
    Verified by Alloprof
    Secondary IV • 2yr.

    I have a hard time understanding how why ° C is used in the thermal energy equation Q = m * c * delta T. In many chemistry exercises, we have to use Kelvin. Thank you

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    FairTangerine2097avatar
    Verified by Alloprof
    Secondary IV • 2yr.

    Hello,

    I have a hard time understanding how an acid-base neutralization is done in a lab. Could you explain it to me please?

    Thank you so much!

  • Verified by Alloprof
    FairTangerine2097avatar
    Verified by Alloprof
    Secondary IV • 2yr.

    How do the different characteristics of the elements change in the periodic table?

  • Verified by Alloprof
    FairTangerine2097avatar
    Verified by Alloprof
    Secondary IV • 2yr.

    Hello, I do not understand the principle of a titration

  • Verified by Alloprof
    TomateSupra7536avatar
    Verified by Alloprof
    Secondary IV • 2yr.

    Hi, I don't understand half life ???

  • Verified by Alloprof
    SkillfulGrasshopper3789avatar
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    Secondary IV • 2yr.

    Hello! I'm not sure if the Q in Q = m * c * ∆T means the heat or thermal energy?

    Also, when is the Q positive and negative?

    Thanks in advance :)

  • Verified by Alloprof
    TomateSupra7536avatar
    Verified by Alloprof
    Secondary IV • 2yr.

    Hello,

    Could you explain to me what are the differences between the families of the periodic table please?

    Thank you so much!

  • Verified by Alloprof
    TomateSupra7536avatar
    Verified by Alloprof
    Secondary IV • 2yr.

    Hello!

    Can 2 elements have the same atomic number? Thank you :)

  • Verified by Alloprof
    TomateSupra7536avatar
    Verified by Alloprof
    Secondary IV • 2yr.

    Hello!

    I was wondering, is there a particular order in the periodic table? Because from left to right and from top to bottom the number in the box starts from 1 and goes up, but does this number mean something or is it a reference number that has been set randomly? Thanks for your time :))

  • Verified by Alloprof
    TomateSupra7536avatar
    Verified by Alloprof
    Secondary IV • 2yr.

    Hi!

    I was reviewing and trying to remember how to find the number of protons, electrons and neutrons in an atom? (I will put an example below) Thank you !!!


    $$ _{92}^{235}U $$

  • Verified by Alloprof
    SkillfulGrasshopper3789avatar
    Verified by Alloprof
    Secondary V • 2yr.

    How do I answer this question: how many moles of oxygen are there in 2.25 g of CO2? Thank you!

  • Verified by Alloprof
    SkillfulGrasshopper3789avatar
    Verified by Alloprof
    Secondary IV • 2yr.

    Ok, I understand that in an acid-base neutralization, we mix an acid and a base in a solution, but I don't understand how the pH becomes neutral again after ...? Can you explain this to me please?

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    SkillfulGrasshopper3789avatar
    Verified by Alloprof
    Secondary IV • 2yr.

    Hello again :)

    Ok if I have a solution where I have to use colorimetric indicators, how do I use several at the same time to know the pH approximately? Do I simply combine them?


    thank you

  • Verified by Alloprof
    SkillfulGrasshopper3789avatar
    Verified by Alloprof
    Secondary IV • 2yr.

    Hi!

    If a solution is alkaline, is it acidic or basic? Thanksss

  • Verified by Alloprof
    SkillfulGrasshopper3789avatar
    Verified by Alloprof
    Secondary IV • 2yr.

    Hi again!

    What does “ph is measured on a logarithmic scale” mean ????

  • Verified by Alloprof
    SkillfulGrasshopper3789avatar
    Verified by Alloprof
    Secondary IV • 2yr.

    hi!


    Why can several pH indicators be used in an experiment? How can the appropriate one be determined? Thank you :))

  • Verified by Alloprof
    FairTangerine2097avatar
    Verified by Alloprof
    Secondary IV • 2yr.

    Hello,

    Could you explain to me what the molar mass is? I can't quite understand.

    Thank you so much!

  • Verified by Alloprof
    FairTangerine2097avatar
    Verified by Alloprof
    Secondary IV • 2yr.

    Helloo, what is the difference between a mole and the Avogadro number?

    Thank you!

  • Verified by Alloprof
    FairTangerine2097avatar
    Verified by Alloprof
    Secondary IV • 2yr.

    Hello,

    I have trouble differentiating between exothermic and endothermic reactions according to their enthalpies. Do you have any tips or summaries?

  • Verified by Alloprof
    FairTangerine2097avatar
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    Secondary IV • 2yr.

    Hello,

    I am having difficulty understanding how the thermal energy formula works. Could you explain to me, please?

    Thank you so much!

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