Skip to content

Spruce Up Your Study Space contest

Ask a school-related question in the Help Zone and you could win a $350 prize. See the details

See the details

Help Zone

Chemistry

{t c="richEditor.description.title"} {t c="richEditor.description.paragraphMenu"} {t c="richEditor.description.inlineMenu"} {t c="richEditor.description.embed"}

Discussion List

  • Verified by Alloprof
    ZenShark5377avatar
    Verified by Alloprof
    Secondary V • 1yr.

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

    A2FD3D51-A13B-4BA8-A91D-21F9CD5DB79D.jpeg
  • Verified by Alloprof
    ZenShark5377avatar
    Verified by Alloprof
    Secondary V • 1yr.

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

    C75D217B-5F7B-48B5-B6C8-E07AB34F809D.jpeg
  • Verified by Alloprof
    ZenMosquito303avatar
    Verified by Alloprof
    Postsecondary • 1yr.

    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.

  • Verified by Alloprof
    ZenShark5377avatar
    Verified by Alloprof
    Secondary V • 1yr.

    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?

  • Verified by Alloprof
    ZenShark5377avatar
    Verified by Alloprof
    Secondary V • 1yr.

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

  • Verified by Alloprof
    YellowGoblin4211avatar
    Verified by Alloprof
    Secondary III • 2yr.

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

  • Verified by Alloprof
    AlertMosquito8855avatar
    Verified by Alloprof
    Secondary V • 2yr.

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

  • Verified by Alloprof
    AlertMosquito8855avatar
    Verified by Alloprof
    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

  • Verified by Alloprof
    AlertMosquito8855avatar
    Verified by Alloprof
    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?

  • Verified by Alloprof
    NaiveAbafar3712avatar
    Verified by Alloprof
    Secondary V • 2yr.

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

    thank you

  • Verified by Alloprof
    NaiveAbafar3712avatar
    Verified by Alloprof
    Secondary V • 2yr.

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

  • Verified by Alloprof
    NaiveAbafar3712avatar
    Verified by Alloprof
    Secondary V • 2yr.

    Hey!

    Is there other combustible gas than CH4 and H2? 

    Thank you, 

  • Verified by Alloprof
    NaiveAbafar3712avatar
    Verified by Alloprof
    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! 

  • Verified by Alloprof
    NaiveAbafar3712avatar
    Verified by Alloprof
    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? 

  • Verified by Alloprof
    NaiveAbafar3712avatar
    Verified by Alloprof
    Secondary V • 2yr.

    How can I go from Celcius to Kelvin?

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

    Hello!

    The density of a gas can vary, but why?

    thank you!

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

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

  • Verified by Alloprof
    NaiveAbafar3712avatar
    Verified by Alloprof
    Secondary V • 2yr.

    True or false - Only endothermic reactions absorb energy.

  • Verified by Alloprof
    NaiveAbafar3712avatar
    Verified by Alloprof
    Secondary V • 2yr.

    Hi,

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

  • Verified by Alloprof
    NaiveAbafar3712avatar
    Verified by Alloprof
    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?

  • Verified by Alloprof
    NaiveAbafar3712avatar
    Verified by Alloprof
    Secondary IV • 2yr.

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

  • Verified by Alloprof
    NaiveAbafar3712avatar
    Verified by Alloprof
    Secondary V • 2yr.

    Good morning,

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

    Thank you

  • Verified by Alloprof
    NaiveAbafar3712avatar
    Verified by Alloprof
    Secondary V • 2yr.

    Hi Alloprof, 

    Do gas particles still have kinetic energy below 0 degrees Celcius?

  • Verified by Alloprof
    NaiveAbafar3712avatar
    Verified by Alloprof
    Secondary V • 2yr.

    Hello,

    What is the normal atmospheric pressure?

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

    I don't understand how to solve this problem:

    The atomic mass of isotope # 1 of element Ab is 73 au. The atomic mass of isotope # 2 of the element Ab is 76 au. The atomic mass of isotope # 3 of the element Ab is 74 au. The relative frequencies of each isotope are 10%, 80% and 10%, respectively.

    Find the average atomic mass.

    Thank you!

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

    What is the periodicity of properties?

  • Verified by Alloprof
    NaiveAbafar3712avatar
    Verified by Alloprof
    Secondary IV • 2yr.

    Emilie suffers from diabetes. Therefore, after having lunch, traces of glucose (C6H12O6) can be found in her blood. What is the total mass of sugar that can be found in her blood before it reaches a concentration of 10 mmol / L? (hint: volume of blood = 5L)

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

    How do you distinguish between metals, nonmetals and metalloids in the periodic table?

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

    Hi!

    I have an exercise that asks me to determine the mass of sodium hydroxide (NaOH) in a basic solution by titrating it with a 1.8 mol / L acidic solution. The titration shows a neutralization volume of 30 mL for the acid and an initial volume of 20 mL for the base. I am not sure how to find the mass.

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

    Hi!

    I'm not sure if I understand how a titration can help us to know the concentration of a solution ... Can someone explain it to me please?

    Thank you very much in advance!

Ask a question