Discussion List

Verified by AlloprofSecondary IV • 3yr.
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 AlloprofSecondary IV • 3yr.
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 AlloprofSecondary V • 3yr.
How do I answer this question: how many moles of oxygen are there in 2.25 g of CO2? Thank you!

Verified by AlloprofSecondary IV • 3yr.
Ok, I understand that in an acidbase 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?

Verified by AlloprofSecondary IV • 3yr.
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 AlloprofSecondary IV • 3yr.
Hi!
If a solution is alkaline, is it acidic or basic? Thanksss

Verified by AlloprofSecondary IV • 3yr.
Hi again!
What does “ph is measured on a logarithmic scale” mean ????

Verified by AlloprofSecondary IV • 3yr.
hi!
Why can several pH indicators be used in an experiment? How can the appropriate one be determined? Thank you :))

Verified by AlloprofSecondary IV • 3yr.
Hello,
Could you explain to me what the molar mass is? I can't quite understand.
Thank you so much!

Verified by AlloprofSecondary IV • 3yr.
Helloo, what is the difference between a mole and the Avogadro number?
Thank you!

Verified by AlloprofSecondary IV • 3yr.
Hello,
I have trouble differentiating between exothermic and endothermic reactions according to their enthalpies. Do you have any tips or summaries?

Verified by AlloprofSecondary IV • 3yr.
Hello,
I am having difficulty understanding how the thermal energy formula works. Could you explain to me, please?
Thank you so much!