Chemistry
Ivan Neretin's user avatar
Ivan Neretin's user avatar
Ivan Neretin's user avatar
Ivan Neretin
  • Member for 7 years, 1 month
  • Last seen this week
  • Moscow, Russia
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PhD in physical chemistry.

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All Questions Answers
Score Newest
answer
165
Why is absolute zero unattainable?
Oct 13, 2016
answer
51
Has a carbon compound ever been found having an ionic bond?
Nov 12, 2015
answer
46
What does the circle inscribed in a benzene ring represent?
Feb 25, 2016
answer
41
Is there radioactivity at absolute zero?
Oct 19, 2018
answer
40
Does the mass of sulfur really decrease when dissolved in water and increase when burnt?
Oct 28, 2016
answer
38
What happens to a molecule while it is reacting?
Aug 3, 2016
answer
35
How does water evaporate completely when at room temperature?
Oct 15, 2017
answer
29
Why is the melting point of PCl3 less than that of PCl5?
Dec 11, 2017
answer
29
How can brass still be made even though the crystal structures of zinc and copper are not the same?
Jun 5
answer
27
Gaseous metals?
Nov 16, 2018
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How do you number equations
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25
Let $p_1, p_2,\dots,p_n$ be polynomials of $k$ variables $x_1,\dots,x_k$ and $p_1^2 + \dots +p_n^2=x_1^2 + \dots + x_k^2$ Prove that $n \geq k$.
25
$a_n$ is the smallest positive integer number such that $\sqrt{a_n+\sqrt{a_{n-1}+...+\sqrt{a_1}}}$ is positive integer
20
Choose $3n$ points on a circle, show that there are two diametrically opposite point
17
Identify $C\approx1.29$ the limit of $\left(\pi - 2^n \sqrt{2-\sqrt{2+\cdots+\sqrt 2}}\right)\cdot 4^n$
12
solve this diophantine equation: ${\rm lcm}[x,y]+{\rm lcm}[y,z]+{\rm lcm}[z,x]=3(x+y+z)$

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