User Ivan Neretin - Chemistry Stack Exchange

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Ivan Neretin

PhD in physical chemistry.

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Moscow, Russia
Member for 5 years, 8 months
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24 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 $n \geq k$.
21 $a_n$ is the smallest positive integer number such that $\sqrt{a_n+\sqrt{a_{n-1}+...+\sqrt{a_1}}}$ is positive integer
19 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: ${\rm lcm}[x,y]+{\rm lcm}[y,z]+{\rm lcm}[z,x]=3(x+y+z)$
11 Show that there are no integers $x, y$ such that $x^{2015} - y^{2016} = 2115$
11 $\frac{2}{3} \cdot \frac{5}{6} \cdot \frac{8}{9} \cdot ... \cdot \frac{995}{996} \cdot \frac{998}{999}$ and $0.1$ which is bigger?
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physical-chemistry

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bond

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153 Why is absolute zero unattainable? Oct 13 '16

50 Has a carbon compound ever been found having an ionic bond? Nov 12 '15

46 What does the circle inscribed in a benzene ring represent? Feb 25 '16

41 Is there radioactivity at absolute zero? Oct 19 '18

39 Does the mass of sulfur really decrease when dissolved in water and increase when burnt? Oct 28 '16

38 What happens to a molecule while it is reacting? Aug 3 '16

35 How does water evaporate completely when at room temperature? Oct 15 '17

28 Why is the melting point of PCl3 less than that of PCl5? Dec 11 '17

24 Can single molecules of C and O2 react in isolation, and if so how will momentum be conserved? Sep 14 '20

24 Gaseous metals? Nov 16 '18

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