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1500 questions
14
votes
2 answers
Which has the largest bond angle between water, oxygen difluoride and dichlorine oxide?
Which one out of $\ce{H2O}, \ce{Cl2O}, \&\ \ce{F2O}$ will have largest bond angle?
I think it should be $\ce{H2O}$ because oxygen is most electronegative in this case so electrons will be more towards oxygen hence increasing bond angle, but the…
user354545
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6 answers
Why don't metals form covalent bonds in bulk metal?
I really don't understand why metals form metallic bonds. I mean, it makes no sense. It would make much more sense for them to form covalent bonds with themselves and have a 'pseudo-full' outer shell. How does freeing off electrons make them any…
Gerard
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14
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2 answers
Why is O2 the supporter of combustion?
It's there in every high-school textbook: $\ce{O2}$ is the supporter of combustion. Without $\ce{O2}$ combustion cannot take place. Why? And why only $\ce{O2}$? Why not some other element?
And, what happens when a combustible gas burns in air? Say…
Gerard
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14
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4 answers
What does it mean to shift equilibrium?
What does it mean to shift a chemical equilibrium? For example,
the equilibrium shifts to the left …
I don't understand that.
jaykirby
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14
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1 answer
Reviving Li-ion battery in freezer?
I have read that it is possible to revive a dead Li-ion battery by putting it in the freezer for three to seven days, then letting it get back to room temperature.
Can this process work, and if so, how does it work?
Notes:
Somehow the opposite,…
feklee
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14
votes
1 answer
In Hückel's rule, can n be any integer?
Hückel's rule says that any planar compound with a ring of conjugated p orbitals with $4n+2$ electrons is aromatic. Here, can $n$ be any integer, or does $n$ have to be related to the number of p orbitals in the conjugated π system (as shown in the…
carbenoid
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14
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1 answer
Receiving milk for working in harmful environment
I just got a job in a chemical/biological lab (post-Soviet Country). Chemists here receive milk for "harmfulness of the work" (i .e. their work involves working with all kind of substances/reactives). I'm not a chemist; I do their analysis. The…
mil'
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14
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2 answers
Why are the densities of europium and ytterbium anomalously low?
Why do europium and ytterbium have lower densities than expected in comparison to other lanthanides? I know it has something to do with the fact that they have half-full and full 4f subshells in the +2 oxidation state, but how exactly does it relate…
waterlemon
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14
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1 answer
Does aromaticity require a co-planar pi system?
It's well established that angular twisting can decrease the degree of delocalization across a $\pi$ system (e.g. biphenyl).
Moreover, there's considerable debate about aromaticity in spherical species like $\ce{C_{60}}$.
So let's ask a naive…
Geoff Hutchison
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14
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2 answers
How is volatility useful in the production of acids?
Sulfuric acid because of its low volatility can be used to manufacture more volatile acids from their corresponding salts.
How does volatility affect the production of acids? Isn't it that sulfuric acid being stronger than the salt of weak acid…
JM97
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14
votes
3 answers
What is the difference between ΔG and ΔrG?
Consider the reaction
$$\ce{A -> B}$$
The reaction Gibbs free energy, $\Delta_\mathrm{r} G$ is given by the following equation
$$\Delta_\mathrm{r} G = \Delta_\mathrm{r} G^\circ + RT \ln Q$$
Now what is the difference between $\Delta G$ and…
CLAP or SLAP II
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14
votes
1 answer
Bonding in Square Antiprismatic Compounds
Both $\ce{IF_8^-}$ and $\ce{XeF_8^{2-}}$ have (distorted) square antiprismatic geometries.
I've been wondering how to explain the bonding in such compounds. Hypercoordinate bonding (as used to explain the bonding in $\ce{PCl_5}$, for example)…
ron
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14
votes
3 answers
Is poison still poisonous after its 'expiration date'?
As we all know that,
Any poison is nothing but a chemical compound.
And as discussed in the question: Chemicals-do-have-an-expiry-date!
So, my question is: Is poison still poisonous after its 'expiration date'? and Is every poison always as…
ABcDexter
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14
votes
3 answers
Why stepwise dissociation for acids but not hydroxide bases?
My son asked this over the weekend and I didn't have a good answer: how come with polyprotic acids we assume that the release of each $\ce{H+}$ is progressively harder, but with bases like $\ce{Ca(OH)2}$ we write $\ce{Ca^2+}$ and $\ce{2OH-}$ as the…
HappyHuman
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14
votes
1 answer
Can H4O 2+ form?
Like $\ce{NH4+}$ ,Is there any possibility of formation of $\ce{H4O^{2+}}$ (of tetrahedral structure)?
My theory is: it can be formed by osmosis setup where heavy acids like $\ce{H3PO4}$ or $\ce{H2S2O7}$ are passed through a semipermeable membrane…
Swastik
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