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2 votes

How do I derive metallic aluminum without electricity?

One method, which would also require a non-electrical heating source, involves reduction with carbon. Given a high enough temperature -- meaning over 2000°C -- carbon carries off the oxygen as carbon ...
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1 vote

Why is is that tellurium(VI) fluoride is completely hydrolysed but iodine(III) fluoride isn't, even in hot water?

Why not? Tellurium hexafluoride also goes through an intermediate: The hydrolysis of tellurium hexafluoride produces the fluoroorthotelluric acids, $\ce{TeF_n(OH)_{6–n}}$, n= 1–4, which undergo ...
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0 votes
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Two solutions for balancing a chemical equation?

All your equations are correctly written. But look ! The simplest equation would be $\ce{N2H4 + 2 H2O2 -> N2 + 4 H2O}$. But plenty of other acceptable equations can be obtained by adding an ...
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1 vote

Why should I use thioacetamide instead of H2S when trying to separate cations from the H2S-group of cations?

$\ce{H2S}$ is a gas which is an ideal choice for carrying out qualitative analysis of cations in the beginning chemistry laboratory. It makes fine precipitates, easy to filtrate quantitatively. It has ...
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4 votes

Why is CO2 not in the C∞v point group?

It will be easier to understand by giving an example of molecules: $D_{\infty h} \to \ce{CO_2}$, $C_{\infty v} \to \ce{HCN}$. Both are linear molecules, however $\ce{CO_2}$ has an inversion, $\ce{HCN}$...
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-1 votes

Why are some chemical reactions reversible when we generally call all chemical changes as irreversible and permanent? (I am new to this subject.)

A chemical reaction is reversible when and if it reaches chemical equilibrium; [A steady state can possibly be a close approximation.] This is almost restricted to simple, elementary reactions that ...
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0 votes

Why are some chemical reactions reversible when we generally call all chemical changes as irreversible and permanent? (I am new to this subject.)

The statement you challenge is a gross oversimplification and generalisation that fails to capture much of the subtlety of chemical reactions. It seems to be pitched at describing the difference ...
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2 votes

Why are some chemical reactions reversible when we generally call all chemical changes as irreversible and permanent? (I am new to this subject.)

I am actually pretty old to this subject and still I cannot really answer, because the boundary between physical changes and chemical reactions is indistinct. Essentially anything that involves ...
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-1 votes

Why are some chemical reactions reversible when we generally call all chemical changes as irreversible and permanent? (I am new to this subject.)

All chemical reactions are reversible. But the back reaction may be extremely improbable. For exemple the combustion of hydrocarbons produces $\ce{CO2}$ and $\ce{H2O}$. But if you mix and heat a ...
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6 votes
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Does zinc oxide lose its UV blocking properties when mixed with oil?

$\ce{ZnO}$ is not soluble in oils. But it can form dispersion in oils. $\ce{ZnO}$ may react with traces of fatty acids in oils, forming respective zinc salts. But for UV screening context, it is ...
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5 votes

Cant figure out whether Lithium or Strontium is in my substance?

Lithium produces a red purple flame with only one big line in the spectrum. Strontium produces an orange flame with plenty of lines in the red, orange, yellow and green region of the spectrum. Lithium ...
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0 votes

Does manganese reacts with water at "not" standard conditions?

thank you for the excellent question. It was really thought provoking indeed. Here's the answer : Yes, it (Manganese) reacts with water. As Concise Inorganic Chemistry by J.D.LEE states it reacts ...
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-1 votes

CFSE for octahedral complexes with more than one type of ligands

When more than one type of ligands are present with some being SFL and others being WFL then, the final effect of those ligands dominate which are greater in number. So, in the given compound, ammonia ...
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5 votes
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What is the hybridization of oxygen atoms in boric acid?

All three oxygen atoms backdonate a π-electron pair and thus they are all $\mathrm{sp^2}$. When you construct the molecular orbitals, you find that the π orbitals are as follows: One orbital bonds ...
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3 votes

How to synthesize sodium metabisulfite?

Wikipedia is a good start. When you treat a solution of suitable base, say sodium hydroxide or sodium bicarbonate with sulfur dioxide, you get sodium bisulfite. $$\ce{SO2 + NaOH → NaHSO3}$$ $$\ce{SO2 +...
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1 vote

Citric acid rust removal and neutralization

After removing a part from an acid solution bath, it should have no trace of the acid left on it, otherwise, it will rust quickly and aggressively. Depending on the strength of the acid, it can happen ...
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3 votes

Why do Cp2Mg and NaCp complexes turn pink when oxidized?

With highly electroposive metals we may treat the cyclopentadienyl as being essentially an anion, $\ce{C5H5^-}$. When this is oxidized to form the radical, an extra electronic vacancy is opened up in ...
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