instruction stringlengths 15 21.8k |
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> Which change will decrease the rate of the reaction between
> $\ce{I2(s)}$ and $\ce{H2(g)}$?
>
>
> (A) Increasing the partial pressure of $\ce{H2(g)}$
>
> (B) Adding the $\ce{I2(s)}$ as one piece rather than as several small ones
>
> (C) Heating the reaction mixture
>
> (D) Adding a catalyst for the... |
Decreasing rate of reaction between $\ce{I2(s)}$ and $\ce{H2(g)}$? |
If you view the titration curve for $V_{added}$ vs $pH$:
<img src="http://www.mikeblaber.org/oldwine/chm1046/notes/AddAqEq/Titrate/Image1.gif" alt="" />
you can see that the equivalence point occurs at $pH$ = 7.
Phenolphthalein is fuchsia from $pH$s roughly between 10 and 13, and is colorless below 8.2. When t... |
If you view the titration curve for $V_{added}$ vs $pH$:
<img src="http://www.mikeblaber.org/oldwine/chm1046/notes/AddAqEq/Titrate/Image1.gif" alt="" />
you can see that the equivalence point occurs at $pH$ = 7.
Phenolphthalein is fuchsia from $pH$s roughly between 8.2 and 12, and is colorless below 8.2. When ... |
If you view the titration curve for $V_{added}$ vs $pH$:
<img src="http://www.mikeblaber.org/oldwine/chm1046/notes/AddAqEq/Titrate/Image1.gif" alt="" />
you can see that the equivalence point occurs at $pH$ = 7.
Phenolphthalein is fuchsia from $pH$s roughly between 8.2 and 12, and is colorless below 8.2. When ... |
non-pure alkanes, .. have a taste .. (as far as I know, is it wrong or true?) but ..
Are all pure alkanes, .. tasteless ..? |
Are all (pure) alkanes, alkenes and alkynes - tasteless, odourless and colourless? |
> The boiling points of $\ce{CH3COCH3}$, $\ce{CH3COC2H5}$, and $\ce{CH3COC3H7}$ are $56˚C$,
> $80 ˚C$, and $102 ˚C$, respectively. What factor(s) best account(s) for this?
I believe london dispersion forces is one of them. Is dipole-dipole interactions another one? It seems to me that there *are* dipole-dipole in... |
Which factors best account for the increase in boiling point? |
Why do only unsaturated hydrocarbons undergo addition reactions? For example, ethene or ethyne will undergo an addition reaction with chlorine, whereas ethane will not.
Further, why does benzene not undergo addition reactions, even though it is not saturated? |
Why do only unsaturated hydrocarbons undergo addition reactions? |
I just learned about rate and order... I just want to confirm if these three ideas are correct:
1. If the first elementary step is the slow step, will the stoichiometric coefficients of the reactants in the rate determining step (RDS) be EQUAL to the order the concentration of the reactants in the rate equation is r... |
If you view the titration curve for $V_{added}$ vs $pH$:
<img src="http://www.mikeblaber.org/oldwine/chm1046/notes/AddAqEq/Titrate/Image1.gif" alt="" />
you can see that the equivalence point occurs at $pH$ = 7.
Phenolphthalein is fuchsia from $pH$s roughly between 8.2 and 12, and is colorless below 8.2. When ... |
To what would you add given a saturated hydrocarbon? You must substitute, abstract, or displace.
Benzene is aromatic - different pattern of reactivity. It photochlorinates. It UV reacts with maleic anhydride, then adds another mole thermally. Palladium catalysis will swap appropriate substituents.
|
What are the products of the reaction KOCN + C + heat. I'm guessing some of the nitrogen is lost and forms something. I'm trying to find out the full equation, but a google search brings up nothing concerning reduction of potassium cyanate with carbon.
This is the OP (sorry not sure how to log-in, was guest post):
... |
Why would a **mixture** of two odourless alkanes have an odour?
As already pointed out by *Greg E* and *Uncle Al*, numerous hydrocarbons without any (heteroatom-based) functional groups do show characteristic smells.
Naphthalene is always remembered for the typical smell of grandma's mothballs.
More pleasant s... |
#The "classical" way
![enter image description here][1]
Direct addition of $\ce{H-X}$ to alkenes proceeds via the addition of a proton to the $\ce{C=C}$ double bond in the initial step, i.e via a carbocation. This works nicely for strong mineral acids, but not for the weak acid $\ce{HCN}$ with the rather weak nucle... |
#The "classical" way
![enter image description here][1]
Direct addition of $\ce{H-X}$ to alkenes proceeds via the addition of a proton to the $\ce{C=C}$ double bond in the initial step, i.e via a carbocation. This works nicely for strong mineral acids, but not for the weak acid $\ce{HCN}$ with the rather weak nucle... |
Why would a **mixture** of two odourless alkanes have an odour?
As already pointed out by *Greg E* and *Uncle Al*, numerous hydrocarbons without any (heteroatom-based) functional groups do show characteristic smells.
Naphthalene is always remembered for the typical smell of grandma's mothballs.
More pleasant s... |
If the pKa of Glycerol is 14.15. How do you calculate the pH for it?
I assume that the Henderson-Hasselbalch derivative that works for weak acids and bases is not applicable here. |
I just learned about rate and order... I just want to confirm if these three ideas are correct:
1. If the first elementary step is the slow step, will the stoichiometric coefficients of the reactants in the rate determining step (RDS) be EQUAL to the order the concentration of the reactants in the rate equation is r... |
I made I high pressurized $MoS_2$ pellet, using a 6 ton pressurizer. I used very thin powder to create the pellet.
I am using this pellet on beam, with some nuclear techniques. In my spectra I can see oxygen.
How easy it is for $MoS_2$ to become oxidized? |
I made I high pressurized $\ce{MoS2}$ pellet, using a 6 ton pressurizer. I used very thin powder to create the pellet.
I am using this pellet on beam, with some nuclear techniques. In my spectra I can see oxygen.
How easy it is for $\ce{MoS2}$ to become oxidized? |
Why do we typically take $n^2$ scans, even in the basic NMR experiment? I've heard various explanations, including that it helps the fast Fourier transform, and would like to know the real reason. |
Why are NMR typically taken for a power of 2 scans? |
E-liquids are blends of nicotine, propylene glycol, vegetable glycerin, and aroma.
I need to develop a method for determining the concentration of nicotine in a vial.
(to verify if the information listed on the bottle are correct.)
Does anyone have any idea how to proceed?
|
In Gallium Arsenide ($\ce{GaAs}$) the Gallium atom has an oxidation state of $\ce{+3}$ and the Arsenic atom has an oxidation state of $\ce{-3}$.
$\ce{Ga5As3}$ can't exist because here you suppose that arsenic has an oxidation state of $\ce{-5}$, what isn't correct : Arsenic can only have a positive $\ce{+5}$ charge... |
I need help with this one homework question. I am combining $100\,\text{mL}$ of $0.5\,\text{M}$ $\ce{HCl}$ and $100\,\text{mL}$ of $0.5\,\text{M}$ $\ce{NaOH}$ to obtain $200\,\text{mL}$ of $0.25\,\text{M}$ $\ce{NaCl}$. The change in temperature of this reaction was $\Delta T=3.38^OC$. I have to calculate the heat of re... |
I need help with this one homework question:
I am combining $100\,\text{mL}$ of $0.5~\text{M}~\ce{HCl}$ and $100~\text{mL}$ of $0.5~\text{M}~\ce{NaOH}$ to obtain $200~\text{mL}$ of $0.25~\text{M}~\ce{NaCl}$. The change in temperature of this reaction was $\Delta \vartheta =3.38~\text{°C}$. I have to calculate the ... |
**Does this also work with compounds other than only ionic compounds?** Yes - take a look at this : in water hydrogen has a ($\ce{+I}$) partially positive oxidation state and oxygen has a ($\ce{-II}$) partially negative oxidation state. So if you work out the rule then you get : $\ce{H2O1}$ (and you can leave the 1 awa... |
Two things are wrong in your calculation. Well, it's really just one thing, but the other one bugs me more.
1. The total mass of the solution.
2. Units.
1. Mass of the Solution
----
To calculate the mass of the total solution, I think it is fair to make the following assumption:
$$ \rho_\ce{HCl} \approx \... |
Today, in class, I learned about the two reactions.
I know connecting bond releases energy, and breaking it requires and aborb/ consumes energy.
But on my reference table I, 2C+H2 yielding C2H2 realeasing 227.4 kJ of energy. My point is why it releases energy? Also, where the activation energy comes from?
The pa... |
> For which pair of species is the difference in radii the
greatest?
>
>(A) $\ce{Li}$ and $\ce{F}$
>
>(B) $\ce{Li+}$ and $\ce{F^-}$
>
>(C) $\ce{Li+}$ and $\ce{O^2-}$
>
>(D) $\ce{O^2-}$ and $\ce{F^-}$
I am pretty sure it is not (D) as $\ce{O^2-}$ and $\ce{F^-}$ are quite close to each other on the per... |
For which pair of species is the difference in radii the greatest? |
> Which element has the greatest electrical conductivity?
(A) As (B) Ge (C) P (D) Sn
I am unsure of how to approach this problem. Is there some sort of trend for electrical conductivity or some other method to determine which of these answers the question?
I am pretty sure it is not Ge as that is used for s... |
Trends for electrical conductivity? |
![][1]
Why is the above structure not considered a valid structure for the nitrate ion? Is it because adding a double bond reduces the formal charges present on the nitrogen? Does the above form exist anywhere?
[1]: https://i.stack.imgur.com/y0cDk.png |
Structure for nitrate ion? |
To determine the silica (SiO2) content in Portland cement by gravimetric analysis it is digested in HCl and the silica residue is eventually measured.
The chief constituents are Ca2SiO4 (or 2CaO.SiO2), 4CaO.Al2O3.Fe2O3, Ca3(AlO3)2 (or 3CaO.Al2O3), and CaSiO3 (or CaO.SiO2). Gypsum is also present. What species are pr... |
I've read that in kolbe's reaction of phenol, I.e. reaction of phenol with $NaOH$ forming sodium phenoxide,followed by reaction with $CO_2$ and acidification; salicylic acid (2-hydroxybenzoic acid) is formed.But when $KOH$ is used instead of $NaOH$, 4-hydroxybenzoic acid is formed.
I don't understand why two diffe... |
Why isn't 4-hydroxybenzoic acid formed along with salicylic acid in kolbe's reaction? |
I've read that in kolbe's reaction of phenol, I.e. reaction of phenol with $\ce{NaOH}$ forming sodium phenoxide,followed by reaction with $\ce{CO_2}$ and acidification; salicylic acid (2-hydroxybenzoic acid) is formed.But when $\ce{KOH}$ is used instead of $\ce{NaOH}$, 4-hydroxybenzoic acid is formed.
I don't unde... |
To determine the silica ($\ce{SiO2}$) content in Portland cement by gravimetric analysis it is digested in $\ce{HCl}$ and the silica residue is eventually measured.
The chief constituents are $\ce{Ca2SiO4}$ (or $\ce{2CaO.SiO2}$), $\ce{4CaO.Al2O3.Fe2O3}$, $\ce{Ca3(AlO3)2}$ (or $\ce{3CaO.Al2O3}$), and $\ce{CaSiO3}$ (o... |
>I am unsure of how to approach this problem.
No, you are not! You have already reduced the number of candidates by good reasoning!
At this point, one
- *could* have a look at conductivity tables or remember in which period the metal blocks start for every main group or
- **remember typical electricity-relat... |
**Does this also work with compounds other than only ionic compounds?** Yes - take a look at this : in water hydrogen has a ($\ce{+I}$) partially positive oxidation state and oxygen has a ($\ce{-II}$) partially negative oxidation state. So if you work out the rule then you get : $\ce{H2O1}$ (and you can leave the 1 awa... |
For a lab assignment, I combined 10mL of 1M sodium sulfate solution with 10mL of 1M calcium chloride solution. The ionic equation I came up with is:
$$\ce{2Na^+ (aq) + SO4^2- (aq) + Ca^2+ (aq) + 2Cl^- (aq) -> CaSO4(s) + 2Na^+ (aq) + 2Cl^- (aq)}$$
I was then asked in a lab question the following:
>If the reacti... |
What is a complete reaction? |
I've read that in kolbe's reaction of phenol, i.e. reaction of phenol $(\ce {C6H5OH})$ with $\ce{NaOH}$ forming sodium phenoxide $(\ce {C6H5O^{-}Na^{+}})$,followed by reaction with $\ce{CO_2}$ and acidification; salicylic acid (2-hydroxybenzoic acid ) is formed.But when $\ce{KOH}$ is used instead of $\ce{NaOH}$, 4-hydr... |
I've read that in kolbe's reaction of phenol, i.e. reaction of phenol $(\ce {C6H5OH})$ with $\ce{NaOH}$ forming sodium phenoxide $(\ce {C6H5O^{-}Na^{+}})$, followed by reaction with $\ce{CO_2}$ and acidification; salicylic acid (2-hydroxybenzoic acid ) is formed. But when $\ce{KOH}$ is used instead of $\ce{NaOH}$, 4-hy... |
For a lab assignment, I combined 10mL of 1M sodium sulfate solution with 10mL of 1M calcium chloride solution. The ionic equation I came up with is:
$$\ce{2Na^+ (aq) + SO4^2- (aq) + Ca^2+ (aq) + 2Cl^- (aq) -> CaSO4(s) + 2Na^+ (aq) + 2Cl^- (aq)}$$
I was then asked in a lab question the following:
>If the reacti... |
I think the contradiction you mention in your question is only apparent and is due to a misunderstanding around the word **valency**, which is by itself a rather ambiguous term ([valency vs oxidation state][1]).
According to [Wikipedia][2], valency yields the number of bonds an element tends to have. For instance, o... |
I think the contradiction you mention in your question is only apparent and is due to a misunderstanding around the word **valency**, which is by itself a rather ambiguous term ([valency vs oxidation state][1]).
According to [Wikipedia][2], valency yields the number of bonds an element tends to have. For instance, o... |
I think the contradiction you mention in your question is only apparent and is due to a misunderstanding around the word **valency**, which is by itself a rather ambiguous term ([valency vs oxidation state][1]).
According to [Wikipedia][2], valency yields the number of bonds an element tends to have. For instance, o... |
Let's start straight away. In [this](http://books.google.co.in/books?id=32RJvfgkJgwC&q=GaAs#v=snippet&q=GaAs&f=false) book on page 4 Gallium arsenide's bond structure is shown like this:
$As$ is shown making $5$ covalent bonds.
Recently I came across [this](http://bo... |
http://books.google.com/books?id=VeXQAAAAMAAJ&pg=PA2&lpg=PA2&dq=Gravimetric+Analysis+of+Portland+Cement+%22aluminum <BR>
Copy whole URL. Page 2 for clickable index, then page 18. <BR>
DOI: 10.1039/AN9709500051
Digest it in "strong" HCl (tough lab for employment, worse if you service the fume hoods). Everything ex... |
For a lab assignment, I combined 10mL of 1M sodium sulfate solution with 10mL of 1M calcium chloride solution. The ionic equation I came up with is:
$$\ce{2Na^+ (aq) + SO4^2- (aq) + Ca^2+ (aq) + 2Cl^- (aq) -> CaSO4(s) + 2Na^+ (aq) + 2Cl^- (aq)}$$
I was then asked in a lab question the following:
>If the reacti... |
For a lab assignment, I combined 10mL of 1M sodium sulfate solution with 10mL of 1M calcium chloride solution. The ionic equation I came up with is:
$$\ce{2Na^+ (aq) + SO4^2- (aq) + Ca^2+ (aq) + 2Cl^- (aq) -> CaSO4(s) + 2Na^+ (aq) + 2Cl^- (aq)}$$
I was then asked in a lab question the following:
>If the reacti... |
Let's start straight away. In [this](http://books.google.co.in/books?id=32RJvfgkJgwC&q=GaAs#v=snippet&q=GaAs&f=false) book on page 4 Gallium arsenide's bond structure is shown like this:
$As$ is shown making $5$ covalent bonds.
Recently I came across [this](http://bo... |
I think the contradiction you mention in your question is only apparent and is due to a misunderstanding around the word **valency**, which is by itself a rather ambiguous term ([valency vs oxidation state][1]).
According to [Wikipedia][2], valency yields the number of bonds an element tends to have. For instance, o... |
In case of small molecules like water things are more or less clear, but when I see a large complex molecule like [Thyroid Hormone][1] - how should I find out that this molecule is non-polar?
[1]: http://en.wikipedia.org/wiki/Thyroid_hormone |
How to determine polarity in large molecules? |
##What is the logic behind this method, how to prove this method?
The logic of the method is in fact very very simple. Suppose you have the equation:
$$\ce{xA^{a} + yB^{b} -> A_{x}B_{y}}$$
Where $a$ and $b$ are oxidation number $ \in \mathbb{Z}$ that have opposite sings, $A$, $B$ chemical species and $x$, $y$ s... |
##What is the logic behind this method, how to prove this method?
The logic of the method is in fact very very simple. Suppose you have the equation:
$$\ce{xA^{a} + yB^{b} -> A_{x}B_{y}}$$
Where $a$ and $b$ are oxidation numbers $ \in \mathbb{Z}$ that have opposite sings, $A$, $B$ chemical species and $x$, $y$ ... |
##What is the logic behind this method, how to prove this method?
The logic of the method is in fact trivial. Suppose you have to write a compound knowing his oxidation numbers :
$$\ce{xA^{a} + yB^{b} -> A_{x}B_{y}}$$
Where $a$ and $b$ are **oxidation numbers** that have opposite sings, $A$, $B$ chemical speci... |
##What is the logic behind this method, how to prove this method?
The logic of the method is in fact trivial. Suppose you have to write a compound knowing his oxidation numbers :
$$\ce{xA^{a} + yB^{b} -> A_{x}B_{y}}$$
Where $a$ and $b$ are **oxidation numbers** that have opposite sings, $A$, $B$ chemical speci... |
##What is the logic behind this method, how to prove this method?
The logic of the method is in fact trivial. Suppose you have to write a compound knowing his oxidation numbers :
$$\ce{xA^{a} + yB^{b} -> A_{x}B_{y}}$$
Where $a$ and $b$ are **oxidation numbers** that have opposite sings, $A$, $B$ chemical speci... |
Here's a challenge problem I created! None of my students could get it; can you?
$25$ grams of table salt (NaCl) is dissolved in $150$ grams of water. The temperature of the solution is raised to its boiling point until sodium chloride begins to precipitate.
How much water has boiled off when precipitation begins... |
How much water has boiled off when precipitation begins? |
For a lab assignment, I combined 10mL of 1M sodium sulfate solution with 10mL of 1M calcium chloride solution. The ionic equation I came up with is:
$$\ce{2Na^+ (aq) + SO4^2- (aq) + Ca^2+ (aq) + 2Cl^- (aq) -> CaSO4(s) + 2Na^+ (aq) + 2Cl^- (aq)}$$
I was then asked, in a lab question, the following:
>If the reac... |
For a lab assignment, I combined 10mL of 1M sodium sulfate solution with 10mL of 1M calcium chloride solution. The ionic equation I came up with is:
$$\ce{2Na^+ (aq) + SO4^2- (aq) + Ca^2+ (aq) + 2Cl^- (aq) -> CaSO4(s) + 2Na^+ (aq) + 2Cl^- (aq)}$$
I was then asked, in a lab question, the following:
>If the reac... |
As i understand, both Zn and Cu meet acid in the lemon, cause Zn and Cu release electron to form Zn2+ and Cu2+. So why the electron follow from Zn to Cu but not Cu to Zn ? It seem that one side have different charged but how while both side release electron ? Does one side release electron faster than one side ? |
In lemon battery experiment, as I understand, both Zn and Cu meet acid in the lemon, cause Zn and Cu release electron to form Zn2+ and Cu2+. So why the electron follow from Zn to Cu but not Cu to Zn ? It seem that one side have different charged but how while both side release electron in the same time ? Does Zn releas... |
In lemon battery experiment, as I understand, both Zn and Cu meet acid in the lemon, cause Zn and Cu release electron to form Zn2+ and Cu2+. So why the electron follow from Zn to Cu but not Cu to Zn ? |
I'm looking to purchase a UV lamp for initating some radical polymerizations. Is a hand lamp like the type for examining TLC plates (5-10W, like [this][1]) enough power to do this, or do I have to buy something a lot more expensive?
In my case, I'm looking to polymerize a fairly small sample (1mm thick, about 100 mm... |
How much UV lamp power is needed to initiate radical polymerization? |
Redox: Fe + 2HCl -> FeCl2 + H2
Oxidation: Fe -> Fe(2+) + 2e
Reduction: 2H(+1) + 2e -> H2
The HCl and H2 are formed by covalent bonds. The FeCl2 forms an ionic bond.
The iron actually loses 2 electrons to the two chlorines, so the oxidation equation makes sense to me. But the hydrogen is always in a **c... |
Redox: $\ce{Fe + 2HCl -> FeCl2 + H2}$
Oxidation: $\ce{Fe -> Fe^{2+} + 2e-}$
Reduction: $\ce{2H+ + 2e- -> H2}$
The $\ce{HCl}$ and $\ce{H2}$ are formed by covalent bonds. The $\ce{FeCl2}$ forms an ionic bond.
The iron actually loses 2 electrons to the two chlorines, so the oxidation equation makes sense to... |
Let's start straight away. In [this](http://books.google.co.in/books?id=32RJvfgkJgwC&q=GaAs#v=snippet&q=GaAs&f=false) book on page 4 Gallium arsenide's bond structure is shown like this:
$As$ is shown making $5$ covalent bonds.
Recently I came across [this](http://bo... |
In lemon battery experiment, as I understand, both $\ce{Zn}$ and $\ce{Cu}$ meet acid in the lemon, cause $\ce{Zn}$ and $\ce{Cu}$ release electron to form $\ce{Zn^{2+}}$ and $\ce{Cu^{2+}}$.
So why the electron follow from $\ce{Zn}$ to $\ce{Cu}$ but not from $\ce{Cu}$ to $\ce{Zn}$? |
For a lab assignment, I combined 10mL of 1M sodium sulfate solution with 10mL of 1M calcium chloride solution. The ionic equation I came up with is:
$$\ce{2Na^+ (aq) + SO4^2- (aq) + Ca^2+ (aq) + 2Cl^- (aq) -> CaSO4(s) + 2Na^+ (aq) + 2Cl^- (aq)}$$
I was then asked, in a lab question, the following:
>If the reac... |
What is the oxidizing agent for Fe in the following redox reaction? |
In the lemon battery experiment, as I understand, both $\ce{Zn}$ and $\ce{Cu}$ meet acid in the lemon, cause $\ce{Zn}$ and $\ce{Cu}$ release electrons to form $\ce{Zn^{2+}}$ and $\ce{Cu^{2+}}$.
So why do the electrons follow from $\ce{Zn}$ to $\ce{Cu}$ but not from $\ce{Cu}$ to $\ce{Zn}$? |
Why do electrons follow from Zn to Cu but not Cu to Zn in the lemon battery experiment? |
How do I perform a gravimetric analysis of Portland cement? |
For the usual explanation see [this wikipedia article](http://en.wikipedia.org/wiki/Galvanic_cell), I will try to explain it in other words and much easier.
One important thing that you should know is that energy comes from metal not from the acid.
Some species have the tendency to donate electrons other specie... |
For the usual explanation see [this wikipedia article](http://en.wikipedia.org/wiki/Galvanic_cell), I will try to explain it in other words and much easier.
One important thing that you should know is that energy comes from metal not from the acid.
Some species have the tendency to donate electrons other specie... |
In fact $Cu$ don't release electron, only $Zn$ does. For the usual explanation see [this wikipedia article](http://en.wikipedia.org/wiki/Lemon_battery), I will try to explain it in other words to make it much easier.
----------
One important thing that you should know is that energy comes from metal not from ... |
In fact $Cu$ don't release electron, only $Zn$ does. For the usual explanation see [this wikipedia article](http://en.wikipedia.org/wiki/Lemon_battery), I will try to explain it in other words to make it much easier.
----------
One important thing that you should know is that energy comes from metal not from ... |
> Also, why does it react with the OH− ion after being broken down?
Does it? Chlorine is not stable in water, it undergoes disproportionation :
$\ce{Cl2 + 3 H2O <=> OCl- + Cl- + 2 H3O+}$
Performing the reaction in alkaline media simply shifts the equilibrium to the right (Le Chatelier principle) and prevents ... |
I am reading this [wikipedia article](http://en.wikipedia.org/wiki/Crisscross_method) that I don't understand. What I don't understand is:
>suppose we have two elements $X$ and $Y$ having oxidation numbers $x$ and $y$ respectively. Can we prove that the compound formed will be $X_yY_x$.
I tried to understand th... |
I have just recently learnt the theory of fractional and normal distillations and the basics of maximum and minimum boiling azeotropes.
Most books say that the components of the mixture forming an azeotrope cannot be separated by distillation because on heating, the residue (in case of negative or maximum boiling a... |
Azeotropes and separation by distillation? |
I found [this reaction][1] of $\ce{NH4Cr2O7 + Hg(SCN)2 ->[\Delta]\ ?}$ on youtube, and I'm curious as to how it works. I tried searching online, but didn't find much on it.
Thanks.
[1]: http://www.youtube.com/watch?v=QzjPva_MUAg |
What happens in the reaction of ammonium dichromate and mercury(II) thiocyanate? |
To answer your initial question:
**The oxidizing agent is the reagent that gets reduced.** Conversely: **The reducing agent is the reagent that gets oxidized.**
Now, addressing your trouble with the concept:
You are right that hydrochloric acid is found in the ionic form when in aqueous solution, so:
$$\ce{HCl ... |
I am getting confused between the type of mesomeric effect (+M or -M) shown by compounds containing $\ce-COX$ where $\ce X$ is an electronegative element. Examples: $\ce -CONHCH_3$, $\ce -COOCH_3$, $\ce -COOH$. According to me, all these compounds must show both +M as well as -M effect. Since the group (eg $\ce -COOH$)... |
I think the contradiction you mention in your question is only apparent and is due to a misunderstanding around the word **valency**, which is by itself a rather ambiguous term ([valency vs oxidation state][1]).
According to [Wikipedia][2], valency yields the number of bonds an element tends to have. For instance, o... |
##What is the logic behind this method, how to prove this method?
The logic of the method is in fact trivial. Suppose you have to write a compound knowing his oxidation numbers :
$$\ce{xA^{a} + yB^{b} -> A_{x}B_{y}}$$
Where $a$ and $b$ are **oxidation numbers** that have opposite sings, $A$, $B$ chemical speci... |
##What is the logic behind this method, how to prove this method?
The logic of the method is in fact trivial. Suppose you have to write a compound knowing his oxidation numbers :
$$\ce{xA^{a} + yB^{b} -> A_{x}B_{y}}$$
Where $a$ and $b$ are **oxidation numbers** that have opposite sings, $A$, $B$ chemical speci... |
A photopolymerization requires a photoinitiator to capture the energy. Where does AIBN absorb versus your source?
![AIBN optical absorption][1]
OK, that looks good. AIBN has a strong cage effect. 2,2′-Azobis(2-methylpropionitrile) extrudes nitrogen and the radicals combine without initiating polymerization. T... |
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