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The equation for the reaction between permanganate and iron(II) ions in **acidic** solution:
$MnO_4^- + Fe^{2+} + ==> Fe^{3+} + Mn^{2+}$
My book, as well as a certain [equation balancer][1] show that the answer is:
$5Fe^{2+} + MnO_4^- + 8H^+ ==> 5Fe^{3+} + Mn^{2+} + 4H_2O$
They check the charges to ensure t... |
There is one other way that I have used, using a **linear system** to solve this reaction.
As you can see, in this special case (because the reaction is relatively easy to solve already) we see that there must be $H_2O$ molecules on the product side of the equation, because there is no oxygen on the products already... |
There is one other way that I have used, using a **linear system** to solve this reaction. Although it can be used for other more casual reactions too, such as the combustion of ethanol for example.
As you can see, in this special case (because the reaction is relatively easy to solve already) we see that there must... |
On the physics.nist.gov site: http://physics.nist.gov/Pubs/AtSpec/node06.html
The table titled "Atomic structural hierarchy in LS coupling and names for the groups of all transitions between structural entities" contains the hierarchy of atomic LS coupling. But there is a rather interesting footnote in the table: *... |
What is the 'ancestral term' in the LS coupling scheme? |
I was drinking some tea, and I randomly decided to pour some into the toilet in an unbroken stream; can particles travel "upstream" quickly enough to reach the mug of tea? How fast can diffusion occur in this system?
What if I pour it into highly concentrated toxic waste? Given that even trace amounts could make i... |
Will alcohol or soap damage plastic or rubber? |
Although your question seems, to me, a bit broad, this is the best I can do for you at the moment. Polyethylene (or poly-methylene) is, according to wikipedia, "the most common plastic." Wikipedia also claims that this material is resistant to solvents. However, I have the impression that there may not be a precise ans... |
Although your question seems, to me, a bit broad, this is the best I can do for you at the moment. Polyethylene (or poly-methylene) is, according to wikipedia, "the most common plastic." Wikipedia also claims that this material is resistant to solvents. However, I have the impression that there may not be a precise ans... |
I was looking at the [chemical structure of H<sub>2</sub>SO<sub>4</sub>](http://www.webanswers.com/education/high-school/what-is-the-chemical-symbol-of-sulfuric-acid-23fae0).
![enter image description here][1]
![enter image description here][2]
Intuitively, I would have expected this molecule to be square planar... |
Permeakra's explanation is spot on but I didn't really get a good understanding of the result until I visited the wikipedia page on [Sulfate][1].
The central hallmark of the question and the confusion was why a ten electron configuration would adopt a sp3 configuration more reflective of an octet. This was a source ... |
>Will soap damage plastic or rubber?
**Probably not.** Most plastics and rubbers are resistant to aqueous solutions and ionic compounds (including most surfactants and soaps).
>Will alcohol damage plastic or rubber?
**Maybe.** There are two problems, in that neither *alcohol* nor *plastic* refer to specific co... |
[was it those crazy tea fanatic Cuban scientists again?][1]
The particles can ***supposedly*** travel "upstream" if you were to say, pour it into your toilet as closely as your hand can get without a hazmat team busting down your door. But I would be more concerned about the sneaky particles that instead diffuse thr... |
Inherent error in mass and volume? |
Is it possible to work out without post-Bohrian mathematics? |
What determines the electronegativity of an element? |
[was it those crazy tea fanatic Cuban scientists again?][1]
The particles can ***supposedly*** travel "upstream" if you were to say, pour it into your toilet as closely as your hand can get without a hazmat team busting down your door. But I would be more concerned about the sneaky particles that instead diffuse thr... |
I've been struggling with this problem that I can't seem to figure out. I kind of know how to solve it but I think there's missing information.
Without any further ado, here's the problem.
"The combustion of 1 mole of glucose C6H12O6 releases 2.82*10^3 Kj of heat. If 1.25 g of glucose are burnt in a calorimeter c... |
Calculate the heat capacity of the calorimeter? |
Why is it that oxidizers (specifically KClO3) are at risk of causing a fire when coming into contact with the rubber stopper used to contain them in their container, but can be slowly heated if they do not contact the rubber stopper?
Update: I found a way to better ask this question. Why is it that oxidizers are inc... |
Why must an oxidizer not touch rubber? |
STOP! You are thinking about the ***entire*** process far too early. Whenever you have information that you don't know why it is given, STOP! Break the problem into smaller problems!
You ***think*** you need the specific heat capacity of glucose? Why not try to calculate it then?
Here is a technique you should ad... |
STOP! You are thinking about the ***entire*** process far too early. Whenever you have information that you don't know why it is given, STOP! Break the problem into smaller problems!
You ***think*** you need the specific heat capacity of glucose? Why not try to calculate it then?
Here is a technique you should ad... |
Water ($H_{2}O$) is dipole. The reason why is simply because it is not symmertrical, and there are more electrons on the oxygen side than on the hydrogen side.. (Also because of the electronegativity.)
But why isn't $H_{2}O$ symmetrical like $CO_{2}$ is? Why isn't $H_{2}O$ non polar like $CO_{2}$ is? Does it have an... |
Why is $H_{2}O$ dipole? |
Is the **percent** error formula you are looking for something like the formula [this][1] website service offers? Your lab instructor should have given you the formula, perhaps you missed that. Do you have a reliable lab partner you can ask? The error in mass would probably be something to do with how far each measurem... |
Is the **percent** error formula you are looking for something like the formula [this][1] website service offers? Your lab instructor should have given you the formula, perhaps you missed that. Do you have a reliable lab partner you can ask? The error in mass would probably be something to do with how far each measurem... |
Water ($H_{2}O$) is a dipole. The reason why is simply because it is not symmetrical, and there are more electrons on the oxygen side than on the hydrogen side.. (Also because of the electronegativity.)
But why isn't $H_{2}O$ symmetrical like $CO_{2}$? Why isn't $H_{2}O$ non polar like $CO_{2}$? Does it have anythin... |
Why is $H_{2}O$ a dipole? |
Yep, it has to do with the orbitals.
$\ce{CO2}$ is linear, so even though the $\ce{C-O}$ bonds have individual dipole moments, the overall dipole moment is zero as these cancel out (they point in opposite directions, as shown in the diagram below).
On the other hand, $\ce{H2O}$ is "bent", which means that the ind... |
I am reading *Ionic Equilibrium* by James N. Butler. Using silver(I) chloride in excess aqueous chloride as an example it speaks of several forms: AgCl (s) i.e. the ionic crystalline salt, Ag+ (aq) and Cl-(aq) the aqueous ions from dissociation, and finally AgCl(aq), which Butler purports to be "dissolved covalent si... |
Does "covalent" AgCl (aq) exist and if so, how to quantify its concentration? |
I am currently studying basics of simulation and want to try out some experiments. It is a known fact that gold nanoparticles can bind to chemical groups which contains thiol(RSH).I want to simulate the binding of thiol group to gold nanoparticle. How can i do this? where i have to start? which software can be used fo... |
http://www.watertechonline.com/drinking-water/article/the-fine-points-of-methane-removal
>When you are diluting air in the system and/or properly evacuating it, you must consider water temperature. Methane is completely dissolved in water at 42 degrees Fahrenheit (5.5 C) but can be completely released (as a gas) at ... |
Methane seems to dissolve more readily in cold water. Why? |
Q: Fertilizers supply the essential elements, nitrogen, phosphorus and potassium for plant growth. A bag of fertilizer contains 500f of ammonium sulfate, (NH4)2 SO4, and 500g of potassium nitrate, KNO3. Calculate the percentage by mass of nitrogen in the bag of fertilizer.
This came in a test of mine and I got the a... |
No, at least my answer is different anyway. I got 17.542% mass nitrogen. I do not understand what your calculation is.
Here is what you should find out first. What is the molar mass of these two substances?
There is 1000g of material total. There are two moles nitrogen per mole ammonium sulfate. There is one mole... |
How to extract pure caffeine from tablets? |
No, at least my answer is different anyway. I got 17.542% mass nitrogen. I do not understand what your calculation is.
Here is what you should find out first. What is the molar mass of these two substances?
There is 1000g of material total. There are two moles nitrogen per mole ammonium sulfate. There is one mole... |
I got 17.542% by mass nitrogen.
---
**An explanation for beginners, a refresher for the rest of us:**
To make sure anyone reading knows what molar mass means. It is the mass that one **molecule** weighs when you collect a mole of them together. A **mole** is just a way of saying a really big number which is actu... |
I got 17.542% by mass nitrogen.
---
**An explanation for beginners, a refresher for the rest of us:**
To make sure anyone reading knows what molar mass means: It is the mass that one **molecule** weighs when you collect a mole of them together. A **mole** is just a way of saying a really big number which is actu... |
I got 17.542% by mass nitrogen.
---
**An explanation for beginners, a refresher for the rest of us:**
To make sure anyone reading knows what molar mass means: The mass of one **mole** of something, in our case the mass of a mole of nitrogen, or the mass of a mole of ammonium sulfate, etc. A **mole** is just a wa... |
Basically, does this also occur with the 4d, 6d groups as well? I am at a lack of understanding in this topic, I am just wondering what specific elements does this jump in a lower atomic radii occur. It seems to happen due to the $d$ orbital being occupied? Making that judgement based on this graph. Hoping someone can ... |
Is there a similar characteristic of the Lanthanide Contraction in the other transition metal groups? |
http://www.watertechonline.com/drinking-water/article/the-fine-points-of-methane-removal
>When you are diluting air in the system and/or properly evacuating it, you must consider water temperature. Methane is completely dissolved in water at 42 degrees Fahrenheit (5.5 C) but can be completely released (as a gas) at ... |
Just wondering, why is it called "carbonation" and we drink "carbonated" beverages when carbonate is CO3 while CO2 (carbonite) is present in carbonation? |
Why is it called "carbonation"? |
I am using an old book and they almost use both terms interchangeably sometimes. Do they mean the same thing? Similiarly for "steam point" and "boiling point" |
Is "ice point" the same as "freezing point"? |
$$Ba(NO_3)_2(aq) + Na_2CO_3(aq)$$
In the above reaction both the substances are in water, however water plays no role in the reaction. Why is it that although water is present in the reaction, it does not play a reactant role? To clarify, why isn't the above written as:
$$Ba(NO_3)_2(aq) + Na_2CO_3(aq) + H_2O$$
... |
Why doesn't water play a role in reactions in aqueous reactions? |
I checked the Wikipedia page, but it did not seem to provide a very intuitive explanation.
What distinguishes a molecule such that it behaves like a polyatomic ion? I understand that it is a covalent bond, but what distinguishes it from other covalent bonds that allow it to act like one element. Why does it have a ... |
What makes a molecule a polyatomic ion? |
We were taught that there are primarily 4 find of reactions - synthesis, combustion, single displacement, double displacement. When the reactants are given to you, the reaction can be predicted.
For example:
If the reactants are AB + CD, it will be a double displacement (2 pairs of compounds)
If the reactants ... |
What causes reactions to react the way they do? |
This is a less than obvious and bigger topic than you probably realise. A general chemistry textbook might have a chapter called **kinetics** or **reaction mechanisms** which describe this better than I can. Some things that will help you in understanding some models of reactions and their mechanisms are things like **... |
I haven't quite reached the point where I can read a full-fledged text on chemical kinetics and thermodynamics yet but bear with me, please. I'm sort of wondering why a value like $K_{eq} = \frac{[\ce{NO}^2][\ce{O_2}]}{[\ce{NO2}]^2}$ wouldn't have units of M.
Any pointers? |
Why are equilibrium constants unitless? |
This is a less than obvious and bigger topic than you probably realise. A general chemistry textbook might have a chapter called **kinetics** or **reaction mechanisms** which describe this better than I can. Some things that will help you in understanding some models of reactions and their mechanisms are things like **... |
I haven't quite reached the point where I can read a full-fledged text on chemical kinetics and thermodynamics yet, so bear with me, please.
I'm wondering why a value like $K_{eq} = \frac{[\ce{NO}^2][\ce{O_2}]}{[\ce{NO2}]^2}$ wouldn't have units of M?
|
The concise answer: Because the units cancel. Here I'll use $\lvert \rvert$ = concentration = moles/liter = m/L
$K_{eq} = \frac{\lvert NO_2 \rvert \lvert O_2 \rvert}{\lvert {NO}_2 \rvert^2} (?) units$
$K_{eq} = \frac{\lvert NO_2 \rvert \lvert O_2 \rvert}{\lvert {NO}_2 \rvert \lvert {NO}_2 \rvert} (?) units$
$K... |
The concise answer: Because the units cancel. Here I'll use $\lvert \rvert$ = concentration = moles/liter = m/L
$K_{eq} = \frac{\lvert NO_2 \rvert \lvert O_2 \rvert}{\lvert {NO}_2 \rvert^2} (?) units$
$K_{eq} = \frac{\lvert NO_2 \rvert \lvert O_2 \rvert}{\lvert {NO}_2 \rvert \lvert {NO}_2 \rvert} (?) units$
$K... |
I haven't quite reached the point where I can read a full-fledged text on chemical kinetics and thermodynamics yet, so bear with me, please.
I'm wondering why a value like $K_{eq} = \frac{[\ce{NO}]^2[\ce{O_2}]}{[\ce{NO2}]^2}$ wouldn't have units of M?
|
#Note#
**This answer is incorrect, but because it is a common pitfall I'll leave it to show. It is wrong 1) because the OP meant $\lvert \ce{NO} \rvert ^2$ in the numerator not $\lvert \ce{NO2} \rvert$ as I took it (edited) and 2) because the $K_{eq}$ formula is incorrect. I will post a better answer.**
The conci... |
This is a less than obvious and bigger topic than you probably realise. A general chemistry textbook might have a chapter called **kinetics** or **reaction mechanisms** which describe this better than I can. Some things that will help you in understanding some models of reactions and their mechanisms are things like **... |
> If the reactants are AB + CD, it will be a double displacement (2 pairs of compounds)
An example of this might be two salts that dissociate into their respective ions in a solvent, and then the cation and anions that were not previously paired find their way to each other, if they form a salt that is not easily di... |
Hand sanitizer is gel in its bottle. But when I pour it on my palm, it turns into a free flowing liquid. Why does that happen? It does not turn to a liquid when I pour it on my floor or my table. It does not seem to be related to heat, as I tried with a hot surface. |
Why does hand sanitizer turn to a liquid after coming out of the bottle? |
A little research and perhaps a small experiment might help you figure something like this out on your own. First, have you tried [wikipedia][1]? A small mention of research can go a long way. Describing what product you are interested in never hurts either. Is the [polyacrylic acid][2], a [dispersant][3] in this subst... |
How do I find the change in Gibbs free energy of the reaction H2 + .5O2 -> H2O when it is at 75C and standard pressure. Do I calculate the Gibbs free energy of each species and then do Gprod - Greactants? |
How do I find change in Gibbs free energy of this reaction? |
Hand sanitizer is gel in its bottle, but when I pour it on my palm, it turns into a free flowing liquid. Why does that happen?
It does not turn to a liquid when I pour it on my floor or my table. It does not seem to be related to heat, as I tried it with a hot surface. |
Why does hand sanitizer turn into a liquid after coming out of the bottle? |
> The focus of my question here is this: In a laboratory there is a Bunsen burner, a hot plate, hydrochloric acid, and concentrated ammonia. What would you mention about safety precautions?
As students of chemistry and science, we often need to write detailed conclusions about our laboratory experiments. This eventu... |
What components are important in any laboratory experiment conclusion write-up? |
I'm reviewing some chemistry work and seem to have forgotten a lot.
I don't know how to obtain the "exact charge of the ions" that will be formed by each atom mentioned. I also have to figure out whether they are positive/negative
Two examples are,
H (Hydrogen) - 1 valence electron - +1 charge - H+1
Now if ... |
I'm reviewing some chemistry work and seem to have forgotten a lot.
I don't know how to obtain the "exact charge of the ions" that will be formed by each atom mentioned. I also have to figure out whether they are positive/negative
Hydrogen, for example, can form the ion:
$\ce{H -> H^+ + 1e^-}$
Now if I were... |
I've been looking on the net for some reference showing a phase diagram for elements at least from H up to Ne, specifically; i'm looking which of these elements can be solid or liquid in vacuum. But i haven't really found anything, except some anecdotical comments here and there that hydrogen and helium evaporate in va... |
Let's say I truncate the virial equation after the third term for use as my equation of state:
$${P\over\rho RT}=1+B\rho+C\rho^2$$
I have tabulated values for $B(T)$ and $C(T)$. I know $P$ and $T$ and want to solve for $\rho$. The equation is cubic in $\rho$ meaning I could potentially have three real solutions... |
What meaning do multiple real solutions of a truncated virial equation have, if any? |
Let's say I truncate the virial equation after the third term for use as my equation of state:
$${P\over\rho RT}=1+B\rho+C\rho^2$$
I have tabulated values for $B(T)$ and $C(T)$. I know $P$ and $T$ and want to solve for $\rho$. The equation is cubic in $\rho$ meaning I could potentially have three real solutions... |
How much of the anion species is left over after the first precipitation? |
> The focus of my question here is this: In a laboratory there is a Bunsen burner, a hot plate, hydrochloric acid, and concentrated ammonia. What would you mention about safety precautions?
As students of chemistry and science, we often need to write detailed conclusions about our laboratory experiments. This eventu... |
What components of safety should be included in a chemistry laboratory experiment conclusion? |
I've been looking on the net for a reference which shows a phase diagram for elements at least from $\ce{H}$ up to $\ce{Ne}$. Specifically, I'm looking which of these elements can be solid or liquid in a vacuum.
I haven't really found anything, except some anecdotical comments here and there that hydrogen and heliu... |
I wish to grow algae in a 40% CO2 aqueous environment. What devices are traditionally used for such a purpose?
|
how To Maintain A 40% CO2 Aqueous Environment? |
I wish to grow algae in a 40% $ \small \ce{CO2}$ aqueous environment.
What devices are traditionally used for such a purpose?
|
Maintaining a 40% CO2 aqueous environment? |
If you want to know the temperature at atmospheric pressure below which an element is a solid, just look up the melting point of that element. Google will be your friend.
As for evaporation of solids, ALL materials evaporate. That is, all materials exhibit a positive non-zero vapor pressure. That vapor pressure w... |
The equation for the reaction between a [permanganate][1] and iron(II) ions in **acidic** solution is:
$MnO_4^- + Fe^{2+} + ==> Fe^{3+} + Mn^{2+}$
My book, as well as a certain [equation balancer][2], shows that the answer is:
$5Fe^{2+} + MnO_4^- + 8H^+ ==> 5Fe^{3+} + Mn^{2+} + 4H_2O$
They check the charges... |
Is there an alternative to the half-reaction method to solving red-ox reactions? |
We were taught that there are primarily four kind of reactions, synthesis, combustion, single displacement, and double displacement. When the reactants are given to you, the reaction can be predicted.
For example:
If the reactants are AB + CD, it will be a double displacement (two pairs of compounds)
If the re... |
What does the moment of inertia for a molecule mean? How is it useful? Most importantly, how would I go about solving it for a triatomic molecule?
|
I am currently studying the basics of simulation and want to try out some experiments. It is a known fact that gold nanoparticles can bind to chemical groups which contains [thiol][1] (R–SH group). I want to simulate the binding of a thiol group to a gold nanoparticle. How can I do this? Where do I have to start? Which... |
Both $H_2$ or $O_2$ are stable molecules. However when given energy they heat up and form $H_2O$. My teacher explained that the increased energy breaks the bonds, allowing new ones to form. However, why don't the old forms reform instead? Why are new bonds created?
|
Why do $H_2$ and $O_2$ create $H_2O$? |
Why do H2 and O2 create H2O? |
I wish to grow algae in a 40% $ \small \ce{CO2}$ aqueous environment.
What devices are traditionally used for such a purpose?
[edit] By 40% $\small\ce{CO2}$ I mean 40% of the partial pressure of the dissolved gases.
|
I wish to grow algae in a 40% $ \small \ce{CO2}$ aqueous environment.
What devices are traditionally used for such a purpose?
[edit] By 40% $\small\ce{CO2}$ I mean water under air with 40% $\small\ce{CO2}$. |
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