All Questions
41,639
questions
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3
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Can you put an equation in your aim?
I am writing my report, and I am not sure what to do for my aim.
I have 2 options;
To determine if increasing the concentration of HCl accelerates the rate at which CO2 is released in the reaction;
...
- 1
0
votes
0
answers
8
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Do disulfide bonds determine the 3-dimensional structure of a protein? or do they just stabilise the 3D structure?
I was wondering if disulfide bonds actually determine the 3D shape of a protein, as I noticed that most disulfide bonds occur when two cysteine side chains exist in close proximity to each other. So ...
- 65
-1
votes
0
answers
9
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O2(aqueous) + H+ =?
So just like the title. I've got dissolved oxygen O2, and I've got a free hydrogen H+ after cracking H2O into hydrogen and a hydroxyl radical. While O2 has its bond energy, after meeting H+ we get?
1
vote
0
answers
11
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Does the Darzens reaction work with an alpha-chlorocarboxylic acid and an aldehyde?
Is it possible that a reaction of an alpha-chlorocarboxylic acid with an aldehyde work for the Darzens reaction to produce an epoxide (with NaOH as the base, and H3O+ workup)?
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-1
votes
0
answers
15
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Quantum mechanical model
How do we know that in the same shell which subshell (s,p,d,f) is near to nucleus?
Actually, my question was that an electron in an orbital of higher angular momentum stays away from the nucleus than ...
- 1
5
votes
2
answers
43
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Do chemical bonds impact half-life of elements?
Let’s say we have element X with half life of 100 years. Can chemical bonds like X−X or X−Cl increase/decrease half-life of X?
As a follow up question, can it increase/decrease radioactivity of X?
1
vote
1
answer
75
views
Can the relative velocity of two colliding molecules be too large to allow reaction to occur?
In a collision between two molecules, can the relative velocity of one with respect to the other be too large for a reaction to occur? For example, suppose that two molecules collide with (a) a ...
- 115
-3
votes
1
answer
25
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Is sucrose soluble in water? [closed]
Is sucrose soluble in water?
If not, then why not? If yes ,than why it's yes?
Please explain it to me.
Thanks in advance.
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-4
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0
answers
14
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Which acid will titrate first in a mixture of acids [closed]
In a mixture of acids containing a weak acid and strong acid which will react first with a strong base?
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0
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0
answers
36
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Why is AgOH brown when silver(I) ions are colorless?
As Wikipedia states, $\ce{Ag+}$ ions are colorless in solution: https://en.wikipedia.org/wiki/Color_of_chemicals
Compounds that I know of containing $\ce{OH-}$ are also colorless or white (such as $\...
- 27
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0
answers
16
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Making up a TE solution [closed]
You are required to make up the following TE solution: 10mM Tris, 2mM EDTA.
Calculate the quantity of TRIS and EDTA that will be required to make up a 1 litre volume
of this TE solution.
Mole weights ...
0
votes
1
answer
39
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Why is diamond not the most dense substance?
Diamond is the hardest substance on earth which can be attributed to it's tightly-bonded crystal lattice. Hence, assuming there were a substance more dense than diamond, mustn't it be harder than ...
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-2
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0
answers
18
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CAThode and ANode [closed]
Why did scientist use a perforated cathode when they discovered anode rays?
And was there a hole in anode when scientists discovered cathode rays I mean when cathode rays were attracted towards anode, ...
- 9
-1
votes
0
answers
45
views
Can you make alcohol from oxalic acid? [closed]
Can you make alcohol from oxalic acid?
Since you can get aldehyde by reduction of carboxilic acid and can also get alcohol by reduction of aldehyde, I was wondering what's it like reducing oxalic acid ...
0
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0
answers
11
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how to dissolve sodium silicate with acetone [duplicate]
I'm doing an experiment to dissolve sodium silicate with acetone to form liquid glass coating for ceramic tiles, first question is is it possible?, second question is if its possible what's the ...
1
vote
1
answer
26
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Why the electronic configuration of samarium is ending with 4f⁶6s²
What is coming in my mind is that 4f^7 6s^1 should be more stable as it allows two orbitals to be half filled rather than 4f^6 6s^2 in which only one orbital is completely filled....can someone please ...
- 73
0
votes
1
answer
39
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Differential equation in consecutive reactions
I'm blocked in a step of getting to the equation $(7)$, more precisely in the step between $(5)$ and $(6)$. I show my way to solve it down, but I don't get the same as $(6)$, so I wanted to know if I ...
- 188
0
votes
1
answer
19
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Gibbs Free Energy of Ideal Gas in Carnot Cycle
Let's just say we have 2 moles of monoatomic (maybe helium) ideal gas that is doing a Carnot Cycle with reservoir temperature of 300 and 750 K.
Now, here's a simple question, what is the Gibb Free ...
1
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0
answers
22
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Dissolving Pyrite with HCl: Will dissolving KNO3 in HCl give it a similar oxidizing effect to HNO3?
I'm trying to dissolve small pyrite (FeS2) grains. It's supposed to be done in nitric acid, but my lab doesn't have any. It does have a lot of 37% HCl and various salt oxidizers, such as KNO3, KMnO4, ...
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-2
votes
0
answers
42
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Hybridization of [CoF3(H2O)3]?
I encountered a question which asked how many electrons in t2g of [CoF3(H2O)3] . Now with ligands like H2O Complex of Co are low spin complexes or d2sp3 . So according to that t2g6 eg0 will be the ...
- 115
1
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0
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4
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How to restart an interrupted TS optimization job in Gaussian16 without the CalcFC option from the chk file? [migrated]
I have to do the TS optimization of a very large structure.
Initially, I used the typical opt(ts,calcfc,noeigentest) at the route section, but during the ...
- 11
0
votes
0
answers
13
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Surface-Plasma Interaction Education Guidance
I work in a field where understanding interactions between plasmas and metals for the purpose of generating a particular reaction is important. However, I know very little about plasma assisted ...
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0
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0
answers
36
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Why is the pH of this ammonia solution more acidic than another ammonia solution?
I made two similar ammonia solutions in different ways, and they resulted in different pH, but i'm not sure why.
Solution 1
Added 5.84 g NaCl to a 500 mL flask. Then added 10 mL 25% ammonia solution. ...
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0
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0
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50
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Which is more basic: (3Z)-penta-1,3-dien-3-amine or (2E)-penta-2,4-dien-1-amine?
Alright, I've been drawing resonance structures and comparing conjugate acids/bases for this one for like half an hour and I've gotten nowhere. Can anyone please explain which of these is more basic, ...
0
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0
answers
33
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Mechanism for reaction of beta-ketoacid with AcONa, AcOH with heat
I am unsure of how to go about designing a mechanism for the following molecule's reaction with AcONa and AcOH with heat.
I thought perhaps it may work as a cyclisation reaction, forming an ether; or ...
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2
votes
1
answer
82
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Photoelectric effect: What happens when you irradiate the metal strip with a wave of frequency exactly equal to threshold frequency of the metal?
My teacher said that if we irradiate the metal strip (used in generating the photoelectric effect) with light having frequency equal to the metal's threshold frequency, then the electrons will have ...
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3
votes
1
answer
333
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Is it possible to store a Tween 80 stock solution?
I am making a stock solution of Tween 80 (0.05 % w/v) and each experiment requires just 15 ml of the stock solution. Is it possible to make a large batch (about 100 ml) and store it somewhere? If so, ...
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0
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0
answers
39
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Determining the order of reaction of HCl in the reaction between KMnO4 and HCl
I obtained the following rate-concentration graph for the reaction between hydrochloric acid and potassium permanganate. The x-axis is the concentration of hydrochloric acid (varying), while the y-...
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0
answers
37
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Is the chemistry behind the "Anoxic Filter" actually real? [Pond/Aquarium Denitrification]
In the Aquarium hobby, there are two methods to remove NO3 from your water:
Plants
Water changes
There are a handful of people and companies that sell porous biological media that claims to create ...
- 63
0
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0
answers
28
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Enthalpy of thermal decomposition of copper(II) carbonate and manganese(II) carbonate
I was wondering if anyone knows the theoretical or estimated value of the enthalpy of thermal decomposition of Copper(II) carbonate and Manganese(II) carbonate. Or if you know any methods to calculate ...
6
votes
1
answer
61
views
Iodine clock reaction: lower temperature but faster result?
I was told by several high school students that they experienced odd results in their iodine clock reaction lab. They did several different trials, and the lower the temperature, the faster the blue ...
- 611
1
vote
1
answer
49
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On the definition of Molar conductivity
The textbook I follow defines the conductivity, $\kappa$, as
$$\text{Conductance} \ G=\frac{1}{R}=\kappa \frac Al$$
The inverse of resistivity, called conductivity, is represented by the symbol $\...
0
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0
answers
31
views
Conceptual doubt regarding electrolytic cells involving acids
Consider the following cell
Ag(s) | AgIO3(s) | Ag+
(x M), HIO3 (1 M) || $Zn^{2+}$
(1 M) | Zn(s)
My doubt is not regarding the full calculation of the EMF , but the meaning of ' 1 M HIO3 '.
What I mean ...
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5
votes
1
answer
365
views
Is the 'i' prefix for "iso-" italicised?
I want to abbreviate pseudoisocytosine. Should it be "ΨiC" or "ΨiC"?
I would usually write "sec-butyl", "tert-butyl", etc, and using "t-BuOH" for &...
5
votes
2
answers
573
views
Mechanism of the blue bottle experiment
I have researched multiple mechanisms for this experiment yet all of them suggest different versions or are too vague. None of them are consistent since the final overall equation seems to be missing ...
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1
vote
0
answers
80
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How would you remove sulfur hexafluoride from a gas sample?
What procedures would be available to remove SF6 from a sample (or stream) of gas?
The ideal answer would be a list of options. If it helps, please assume the rest of the sample consists of noble ...
- 147
4
votes
2
answers
80
views
Why do we call salts such as AgCl sparingly soluble?
Though we use the term practically insoluble for salts like $\ce{AgCl}$ in inorganic chemistry, we preferably call them "sparingly" soluble salts in physical chemistry seeing their tiny ...
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1
vote
2
answers
34
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How to remember what measure of concentration to use for colligative properties
Like the title says, how do I remember what measure of concentration(molality, molarity, mole fraction) to use for various colligative properties such as increase in boiling point when a non-volatile ...
- 61
6
votes
1
answer
141
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Lithium hydride from lithium fluoride
There is a method of preparation of LiH by reacting a lithium halide (chloride, bromide, or iodide) with sodium hydride in an inert organic diluent such as tetrahydrofuran. Is it possible to replace a ...
- 61
0
votes
0
answers
30
views
How is it possible that some celestial bodies have icy surfaces when water boils off at any temperature in absolute vacuum?
Why doesn't the ice on comets or on the moon Enceladus sublime? Enceladus doesn't have an atmosphere, so what is it that prevents Enceladus' water ice surface from becoming a gas? Did I miss something?...
-2
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0
answers
54
views
Could reaction-diffusion processes on the subquantum level lead to an accurate description of the phenomena that quantum mechanics deals with?
Could reaction-diffusion processes taking place at the subquantum level lead to an accurate description of the phenomena that quantum mechanics deals with?
I.e. Can physical fields be explained by ...
- 105
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1
answer
47
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Where does the exchange energy released in an exchange interaction come from?
Two electrons in different orbitals can exchange with each other and if this happens they release a certain amount of exchange energy. But where does this energy come from? And wouldn't the atom ...
- 305
0
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0
answers
20
views
Literature values for the molar absorptivity of Methylene Blue
I am having trouble finding literature values for the molar absorptivity of MB dye from a scientific journal, preferably one that is recent.
I am also having trouble finding an explanation for why MB ...
-1
votes
0
answers
27
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Objective for producing ethanol from brown algae "Chaetoceros calcitrans" using acid hydrolysis [closed]
Can you please help me think about a good objective on our research with regards to producing ethanol from brown algae "Chaetoceros calcitrans" using acid hydrolysis.
The measurement of ...
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0
answers
30
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How much "free ammonium" would be present in a solution of ammonium and citric acid?
I am making a mixture. I start with aqueous ammonia (aka ammonium hydroxide) that is 10% NH3 by weight (roughly 8.2% N by weight). I add 50 grams of citric acid (dry powder, 100% purity) to 1 L of the ...
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-5
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0
answers
21
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Are there things with different physical attributes that serve exact same purpose in a system? [closed]
I’ve been puzzling about this cross-disciplinary concept for the last week.
Can you think of any two things that have different physical make up that serve the exact same purpose?
For instance, ...
-1
votes
0
answers
56
views
How to degrease a bird? [closed]
I found a pigeon which is a victim of some automotive grease. The legs and wings were quite covered with it.
I used paper towels to remove as much as possible (gently) however, there is a limit to the ...
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-3
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0
answers
79
views
How can I find out the name of the chemical compound for these potentials? [closed]
These potentials are for chemical molecules, how do I know the chemical compound of these potentials? - I am a physicist -
$$V(r,\theta)=-\frac\alpha r+\frac{\beta\cos^2(\theta)}{r^2\sin^2(\theta)}$$
...
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2
votes
1
answer
90
views
Could fluorinated gases be removed from the atmosphere? [closed]
Background
Among all the discussion of 'greenhouse gas removal' (GGR) to aid climate change mitigation, almost all is concerned with removal of carbon dioxide. There are one or two mentions of ...
- 147
0
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0
answers
36
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Why do alkali metals form coordination compounds like transition metals? [duplicate]
I've recently read that there are a type of cyclic ethers called "crown ethers" than can coordiate certain cations like potassium and sodium. How is this possible if they have no d-orbitals (...
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