All Questions

0
votes
0answers
25 views

Point group from mono to bulk MoS2

Many articles say even numbers of layers or bulk crystal MoS2 have D6h point group and odd numbers of layers (including monolayer) MoS2 have D3h point group But whenever looking at the figure of ...
-2
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0answers
18 views

Convergence failure

I trying to run a DFT calculation with the following job input: ...
0
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0answers
25 views

Finding the n-factor of C₂O₄²⁻

In the reaction $\ce{C2O4^2- → CO2}$ the $n$-factor of $\ce{C2O4^2-}$ is: So I think the answer to this question is $2$ because in $\ce{C2O4^2-}$ the oxidation number of carbon is $+3$ and in $\ce{...
-1
votes
1answer
32 views

Do all reactants have appear in the first mechanism of the rate law?

I have the following reaction, $$\ce{CO + NO2 -> CO2 +NO}$$ The "second" mechanism is given: $$\ce{NO3 + CO -> NO2 + CO2}$$ So when searching for the first mechanism, I found this one to work: ...
0
votes
1answer
26 views

Why is the major product of the reaction of 1-naphtol with benzene diazonium chloride not the ortho product?

If 1-napthol reacts with benzene diazonium chloride, it gives the para product with respect to the hydroxyl group. However, shouldn't the major product be the ortho one, because there will be ...
-1
votes
1answer
87 views

Mechanism of ring formation of an epoxide under acidic aqueous conditions [on hold]

I am trying to figure out the mechanism of this reaction: $\huge{\ce {\ \ \ \ \ \ ->[H3O+] \ \ \ \ \ \ }}$ I think the $\ce{H+}$ will first attack the oxygen of the epoxide and another $\ce{OH-}...
-1
votes
1answer
25 views

Carbonic acid, bicarbonate in water [on hold]

When you add CO2 into water, carbonic acid is created. From carbonic acid (H2CO3), HCO3 + H is formed. When CO2, and H2CO3 leave the water, does HCO3 leave as well, often measure as kH, carbonate ...
0
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0answers
24 views

Adding apple cider vinegar to a solid DIY deodorant

If I wanted to add a bit of apple cider vinegar to my oil based deodorant, to increase antimicrobial properties, would this cause me to need a preservative? My deodorant is not water based, so I don't ...
0
votes
1answer
31 views

How can one distinguish an IR spectroscopy alcohol band on an organic molecule versus the alcohol bands from water in the sample?

I'm reading this IR spectra and trying to determine if the large broad band at 3388 is alcohol from an intermediate or from water in the sample. The details of the reaction, conditions, and mechanism ...
2
votes
1answer
41 views

Can you lower the alcohol concentration of a drink using vegetable oils?

The log POW of ethanol is −0.18 according to Wikipedia, i.e. in a two-phase system ethanol would preferrably accumulate in the aqueous phase, but not by much. Suppose I wanted to lower the alcohol ...
-3
votes
0answers
20 views

How can I make 2M of sodium hydroxide solution from 25g of sodium hydroxide pellet? [on hold]

I have 25 grams of sodium hydroxide pellet. I want to prepare 2M of sodium hydroxide solution. How do I go about it, please?
0
votes
1answer
42 views

Maximum number of atoms in the ground state

I was given the following question. A sample contains $100$ identical and hypothetical $H$-like atoms ( $Z$ may be fractional). Out of the given atoms, some are in the ground state, while others ...
-3
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0answers
14 views

Coordination compounds ean rule [on hold]

Which complex follow the sidgwick rule Ean rule where M =24?
-3
votes
0answers
39 views

when water and alcohol are mixed, why don't the boiling points change? [on hold]

when water and alcohol are mixed, why doesn't the boiling points change? The vapor pressure should increase so the atmospheric pressure will equal to the vapor pressure faster, how do alcohol and ...
-2
votes
0answers
19 views

Thermal conductivity of materials [on hold]

Why does having delocalised electrons increase a materials thermal conductivity?
-2
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0answers
18 views

Reaction of metals during electrolysis? [on hold]

I am currently looking into what metals can be used for electrolysis....more specifically to split hydrogen from oxygen ....im curious as to what I may use metal wise that won't leave contaminants in ...
-3
votes
0answers
25 views

Will a nail in a bottle rust without water being in the bottle? [on hold]

Will a nail rust if it is in a bottle without water? Any help is appreciated as this is for a school project.
-8
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0answers
35 views

Is Organic Chemistry Neccessary in the Med field [on hold]

Is it necessary that one who wishes to go into the Medical field must study Organic Chemistry.
2
votes
2answers
47 views

MO diagram of BeH₂

I was learning about the MO diagrams of triatomic molecules and was left slightly confused about $\ce{BeH2}$. A picture of the MO is shown below: When looking at the $\mathrm{1s}$ combinations, I ...
1
vote
0answers
27 views

Derivation of mass flow rate and mean velocity [on hold]

How do you derive the expressions for the mass flow rate, $\ce{w = 2bWρ<u>}$, and the mean velocity for the schematic below? How do you get the momentum balance: $\ce{WΔx(ρu^2(x) + p_1) + LW\...
3
votes
2answers
64 views

Scientific Reason for Salt Solution Gaining Volume

A little background to this question: my mom placed a glass with salt and enough water to just cover the salt in a room to "absorb negative energy" out of the room at her office. It obviously "worked"....
0
votes
0answers
45 views

Why charged canonical structures of phenanthracene are not taken into account? [on hold]

In the process of delocalization of pi electrons they do not directly jump between atoms instead it first finds place on a carbon or something else but why it is not in phenanthracene or any other ...
1
vote
0answers
16 views

Using Wilkinson's Catalyst to reduce esters?

I was solving some questions on alcohols when I came upon a question in which it was asked that whether esters can be reduced using hydrogen in the prescence of wilkinson's catalyst. Now I know that ...
3
votes
1answer
132 views

LDA and an aldehyde

Compounds A and B both react with LDA (lithium diisopropylamide, a strong base) to form the same anion C with the formula $\ce{C4H5O^-Li^+}$. I am unfamiliar with LDA. My first thought was that ...
-3
votes
0answers
11 views

Using Hess's Law [on hold]

Calculate ΔH for the reaction 2 Al (s) + 3 Cl2 (g) → 2 AlCl3 (s), given: a. 2 Al (s) + 6 HCl (aq) → 2 AlCl3 (aq) + 3 H2 (g) ΔH = -100.8. kJ b. HCl (g) → HCl (aq) ΔH = -69.7 kJ c. H2 (g) + Cl2 (g) → ...
-1
votes
0answers
18 views

Theoretical Resistance Relationship of Electrolytes [on hold]

I'm a senior physics/chemistry student working on a practical assignment where I am trying to identify the resistance of CuSO4 in solution (distilled water). I have recorded my data and determined it ...
-1
votes
0answers
23 views

Which of the following are correct about cycloalkane stability? [on hold]

Which of the following are correct about cycloalkane stability? A) Stability ∝1 anglestrain B) Stability ∝1d where d is distortion or deviation from 109°5' for 1 bond C) Stability ∝1 ...
-1
votes
0answers
14 views

Does electron affinity affect bonding

I know the Enthalpy for the first electron affinity will be negative, but what happens when an atom bonds with two other atoms and gains two or more electrons? What happens then?
1
vote
1answer
36 views

Lewis structure of benzenediazonium [on hold]

In the benzenediazonium $\ce{C6H5N2+}$ the nitrogen contributes its lone pair to the carbon in benzene. So where is one electron of that carbon, since it is not used for bonding with nitrogen where ...
2
votes
1answer
56 views

Gibbs Free Energy and Maximum Work

I am a high school student and my professor mentioned that the Gibbs free energy is the maximum amount of work (or useful work) that a system can do, whereas entropy is a measure of the non-available ...
0
votes
0answers
12 views

Reliable reaction predictor software [duplicate]

I am currently working on some novel techniques for synthesis,could anyone suggest a good reaction predictor software ,that may be reliable to a large extent ,so that I could anticipate my products to ...
-1
votes
0answers
22 views

Product of 2,4-Pentanedione and PFBHA Reaction [on hold]

I have made a solution derivatizing 2,3-Pentanedione with PFBHA. I am trying to figure out the product I have made. I know the chemical formula is C5H8O2 for 2,3-pentanedione and C8H4F5NO for the ...
26
votes
2answers
5k views

When a candle burns, why does the top of wick glow if bottom of flame is hottest?

Totally an elementary question. Staring at a candle, it appears that the bottom of the wick is dark whereas the top glows. However the bottom of the flame (the blue) is the hottest. Is the reason ...
0
votes
0answers
16 views

Effect of Concentration on Reaction Rate - Calculating Final Concentrations in Solution [on hold]

Question asks: Determine the final concentration of IO₃⁻ used in the reaction. Show a complete sample calculation for the (8.0 mL Solution A + 2.0 mL H2O Equation: IO3− + 3HSO3− → I− + 3 HSO4− ...
-2
votes
0answers
9 views

Ingredient mixing [on hold]

what ingredient (when mixed with liquid i.e juice etc...) will help to preserve candy (gummy and hard)? It also has to be non toxic because it is being ingested. It also has to go along with syrups.
0
votes
1answer
44 views

Why do metals form cations?

metals that have a low number of occupied shells such as lithium and potassium should have a stronger electrostatic attraction to their nuclei, so what causes them to always lose their electrons ...
-4
votes
0answers
26 views

Reactions to Caffeine [on hold]

I am looking to see what reacts with caffeine for a school project. I wish to not go too far into detail, seeing that I am trying to invent something to better medicine with, but any information would ...
-3
votes
0answers
22 views

Calculating Volume of CO2 produced [on hold]

The question states "What volume of CO2 will be produced if you react 1.5 g of Li2CO3 with an excess of 6.0 M HCl at room temperature?" Which fundamental equations could be used to solve such a ...
1
vote
1answer
36 views

CIP Rules - How to deal with a double bonded nitrogen?

If a substituent were to exist, how will one deal with the doubly bonded nitrogen? In the tree will the nitrogen with the double bond have (C,C) or (C,C,C) or (C,C,lone pair)? I could not find this ...
0
votes
2answers
41 views

Size of hydrocarbons and boiling point

Increasing the contract surface area between hydrocarbons raises boiling point, so hexane should have a higher boiling point than propane. This doesn't really make sense to me. What is the difference ...
-2
votes
0answers
25 views

What effect do Bond angles have on molecules? [on hold]

What are examples of the effect of different types of bond angles between different molecules and between same molecules with different Bond angles?
2
votes
0answers
44 views

Importance of substrate stereo chemistry in semi pinacol rearrangement [on hold]

In my book (Organic Chemistry by Solomons, adapted by MS Chouhan), the following reactions are given... I don't quite get this as another conformer (rotation by 120 degrees of the first carbon) of ...
1
vote
0answers
17 views

Final product when sp2 oxygen of acid is O18 in fischer esterification

In the question above, i was curious about option 3. If the carbonyl oxygen is O18, shouldn't half of the product we obtain contain O18 on the carbonyl since we have two possible leaving groups with ...
3
votes
2answers
256 views

Why is my conclusion inconsistent with the van't Hoff equation?

Let's say I hypothesize that a graph of $\ln K$ vs. $1/T$ has a slope of $-∆G^\circ/R$ and a $y$-intercept of $0$. I prove it simply: $$∆G^\circ = -RT\ln K \quad\to\quad \ln K = -\frac{∆G^\circ}{RT}$$...
0
votes
0answers
18 views

Hydrogen peroxide and carbon as hybrid rocket propellant?

I was thinking that a hybrid rocket could be made using hydrogen peroxide and activated charcoal or some other carbon source. Step 1: Decompose hydrogen peroxide to steam and oxygen, as in a ...
-1
votes
1answer
24 views

Could there be a class of drugs beyond, similar to barbiturates and benzodiazepines? [on hold]

I'm talking about group of drugs similar to them but different though.Is there anything beyond benzodiazepines?
0
votes
0answers
14 views

Basicity of subsituted amines

In comparing hydroxylamine, hydrazine, and methylamine for basicity, the order of increasing basicity is hydroxylamine < hydrazine < methylamine. I tried to reason this trend based on electron ...
-1
votes
1answer
52 views

What happens in this reaction! Some hints needed

I understand step A involves reductive ozonolysis. and that step B is addition involves addition of ammonia to the carbonyl site to form imines. But what does the sodium salt of trichloroacetic acid ...
0
votes
0answers
13 views

Is the exchange interaction always less in value than coulomb interaction? (Absolute values of both.)

I wonder for 2 electron interactions whether exchange interaction (K) is always less than the coulomb interaction(J) value in all cases (HF or DFT) or there is no such necessity? Does it depend on the ...

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