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4 views

Polar protic solvents with melting point between between 0 and 25C?

Need a solvent for a freezing point depression experiment. Acetic acid is the only one i know of, but it is not ideal due to the low freezing point depression constant. Any suggestions?
-1
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0answers
7 views

Is Diamond a chemically stable replacement for glass?

Assuming diamond was as cheap to manufacture as glass, and we had an efficient process for shaping (growing?) it, and we could therefore fashion beakers or graduated cylinders out of it, would diamond ...
1
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0answers
17 views

Safe sprayable fast-drying liquid for mould release agent

I am looking for a safe sprayable (will be sprayed as a fine mist) liquid that I can use as a base for a mould release. The mould release is simply melted paraffin wax suspended in the liquid which is ...
0
votes
1answer
16 views

When is Raoult's Law valid for solid-liquid solution?

Raoult's Law for solid-liquid solution is stated as such in my books that it is applicable for all non-volatile solutes. However different solutes must have different attractive or repulsive forces ...
2
votes
2answers
31 views

Dipole moment of (1s,2s,3s)-1,2,3-trichlorocyclopropane

Which of the following compounds has a zero dipole moment? Only one of the options is correct According to me, it looks like both options (c) and (d) are right. Since the dipole moments of option (c) ...
0
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1answer
31 views

Organic chem mechanism

I don’t understand how the reaction produces this product. In the starting material, there is an $\ce{-OH}$ group attached to carbon 5 but where did the $\ce{-OH}$ group go in the product?
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0answers
23 views

Confusion in determining enantiomerism from R,S naming

I was interested in determining whether the two compounds below were each other's enantiomers or not- Rotating (A) by 180 degrees in the plane of the screen we can clearly see the two are each other'...
-2
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0answers
21 views

why do phenols react differently from alcohols? [duplicate]

I'm wondering why do phenols sometimes react differently from alcohols despite the presence of the same functional group?
0
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0answers
21 views

Comparing stability of CF3+ and CD3+ [duplicate]

This is a question from my text book. Compare the stability of carbocation between $\ce{CF3^+}$ and $\ce{CD3+}$. The answer is given $\ce{CF3+}$ due to backbonding. But I see backbonding as a sort ...
-1
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1answer
36 views

The dominant product of given acid base reaction

What is the dominant product of this acid base reaction? I think that the ether oxygen would be the more reactive site, since this is not an ester. Where it is my understanding that an ether ...
3
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0answers
32 views

The Misconception of Entropy

It was recently brought to my attention that my understanding of entropy is wonky at best. In my experience, entropy was introduced (superficially at best) during general chemistry/foundations of ...
2
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0answers
18 views

Artificial Muscle | HASEL's Reaction

I was watching a TED-talk on artificial muscle, HASEL, where the inventor demos that an insulated oil in the presence of electric potential field gets displaced due to Maxwell stress inside oil. ...
0
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1answer
63 views

Finding reactants in a azo-coupling reaction whose product is given

Find the reactants of the following azo-coupling reaction: My solution would look like this: My reason for the above answer The amino Group is more activating than the nitro group and therefore the ...
1
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2answers
40 views

Calculating the cell potential of a half cell from two half cell equations

I understand the premise of the question and how to solve it but I don't quite understand why I'm a factor of 2 out: Construct a potential diagram (at $\mathrm{pH} = 0$) for the reduction of aqueous $...
0
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0answers
35 views

Mechanism of reaction of 1-chloro-2,3-epoxypropane with sodium ethoxide and ethanol [closed]

What will be product of reaction of 1-chloro-2,3-epoxypropane with sodium ethoxide in the presence of ethanol? I think that the reaction proceeds via SN2. However, I am not sure whether $\ce{C2H5O^-...
-1
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1answer
40 views

Is there more efficient reaction for generating hydrogen rather than HCl+Al [closed]

I want to generate hydrogen to acquire known pressure inside of an object. I have calculated required mole number for hydrogen using the ideal gas equation by giving wanted pressure, volume and ...
4
votes
1answer
46 views

IUPAC Nomenclature of a dioic acid

I have to name the following organic cpd according to IUPAC. My attempt: I am unable to select a parent carbon chain as there are 2 carbon chains possible and I don’t know how do we proceed in such a ...
0
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0answers
36 views

Issues regarding toxicity and feasibility of improving on home-made deodorant using aluminium salts [closed]

I was able to find several sources (An example article from Healthline) on the Internet that told me how to do Deodorant without aluminium by myself. A list of ingredients used in the above linked ...
2
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0answers
37 views

Removing Iron Oxide from a Floppy Disk?

Don't ask me why, but I did an experiment where I tried to remove the magnetic iron oxide layer from a floppy disk by soaking it in HCl for a week. I put pieces of floppy disk in 0 - 1 M HCl, then ...
0
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0answers
31 views

Synthesis of carboxylic acids from alkanes

My teacher told that straight-chained alkanes are oxidized to carboxylic acids when reacted with $\ce{O2}$ at high temperature in presence of $\ce{(CH3COO)2Mn}$, but didn't tell any mechanism for the ...
0
votes
1answer
29 views

Monosodium Diphosphate (NaH3P2O7) Preparation

I looked on wikipedia for an answer but I couldn't even find a page for this salt, a subsequent google search didn't further enlighten me. Does any one know how monosodium diphosphate can be prepared?
-1
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0answers
26 views

How much energy in joules is required to heat 44.72 g of H2O from 10.00 °C to 37.50 °C? [closed]

How much energy in joules is required to heat $44.72\ \mathrm g$ of $\ce{H2O}$ from $10.00\ \mathrm{^\circ C}$ to $37.50\ \mathrm{^\circ C}$? (Heat capacity of liquid $\ce{H2O}$ = $75.37\ \mathrm{J\ ...
6
votes
3answers
980 views

At what pressure will hydrogen start to liquefy at room temperature?

I want to increase a fixed-size object's internal gas pressure by generating hydrogen in it, but I could not find the proper phase diagram for it. So I am wondering how high pressures I can get.
2
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0answers
29 views

Purification of Red Phosphorus

The Boring Stuff I'm well acquainted with various fields of science & engineering, but my foray into the world of chemistry is relatively recent. I'm in a location (probably most of us are to some ...
3
votes
1answer
61 views

Wittig reaction in presence of carboxylic acids

The following reaction came in a recent test: According to this reaction, the acidic hydrogen would protonate the ylide, and the standard wittig reaction would not take place. This source agrees with ...
-2
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0answers
23 views

Research questions for high school students [closed]

I'm enrolled in IB DP and I've chosen Chemistry HL. It's required that I write a research paper and I've no idea what topic should I choose. Do you guys have any suggestions/ideas? I was thinking of ...
1
vote
1answer
30 views

Why do PES graphs list 4s after 3d? [duplicate]

Coming straight off of some electron configuration worksheets, our teacher started to teach us how to read photoelectron spectroscopy (PES) graphs and I'm having a bit of trouble with the two. During ...
-2
votes
1answer
35 views

How do i experimentally determine the vapour pressure of a solution?

So i wanna dissolve different salts in water and measure the vapour pressure of the resulting solution. I am doing this to compare the freezing point depression of different cations, used with the ...
-1
votes
1answer
31 views

Why is change in internal energy not equal to zero during a phase transition?

Many books state that when there is no change in temperature $\Delta U$ is equal to zero. Why is this not applicable for phase transitions? I have had this question for a while now and have been ...
-2
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0answers
21 views

Prevention and Testing methods before consuming possible Adulterated food [closed]

https://en.wikipedia.org/wiki/Adulterated_food https://www.google.com/search?client=ms-android-lava&sxsrf=ALeKk03ZJD6WkFNVzgFNUeU41Yb_qDv51w%3A1600661762803&ei=AiloX_fUMISchwP2t7ngBw&q=...
-2
votes
0answers
18 views

Ratio of Resonance Hybrid? [closed]

In 1932 A.A Levine and A.G Cole studied the ozonolysis of o-xylene and isolated three products : glyoxal, 2,3-butanedione, and pyruvaldehyde. In what ratio glyoxal : 2,3-butanedione : pyruvaldehyde ...
0
votes
1answer
28 views

Why is there carbon lining on the steel vessel in Hall Heroults process?

I read This answer, and completely understand that why graphite anode is used , but I have read that the vessel acts as the steel cathode but with lining of carbon. What is the need of this carbon ...
1
vote
2answers
50 views

Easiest/Fastest way to obtain a good quantity of fine Iron powder? [closed]

I am wanting to make a reasonable quantity (10-100g) of iron powder that I can use to visualise magnetic fields (by putting the powder in a thin layer between two transparent materials). The finer the ...
-3
votes
0answers
13 views

Find change in pressure for a van der waal gas [closed]

You are given $\pu{1 mol}$ of a Van der Waal gas and you have the volume change from $\pu{10 l}$ to $\pu{9 l}$ and the temperature changed from $\pu{273.15K}$ to $\pu{274K}$. Find $\Delta P$.
0
votes
1answer
37 views

Why is the temperature graph sigmoidal in simple distillation of components with very different bps?

I'm writing an organic chemistry lab report on distillation and I thought I understood this, but the more I look at my lab textbook, I realize I don't. My textbook 1 explains that the temperature of ...
-3
votes
1answer
42 views

Oxidation of alcohols by Ceric Ammonium Nitrate

I have realized that reaction with ceric ammonium nitrate essentially results in coordination of alcohol with $\ce{Ce(IV)}$ and my teacher referred that we should be able to proceed it to form ketone ...
0
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0answers
38 views

Mechanism of reaction of alcohol with NaBr + H2SO4

My teacher told that the mechanism for reaction of alcohol with $\ce{NaBr + H2SO4}$ follows SN1 when alcohol is 2°/3° and SN2 when it is primary or methanol. He told that the reactivity of alcohol ...
1
vote
1answer
117 views

Plotting the data using Beer-Lambert law [closed]

For the spectroscopy lab we had a stock dye ($\pu{1.00E-4 M}$ Erioglaucine Blue) that we had to dilute. We had to dilute $\pu{1 mL},$ $\pu{3 mL},$ $\pu{5 mL},$ $\pu{8 mL},$ and $\pu{10 mL}$ in $\pu{...
-3
votes
0answers
33 views

Which resonance hybrid structure of NO2- is correct? [closed]

I saw on youtube that you could write the Lewis structure of $\ce{NO2-}$ as given in the second image where we can add the red dots on either side since both of them have an equal formal charge $(-1/2)...
0
votes
2answers
70 views

Balancing a reaction where dichromate ion reacts with ethanol to give Cr(III) and carbon dioxide

I have only started to learn balancing redox reactions, and a recent question has me confused. The question is : Balance in both acidic medium and basic medium: $$\ce{Cr2O7^2- + C2H5OH -> Cr^3+ + ...
0
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0answers
17 views

Is it Possible To Mix Oobleck in a Paint Shaker? [closed]

Is it Possible To Mix Oobleck in a Paint Shaker? Based on the action lab experiment, not only that it's possible but it's also very efficient! The guy shows how difficult it is to mix the paint in the ...
10
votes
2answers
1k views

How to differentiate between iron and sodium flames?

According to my textbook, when a flame test of an iron salt is performed, it produces an orange, mostly yellow flame. Sodium salts also produce a yellow flame. As the colours of these two flames are ...
0
votes
0answers
43 views

Why is vapor pressure constant at boiling point?

At non-boiling point, I understand that when you add heat, temperature increases and also the amount of gas increases, so by using $PV=nRT$ at constant volume, the increase in $n$ and $T$ would ...
0
votes
1answer
32 views

Why do you count both bonding electrons towards an atom's octet, but you only count one of them towards the atom's charge? [duplicate]

For example, oxygen is neutral when it has just 6 electrons. But the pink O in the molecule pictured has 3 bonds giving it 8 electrons, a full-octet. It's more electronegative than all the atoms it's ...
10
votes
2answers
859 views

What is the name origin of ester?

Ester is quite a random nomenclature for a compound derived from a parent acid and parent alcohol. Is there any reasoning behind using the word 'ester' to name such compound (for memorising purpose)? ...
0
votes
0answers
25 views

Why do the lanthanides and actinides have a 5d and 6d orbital, respectively? [duplicate]

I was taught in school that the rare earth metals were the $\mathrm{f}$-orbital group. Additionally, the Aufbau principle states that the order of orbitals based on energy levels is $\mathrm{6s4f5d}$ ...
1
vote
1answer
36 views

Why does there need to be a planar intermediate in 2,2'-dibromobiphenyl when one of the phenyl groups rotates?

I was in class and my professor brought up the example of 2,2'-dibromobiphenyl: In her example, one of the bromines was actually pointing into the page and the two phenyl groups were not actually on ...
-3
votes
0answers
25 views

Pharmacology question regarding allopurinol shelf life [closed]

Assuming that the proper storage conditions are met, what is the theoretical shelf life and half life of zyloprim (allopurinol)? The debate this is referencing is about non-life saving drugs that are ...
2
votes
0answers
27 views

How to use Clausius-Mossotti equation to determine the molecular structure of a compound? [closed]

A question in my exam came as follows: Explain the Clausius-Mossotti equation. How is it used in establishing the molecular structure of a compound? I have studied the Clausius-Mossotti equation and ...
-2
votes
0answers
22 views

Free energy calculation [closed]

Calculate the reaction free energy of H2(g) + I2(g) 2HI(g) when the concentrations are 0.006 mol L-1 (H2), 0.03 mol L-1 (I2), and 1.27 mol L-1 (HI), and the temperature is 700K. For this reaction Kc ...

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