# All Questions

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### Why chlorine ion is more stable than chlorine atom?

In heterolytic cleavage , For instance,NaCl breaks in two fragments Na+ and Cl-. If Chlorine is full filled because it takes one electron from sodium ,now chlorine is full filled then why further ...
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### If you placed silver metal into silver nitrate, would a reaction occur?

thinking about oxidation and reduction, what happens to the silver metal and the silver ions?
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### Organic Chemistry, carbonyls

https://imgur.com/a/WmTInTa I'm a bit lost on how to do this, for Product C I can see two things happening: 1) The -OCH3 attacks the alpha hydrogen, but that doesn't really make sense as then you ...
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### Check My Beginner's Guide to Shells, Energy Levels, Subshells, and Orbitals

I am a beginner trying to summarize what I've learned about: Shells Energy Levels Subshells and Orbitals all at the high school level. Unlike related threads, I'm going to try to: Define each word ...
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### All-Gauche Alkane: Is It Possible?

I've learned about anti and gauche conformations throughout my scholastic journey, and I have heard often that straight-chain alkanes always adopt an all-anti conformation in their lowest energy state....
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### Why is 4-t-butyl aci-nitro cyclohexane stable whereas aci-nitro cyclohexane is not?

During my PhD, about fifty years ago, I had reason to use 4-t-butyl aci-nitro cyclohexane and found it to be remarkably stable. Usually aci- nitro compounds revert to nitro compounds very quickly ...
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### what is the mechanism of hydrolysis of alkyl cyanides

I am very much confused about the mechanism of hydrolysis of cyanides, in my book it is given that hydrolysis of cyanides in presence dil HCl or alkalies gives carboxylic acid whereas on hydrolysis ...
13 views

### Half life problems with regards to carbon 14 and carbon 12 isotopes

If the ratio of carbon 14 to carbon 12 was only 0.326 of that in the atmosphere today. What is the age of the substance if the half life of carbon 14 is 5700 years.
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### How does one dilute sulphuric acid (1.28sg@25ºc 460g/L) to 3 M Sulphuric Acid?

Thanks for looking. The extent of my research around the issue so far. SA sg table but wrong temp 60f not 77f/25c http://www.sschemical.com/wp-content/uploads/2013/05/Conversion_Table.pdf From ...
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### Does orientation matters to this extent in reactions?

In the above question I know that the three reactions involved are $\mathrm{S_N2}$ reactions and therefore there shall thrice inversion of the substitute. So, I got the solution for the MCQ as: ...
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### Why do transition metals have multiple oxidation states? [closed]

I know it is to do with the subshell configuration of the electrons, but what is the actual answer? Thank you :)
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### For an electron arrangement diagram, is it necessary to show the inner electron shells or is it customary to only show the valency electrons?

Which electron arrangement diagram is correct? The one that shows all electron shells or the one that only shown the valence electron shell?
36 views

### Are aqueous (aq) elements involved in equilibrium?

The reaction was something like this: A (s) + B (l) yields to C (aq) + D (aq) The question asked: If you added another D, which way would the equilibrium shift to? I answered that it would have no ...
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### Molecular similarity using Tanimoto coefficient

I'm trying to use a method for evaluating similarity of molecules. I have seen many publications in the machine learning community have used Tanimoto coefficient. However, when I read about it, it ...
2k views

### Why Isn't the American Nickel magnetic?

I never thought that modern American nickels actually contained nickel anymore. However, according to this site, the coins actually do contain 25% Nickel, the rest being copper. And yet, No US coin ...
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### If all the points on my graph fit on a logarithmic and polynomial trend line, how do i justify which trend line i should use? [closed]

My graph is mass of deposit vs concentration. The mass of deposit increases with concentration.
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### Can Potassium Carbonate be used to reduce Calcium hardness in water

I have a solution of KCl 20g/l (2%) and 500mg/l Ca, To reduce the hardness, Na2CO3 is normally used, but can I use K2CO3 instead?
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### How many g of Al(NO3)3 would be in 0.089 L of a 0.63 M solution of Al(NO3)3? [closed]

I'm stuck on this question. How many g of Al(NO3)3 would be in 0.089 L of a 0.63 M solution of Al(NO3)3?
22 views

### What is the best method to seperate phenol and benzoic acid?

Question: What is the best method to separate phenol and benzoic acid? I know that The phenol and Benzoic acid can be separated via their varying solubility, by heating the mixture in H2O to dissolve ...
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### Methods to quantify lead(II) concentration in water on the ppm/ppb level

While there are several ways to quantify metal concentrations in water, a lot of them are only specific to select metals. For example, there is the orthophenanthroline method for quantification of Fe(...
68 views

### What is really the number in the periodic table?

I learning basic chemistry and i have a doubt. I have this definitions Molar mass: Is the mass of $6.022\times10^{23}$ atoms of a chemical element and its unit of measurement is $\mathrm{g/mol}$. ...
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### Acids and Bases (Buffers) [closed]

In order to create a buffer, you need to add conjugate acid to the base solution you created. How much methylammonium chloride would you have to add so that the concentration of the conjugate acid is ...
11 views

### Chemical equilibrum [closed]

An equimolecular mixture of NH3 and O2 is contained in a container. After the oxidation reaction took place to obtain NO, the equilibrium is established: 4NH3 + 5O2 ⇌ 4NO + 6H2O + Q It is found that ...
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### Can o-phenanthroline be used as a complexing agent for lead(II)?

I’ve been trying to find a method to perform a spectrophotometric analysis to determine lead concentration (on the ppm level). This would require some chelator capable of forming a coloured complex ...
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### How does the nucleophilicity of a leaving group affect SN1/SN2 reactions?

I was reading about SN1 and SN2 reactions and I was wondering how nucleophilicity of the leaving group contributed to the reaction? For example, if I react iodoalkane with a strong nucleophile (but ...
17 views

### What is the pressure of the dry gas alone? [closed]

A 550.mL sample of oxygen is collected over water at 25ºC and 560.0 torr pressure. Vapor pressure of water at 25 ºC = 23.8 torr)
The boiling point of a substance $X$ at 1 atm pressure is $500 k$ . The enthalpy of vapourisation at the boiling point of $X$ (l) is 80 kj/mol .The molar specific heat of $X(l)$ = $5 × 10^{-3}$ kj/mol ...