# All Questions

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### Can a metal which contains impurity of another metal that is more reactive than itself be electrorefined?

So I know that cathode is made of pure metal and anode of impure. For example take Cu. Cu will be oxidised to Cu+2 at anode and will deposit at cathode. But now if it contains impurity of , let's say, ...
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### How to draw a reaction coordinate diagram for SN1 mechanism?

How would you draw a reaction coordinate diagram for an SN1 mechanism with the following conditions? each step in the mechanism (there are 2 steps) is favorable the second step of the mechanism is ...
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### Identifying sugars using Benedict's Solution [closed]

Would it be possible to figure out which sugars are being reduced when performing Benedict's test? For example, I want to test for the presence of glucose in a solution. Would this be possible?
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### Homework question: how are ceramic ionity crystals kept together? [closed]

The question is: How are ceramic ionity crystals kept together? The three different answers to choose from: Atom pairs of different substance share one electron pair. Ionity pairs of the same ...
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### Fe(II) NMR of deoxy-hemoglobin

As the article mentions, Fe-NMR is generally never carried out because of its low sensitivity. However, the article also says Fe(II)-NMR is possible because Fe(II) is sufficiently diamagnetic. Are ...
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### What do γ (gamma) and λ (lambda) mean in organic chemistry?

From the Wikipedia entry on Cyhalothrin: Pyrethroids such as cyhalothrin are often preferred as an active ingredient in agricultural insecticides because they are more cost-effective and longer acting ...
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### Why are square planar molecules drawn from the side plane as opposed to the top plane?

Simply put, why can't you draw square planar molecules top down (so you don't have to use depth bonds)?
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### Influence of Vinegar on Tap Water pH [closed]

Given tap water with a pH=7.6, I would like to know how much Wine Vinegar (6% acidity) I need to add in order to reach any target ph=X, e.g. ph=7. My purpose is to make Vegetable Milk (from Rice, etc.)...
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### How to calculate the enthalpy change for the oxidation of ethyne C2H2? [closed]

Given the following enthalpies of the reactions, calculate the enthalpy change for the oxidation of ethyne (C2H2). C2H2(g) + 5/2 O2(g) → 2CO2(g)+ H2O(l) C(s) + O2(g) → CO2(g) H = -394 kJ/mol 2C(s) + ...
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### change in enthalpy using enthalpy of formation data [closed]

I had this question in a formative test few months a go, I got it right but now I doubt my reasoning, the question asked for the change in enthalpy so I took the sum of the enthalpies of formation (...
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### Sodium Sulfate or Sodium Carbonate for electrolysis in water

I am not a chemist but I have a question regarding electrolytes in electrolysis. I have done a lot of reading but cannot find the answer I'm looking for regarding Sodium Sulfate (or Sulfide) I intend ...
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### Partial molar volume of binary mixture

A 2% (weight %) solution of a salt with Mr = 190.6 g mol-1 was prepared at 25 0C. The density of the prepared solution was 1.00926 g cm-3. The density of water at 25 0C is 0.99707 g cm-3, and the ...
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### Cp - Cv for a real gas

I am trying found a relation between cp - cv for a real gas. I know how to calculate for an ideal gas, but when I try to do the same for a real gas I stopped at some point and I don't know how to ...
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### Existence of gem-diols [duplicate]

In the mechanism for Reimer-Tiemann's reaction, I was told that two alcohol substituents on the same carbon atom are unstable, and this is why salicylaldehyde is formed. In fact, this is not the first ...
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### How to make zinc acetate solution [closed]

Please, I got 1 kilogram Zinc Acetate Dihydrate. I tried to make a solution with 1 liter boil water in 1 teaspoon (5-6 gram) of that zinc acetate powder. As this powder has about 30% elemental zinc so ...
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### Catalyze dehydration of formic acid [closed]

I know that formic acid will dehydrate upon heating to 100°C (under normal pressure) or adding sulfuric acid. What other catalysts can be used to induce this reaction?
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### Trying to find an experiment on the equilibrium of carbonated soda [closed]

I have to come up with an experiment which explores how the effects of one of the following: temperature, concentration or pressure, affect the equilibrium of the reaction of water and carbon dioxide(...
27 views

### Identifying electron donating or withdrawing groups

I am studying organic chemistry and have been confused on whether some groups are electron donating or withdrawing. Is there any particular rules that I can use to identify whether a group is electron ...
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### How to calculate the equilibrium constant from absorbance datas [closed]

Help me please for manual solution. The chelate CuQ22–(aq) formed by Cu2+(aq) and the complexing agent Q2–(aq) absorbs at 480 nm. When the concentration of chelating agent Q2–(aq) is five times in ...
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### Calculating change in state function following different paths

in thermodynamics, we learn that change in state function is independent of the path/process, and thus we can conveniently pick any arbitrary path that allows easier calculation. I'm TA'ing a class ...
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### Are aqueous solutions soluble in water?

Are already existing aqueous solutions (eg. NaCl in water) soluble in water? Since the solute is already broken up into ions, it shouldn't be, right?
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### Double Bond Geometry

The double bond at position '4' appears to be showing a 'E' geometry because the priority 1's are on opposite sides of the double bond ie top-left of bond4 is '1' (because Oxygen > Carbon)); bottom-...
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### Stereochemistry Absolute Configuration direction confirmation question

I need confirmation whether the absolute configuration for Chiral Centre "3" is a 'R' or 'S'. I think that it's a 'S' because NH2 is priority1, The OH side priority2 and the CHCH3CH3 side is ...
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### Are there any combustible chemicals that will create a whole through a plastic tub, carpet, plywood, and a ceiling tile overnight [closed]

Found a metal safe with combustible liquid inside. Would not eat through linoleum so thought it would not effect plastic. The next morning I found out that it made a hole through to the floor below(...
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### Application of enthalpy of hydration [closed]

I'm doing an experiment about how a variable affects the enthalpy of hydration of compounds, but don't know the significance of this. Would there be a reason for wanting to achieve higher or lower ...
19 views

### Solubility of d -block metal salts

Which d-block salts are usually insoluble in water at room temperature? I know that generlly sulphides , hydroxides and oxides of d -block metals are insoluble but I want to know more acidic radicals ...
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### Molar volume of salt [closed]

A 4% (weight percent) solution of a salt with Mr = 189.6 g mol-1 was prepared at 25 0C. The density of the prepared solution was 1.00926 g cm-3. The density of water at 25 0C is 0.99707 g cm-3, and ...
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### Mixing Isopropyl rubbing alcohol & Hydrogen Peroxide together to disinfect [closed]

I just had Covid and want to disinfect my house without using the harsh toxic chemical disinfecting cleaners. I know rubbing alcohol as well as hydrogen peroxide have both been recommended but I want ...
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### Why do certain compounds dissolve in oil? Why do some types of compounds dissolve in oil, yet not water? [duplicate]

Sorry if this is an obvious answer. I tried rewording this question every way I could, but search engines came up with nothing- they all skirted around this exact question. Why do certain compounds, ...
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### How is temperature constant in enthalpy change formula?

I have learnt that temperature sort of indicates the internal energy of a system, or at least this is my intuition. So if temperature is constant, then internal energy is constant as well. But in the ...