# All Questions

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### For sequential extraction is the reagent pH adjusted or is it the sample with the reagent that's pH adjusted?

I'll be doing sequential extraction on ash samples, and I'm not sure whether the procedure indicates to adjust the pH of the reagent or the pH of the mixture (reagent with sample)? I copied and pasted ...
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### Friedel-Crafts acylation with withdrawing group?

Will a Friedel- Crafts acylation take place on ortho-bromotoluene? I do understand that Friedel Crafts reaction does not occur when there is an electron withdrawing group on the ring but is there any ...
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### Acid catalyzed bromine substitution in an alcoholic ester. What is the major product and why?

This was in a paper I gave. I want to know the mechanism by which both of these products will be formed and why is the 1st one the major product. My thinking is that the -OH group will be converted ...
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### Why does pure alpha glucose powder clump when attempting to dissolve in water and become very hard?

I noticed that when I attempted to dissolve some pure alpha glucose powder in water, it would become hard and clump at the bottom of the beaker if I dumped it into the beaker all at once. It was ...
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### Krazy glue (cyanoacrylate) and methyl acetate, gas produced?

I added a nail polish remover substitute (main ingredients: methyl acetate, isopropyl myristate) to krazy glue (cyanoacrylate) that was stuck on a surface of painted metal (and some plastic parts). It ...
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### Energy required to break apart water molecules in dissociation?

I'm learning about the process of dissociation. I'm aware in dissolution that essentially three processes occur (I know I may be simplifying it, but I am in Year 11): Solute particles break apart (...
30 views

### Does Phenol + FeBr3 +Br2 forms para bromo phenol or not Please Help as it's gonna decide my future [closed]

According To me it wouldn't form para bromo benzene as FeBr3 is a lewis acid and form dative bond with oxygen atom and it will form -HO-Fe(Br)3+ and its meta director as well as deactivating group so ...
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### How easily can bisphenol A used in polycarbonate plastic containers “leak” into the water that they hold? [closed]

Considering circumstances where the water bottle is indoors at room temperature and not exposed to any extreme heat or forms of impact. How would the BPA separate from the plastic into the water?
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### Internal Energy of a System [closed]

Can the Internal Energy of a system change without changing it's temperature? And why in isothermal expansion of a gas the change in internal energy is zero?
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### Does anyone know how to precipitate silver from Silver sulfadiazine? [closed]

I have a quantity of Silvadene or Silver sulfadiazine. I’m wondering if anyone knows how to extract pure silver from it. Thanks in advance.
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### Does pairing of electrons release or consume energy?

While studying Crystal Field Theory, it was said that low-spin complexes only form when the Crystal Field Splitting energy exceeds the pairing energy of electrons. What I infer from this is that it ...
35 views

### Questions about molar ratio

I am new to chemistry so this might be about a very easy concept that I might be misunderstanding but I would appreciate your help! I watched a video of combining hydrogen and oxygen and forming water....
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### How do I get calcium citrate to precipitate in experiment on extraction of citric acid from juice?

I was planning to extract citric acid from mango juice by first using Aspergillus niger fungus by fermentation to convert the mango juice to citric acid, then extracting by first adding sodium ...
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### Is Long Term Preservation of Acrylic Possible? [closed]

Is there anything that could be done to preserve/stabilize acrylic objects on long-term timescales or is decomposition inevitable?
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### What is the suitable amount of in the given reaction EDC [closed]

chitosan (200 mg) was dissolved in 20 mL of 1.25% acetic acid solution, and VES (600 mg) was dissolved in 25 mL absolute ethyl alcohol followed by the addition of a suitable amount of EDC, what is the ...
49 views

### A liquid which climbs out of its pot [closed]

My Russian born wife recently asked me to buy her a skin remedy widely used in Russia. In English this is the oil of a plant called Sea Buckthorn. It is a thin yellow liquid. My wife put some of this ...
80 views

### Why is hydrogen peroxide acidic in aqueous solution?

This seemed like a trivial question to me... until I began to think about it. The "usual" criteria for greater acidity are larger sizes of the atom attached to the acidic proton within the ...
13 views

### Specific heat capacity of alcohol [closed]

A piece of iron of mass 0.27kg is immersed in a boiling water and and dropped into 0.10kg alcohol at 27°C. If the final mixture is 50°C, what is the specific heat capacity of the alcohol? (Specific ...
23 views

### uv-vis same spectra [closed]

Hi there I am doing an experiment of uv assay of Dextromethorphan hydrobromide where its run under uv in two solutions an acitic acid and sodium hydroxide the uv results showed that both solutions had ...