# All Questions

31,052 questions
Filter by
Sorted by
Tagged with
7 views

### Is carbon dioxide soluble in petroleum ether, and why?

I googled it, and I'm finding some forum posts that say no, but no authoritative reference. CO2 is somewhat soluble in water (1.7 g/L at 20°C) and I understand that it's mostly NOT because it forms ...
12 views

### Does CO2 form carbonic acid in the atmosphere?

Since when $\ce{CO2}$ goes into water it makes carbonic acid, then what happens when it rains? Some of the $\ce{CO2}$ in the air joins the rain drop as it falls and while the rain drop falls and ...
12k views

### Why does rotating a double bond break the bond?

It is well known that double bonds are "stiff" and make particles less likely to rotate around the bond. But why? What makes it so that the bond has to be orientated a specific way?
13 views

### When alcohol is used to sterilize, what about it changes that it can't be re-used?

I read online that when you use regular household rubbing alcohol to soak something for sterilization purposes, you're then supposed to toss it out. I'm just curious why. Like, as long as there's a ...
20 views

### How to determine if a compound is a strong, weak, or non-electrolyte?

I'm stuck on questions asking whether a given chemical formula is a strong or weak electrolyte in an aqueous solution. I did some research online, but could not get a specific solution that I could ...
6 views

### Vinegar salt reaction to produce acid; does it matter what type of vinegar I use

I am trying to get get hydrogen chloride gas by using the reaction sodium chloride + vinegar = HCl(g) + sodium acetate, does it matter what type of vinegar I use eg apple cider vinegar, malt vinegar; ...
9 views

### Metal nail reaction in wall filler

Please help explain what is happening to this nail. It has been in this wall filler for a good few months. The substance being excreted was rising up forming these stalagmites, with a liquid forming ...
5 views

### What is the N factor of sulphur trioxide and sulphur dioxide in various reactions

As such i got my concept clear in case of redox reactions , but i fail to find n factor for non redox reaction specifiallyin case of SO2 ,SO3 , where i used the total.+ charge or total - chrge concept ...
19 views

### Is it possible to make micelles to pick up Microplastics from water?

I'd like to know if I could get micelles to pick up microplastics in water. I read that microplastics are sometimes charged, so can we make the lyophobic end to pick up microplastics, so that they can ...
3 views

### Calculate protein concentration based on Lowry assay

Calculate the UNKNOWN protein concentration based on Lowry assay method. A standard curve was plotted and the amount of protein added in the unknown protein concentration was calculated based on abs ...
4 views

### SN2 reaction on a chiral carbon atom

What would the mechanism for the treatment of a chiral carbon atom in an SN2 reaction be like. And can you please explain SN2 reaction briefly Thank you
32 views

### Constant Pressure and Temperature during Phase Change

One of the solution guides to a question I was working on said that pressure and temperature is constant for a phase change. I understand why temperature is always constant for a phase change, but don'...
8 views

### Do glow sticks that emit high frequency light require higher activation energy when compared to low frequency light glows sticks?

I realized how people investigate glow stick kinetics using an Arrhenius plot, and was wondering whether a relationship between the glow stick light frequency and its activation energy has been ...
27 views

### What reactions involving hydrazine, dinitrogen tetroxide and possibly a contaminant can produce a salt?

Hydrazine $\ce{N2H4}$ and dinitrogen tetroxide $\ce{N2O4}$ form a hypergolic fuel and oxidizer pair widely used in spacecraft including Akatsuki. Wikipedia states: Hydrazine can be monoprotonated ...
21 views

### What is $\ce{NHO3}$?

Are $\ce{HNO3}$ and $\ce{NHO3}$ the same compounds? If not, what are the differences between them? If so, is one order preferred over the other? Are both acceptable?
639 views

### How was water formed if oxygen and hydrogen exist as molecules?

I have learnt that both hydrogen and oxygen exist as molecules. If so how was $\ce {H2O}$ formed? In water there is two hydrogen molecule and one oxygen atoms but how is this possible? Oxygen only ...
18 views

### What will be produced when sucrose and potassium bitartrate react with each other?

What would happen if sugar and cream of tartar react with each other? Would it create an ester? $$\ce{KC4H5O6 + C12H22O11 -> KC16H21O14 + 3H2O}$$ Is this correct? If not, why?
970 views

### Why are equations of state for a non-ideal gas so elusive?

The ideal gas equation (daresay "law") is a fascinating combination of the work of dozens of scientists over a long period of time. I encountered Van der Waals interpretation for non-ideal gases ...
7 views

### Making Lyophilized Cake Lookalike using household ingredients

I'm working on a machine learning model to identify flaws in vaccines in lyophilized cake form. To train the model, I need a number of samples that look something like this: I have vials, but I'm ...
23 views

### Do glass and plastics NATURALLY crystallise at STP? [on hold]

Diamond, being a higher energy state, convert very slowly to graphite, which is stable at STP. Similarly, do glasses (tempered glass, glasses in lenses etc.) and plastics which are amorphous become ...
13 views

### styrene confusion

I am studying NMR and while looking at styrene, I can't figure out why the two hydrogens on the terminal double bond are not equivalent. Is it because one is closer to the ring in position than the ...
40 views
+50

### What are the degrees of freedom that define the temperature of an ionic solid (such as sodium azide)?

Degrees of freedom describe the different ways atoms move in a sample. For a pure ideal gas made of non-linear molecules, there are 3N degrees of freedom (N is the number of atoms in the molecule), 3N-...
1k views

### Birch reduction of anisole

Hepworth, Waring and Waring (2002) mentions that: In general, electron-withdrawing substituents make the arene more susceptible to reduction, while the opposite applies for electron-donating ...
10 views

### Is there a molecule in which the central atom makes 8 bonds and has an hybridization of sp3d? [on hold]

Doesnt matter what the molecule is, but the central atom has to be sp3d and make 8 bonds
29 views

### Thermal decomposition of K2CO3

K2CO3 doesn't boil - it thermally decomposes at 1200c. However, I find conflicting information online about this. Roughly what I have found say three inconsistent things. (1) It doesn't decompose (...
9 views

### When is the concentration in which you put into the equilibrium constant equal to 1 for solids and liquids?

There are many websites which states that pure liquids and solids have a concentration equal to one, but for some equations they are not! How do you explain the difference for this equation? For the ...
28 views

### How high can compression be in a combustion engine? [on hold]

In order to make combustion engines more efficient by increasing compression I wonder how high compression can be in a combustion engine. Could solid combustibles, like gun powder and similar, be ...
9 views

### What is the product : Reaction of 2,2-dibromopropane with alcoholic KOH [on hold]

What will be the product : Reaction of 2,2-dibromopropane with alcoholic KOH .
13 views

### Will distillation do the job of purifying the water?

I asked about my sophisticated water purification system for a generation ship on Worldbuilding Stack Exchange, and somebody mentioned this: If you're gonna go to all the trouble of distilling it, ...
49 views

80 views

### Which of the resonance structures is more stable?

I am quoting a rule on resonance from Organic Chemistry by T.W. Graham Solomons, Craig B. Fryhle, 12th edition, page 25. Structures in which all the atoms have a complete valence shell of ...
514 views

### Reaction of aqueous sodium carbonate with aluminum foil

Aqueous sodium hydroxide is known to react with aluminum foil in an exothermic, hydrogen-gas releasing reaction like $$\ce{2NaOH(aq) + 2Al(s) + 2H2O(\ell) → 2NaAlO2(aq) + 3H2(g)}$$ However, on ...
14 views

### Can classification techniques used for identifying solids be used to identify precipitates?

I am preparing for an assessed practical experiment where an unknown precipitate must be identified. I know that precipitates are insoluble, and my textbook says they are considered to be solid with ...
25 views

### Determinig the mass of a third isotope [EASY] [on hold]

I am totally new to Chemistry. I am taking my first Physical Chemistry course. And in the exercise sheet i am solving there is the following question : There are three Oxygen isotopes, occuring with ...
17 views

### Free aldol addition and condensation [on hold]

Just had some questions I'm working on that I'd like some help with; what is the mechanism with arrows for the base-catalysed aldol addition and condensation of ethanal with itself (with both steps). ...