# All Questions

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43 views

### Would the detaching of dendrites from electrodes in a cell, result in the crystal dissolving back into the electrolyte?

Dendrites that form on the electrodes of cells shorten the cell's lifetime, and result in reduced capacity before the end of life. If the dendrites could be detached from the electrode, would they ...
3k views

### Identifying a glass frosting chemical

I have purchased an "unknown" white coloured powder from the market which can frost glass objects. Here are some properties of this powder White in colour When mixed with HCL or water, it results in ...
343 views

### Clogged drain, commercial products are ineffective

I have a clogged drain from my shower. Commercial products like Savo or WC Net totally don't work. Is there any chemical substance which can be bought without permission or which can be made easily to ...
202 views

### When considering Van der Waals forces, why do dipoles form?

Imagine two atoms, and only consider the Van der Waals force. The electron cloud will jitter due to its quantum mechanical nature- some of these jitters forming dipoles, some not. However, on average ...
672 views

### Separating NaClO from its aqueous form in bleach

I was wondering, can I separate the $\ce{NaClO}$ from the $\ce{H2O}$ in bleach. The decomposition point for $\ce{NaClO}$ is $374.14\ \mathrm{K}$, so I'm risking decomposing the compound if I do simple ...
417 views

### In orbital hybridisation, what determines the number of orbitals that hybridise to be at the same energy level?

For example, in phosphorus pentachloride five orbitals hybridize, but why not 6, as in the hydrated Al ion? I have read that the reason six orbitals hybridize is that a maximum of six oxygens can ...
1k views

### Which element is being reduced in this reaction?

Which element is reduced in this reaction: $$\ce{2KMnO_4 +3NaSO_3 +H_2O ->2MnO_2 +3NaSO_4 +2KOH}$$ I am trying to figure out which elements lose their electrons, but how am I supposed to know ...
4k views

### Why are isomers difficult to separate?

I recently learned that attempts to compare the spectra of two isomers of $\ce{C_3H_3^+}$ were frustrated by the difficulty of separating the two species. What makes these isomers difficult to ...
225 views

2k views

### Specific heat capacity and the periodic table

Can someone explain me how can I use the periodic table in order to find the specific heat capacities of some elements? (for example, of Aluminium ) The question I have encountered is as follows: ...
131 views

### Materials used in metallic glass

I've been looking over the lists of materials used together to make metallic glass. Is it purely coincidental that if you round up/down any decimals from the atomic weight of elements used to ...
609 views

### What's the name of this electrolysis device?

I've seen it in a couple of videos, it's used to electrolyze water in 2 different containers at the same time to make a comparison and thus is very handy. What is it called (besides just a ...
5k views

### What are the chemical reactions behind fire?

I've always wondered what the chemistry behind fire is. What are the basic chemical reactions behind a simple wood fire, and how do they manifest into this phenomenon?
4k views

### Which species dissociate completely in ionic equations?

I am tasked with writing a molecular equation, an overall ionic equation, and a net ionic equation for the reaction between an aqueous solution of phosphoric acid, $\ce{H3PO4{(aq)}}$ and an aqueous ...
677 views

### Proper IUPAC name of a substituted cyclohexenol

Here's the molecule: So far I've tried: 6-methylcyclohex-2-en-ol and 4-methylcyclohexen-3-ol but both are wrong. I'm rather confused as to where I should start: the alcohol or the double bond?
5k views

### Is there a way to detect bleach residue on a surface?

I was wondering if there is a way to detect for presence or residue of bleach using household items. I am curious about either chlorine-based or peroxide-based. It can be any sort of reaction that ...
4k views

### How does Phosphorus Pentachloride bond?

The thing I am having trouble with: why does $\small\ce{PCl4}$ form a +1 ion and $\small\ce{Cl}$ a -1 ion?
157 views

### How are crystals formed from a gas?

In crystallization, crystals are formed from liquids by cooling. How can crystals be formed from a gas by cooling?
18k views

### Is there a way to calculate how fast water will cool?

Is there a way to calculate how fast water will cool if you know the water's starting temperature and temperature of the environment that you put it in, such as a freezer?
56k views

### Order of elements in a formula? [duplicate]

Possible Duplicate: Why is methane's molecular formula conventionally “CH4”, while water is “H20” (among others)? If I have a formula containing 4 hydrogen atoms and 1 ...
9k views

### Chemical reactions with a room-scale cooling effect

Are there chemical reactions that could cool down an average sized room by a noticeable amount (say 5 °C)? I would like to investigate if it is possible to have a situation where I can mix 2 ...
134 views

### Should the anode potential be increased or decreased to generate current?

I am taking a course on fuel cells and we were talking about the activation energy needed to start a chemical reaction. I would think that the answer to this question is that the anode potential ...
3k views

### What is the electron dot structure of an alkyne? [closed]

I am trying to determine the electron dot structure of an alkyne like $\ce{C2H2}$. I know that hydrocarbons with at least one carbon-carbon triple bond are called alkynes, and their general formula ...
438 views

### Shape of C₂H₂ molecule

What is the shape of the $\ce{C2H2}$ molecule? The fact that is has a triple covalent bond between the 2 carbon atoms and 2 other bonding pairs between the hydrogen and carbon atoms leads me to ...
10k views

### Boiling point of vodka

What is the boiling point of vodka? I have found the boiling point of ethanol, ~173 (degrees) F. However, I am unable to find the boiling point of vodka. I found some information on it, but I do not ...
3k views

### Options for long term storage of helium?

Specifically, if I wanted to purchase a large amounts of helium, what are my options for purchasing helium in a state that is suitable for long term storage? It's my understanding that if I were to ...
385 views

### The Evans auxiliary: rotational freedom of the benzyl group - stereoselectivity still guaranteed?

I created the L-Phenylalanine based Evans auxiliary bearing a benzyl group with help of a molecular model set and got into some questions. The structural formula will do: As I suppose a low ...
2k views

### How do I balance the combustion reaction of butene?

I have butene being burned in a fuel rich engine and I can't seem to balance this reaction: $$\ce{C4H8 + a(O2 + 3.76 N2) -> b CO2 + c H2O + d C4H8 + e (3.76 N2)}$$ When I try write ...
983 views

### Understanding the rate of change in titration curves

As I am looking at titration curves, a few things stand out. For now, I have a two part question: When titrating an acid with a base, for instance, the pH rises more or less abruptly around the ...
613 views

### Can caffeine be separated from coffee?

Is there a way to extract caffeine from coffee completely?
3k views

### Why does polonium form acidic oxides?

All metals form basic oxides. Metallic oxides are basic in character. Polonium is a metal, so it should form basic oxides but it forms acidic oxides. Why are its oxides acidic in character?
414 views

### How does hot tub “shock” work?

Hot tub shock is potassium peroxymonosulfate. When added to a hot tub, it creates bubbles. It is said to oxidize organic debris in the water. What is the reaction?
287 views

### Is ash fireproof?

At high temperatures (almost) everything burns to ash. Is ash 'fireproof'? Is further combustion of ash possible for example by combining with hydrogen, oxygen, etc?
So many atoms can be surrounded by oxygen atoms to make anions - chromate, phosphate, etc. In particular there's Tellurate $\ce{TeO4^{-2}}$, Selenate $\ce{SeO4^{-2}}$ and Sulfate $\ce{SO4^{-2}}$ - ...