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2
votes
1answer
237 views

How does one synthesise 2-Monoglycerides from Triglycerides?

How does one synthesise 2-monoglycerides from triglycerides with additional ingredients if necessary? My first instinct would be to add a catalyst for the reaction of $triglyceride \rightarrow 3 FA + ...
5
votes
2answers
1k views

How do you Synthesise a Fatty Acid Amide?

How would you go about synthesising a fatty acid amide, preferably by means of a high-yield reaction. Please provide an explanation that I, as a grade 12 chemistry graduate, could understand. I am ...
8
votes
1answer
1k views

Does sublimation happen only on the surface or throughout the body?

Like evaporation happens only on the surface of a liquid, and boiling/vapourisation takes place throughout the body, how does sublimation occur? Why?
4
votes
2answers
6k views

Why water can't mix with oil or cooking oil?

Why water can't mix with oil or cooking oil (both saturated and unsaturated)?
-1
votes
0answers
793 views

Homework - Ideal gas law [closed]

I don't understand how to find the volume in this problem.. A flask containing 63.2 mL of neon gas was collected over water at 21C and 788 mm Hg. What is this volume of gas at STP? (WVP at 21C = 18.6 ...
6
votes
1answer
9k views

A thermoset or a thermoplastic?

How do you know if a polymer is a thermoset or a thermoplastic? For example: hydroxybutanoic acid 2-amino-3- hydroxybutanoic acid (I am not sure if these are correct in English) I know what ...
7
votes
3answers
272 views

Has the molecular diatomic oxygen trianion been observed or predicted?

Has diatomic oxygen ever been observed with a 3− charge, i.e. $\ce{O_2^{3-}}$? Have any ab intio calculations been done on this ion? Update: Just to summarize some of the answers below and add my ...
4
votes
1answer
5k views

Hypochlorous acid mechanism

When hypochlorous acid is dissolved in water, is it the chlorine atom or the oxygen that serves as the anti microbial agent?
10
votes
2answers
2k views

Why does Naphthalene turn into needle-shaped crystals by sublimation?

I wonder why crystals of Naphthalene are needle-shaped after sublimation. Googling the fact, I could only confirm that it is true but failed to find the reason. Could someone please shed some light as ...
2
votes
2answers
104 views

Is it possible to prevent methane combining with oxygen?

The output from an anerobic kitchen waste digester is mostly $\ce{CH4}$, and $\ce{CO2}$. If the methane is collected over water; algae/moss may use the $\ce{CO2}$ to grow. Yet oxygen is released ... ...
13
votes
2answers
582 views

Why do oxidation numbers work?

I understand that oxidation numbers are a method for keeping track of electrons in a reaction and how they are generally assigned (electrons in a bond are assigned to the more electronegative atom). ...
4
votes
2answers
462 views

What are the major environmental drawbacks with using methane as a combustable fuel?

What are the biggest environmental issues with using methane, $\ce{CH4}$, (which is found as the major energy source in natural gas, shale gas, biogas, and synthetic natural gas), as a combustible ...
28
votes
1answer
602 views

How does Palladium dissociate H₂ so easily?

If I understand correctly, $\ce{H2}$ in the presence of $\ce{Pd}$ readily dissociates as it dissolves into the metal. With the dissociation energy for the $\ce{H—H}$ bond being so large, how is this ...
9
votes
1answer
426 views

Forms of carbon in incomplete combustion

When hydrocarbons burn with little oxygen, carbon is produced. What form do these particulates of carbon come in? Is it a simple molecule like $\ce{S8}$, or a small fragment of a larger structure, ...
12
votes
4answers
8k views

Is it possible to synthesise ethers from carboxylic acids?

Is it possible to synthesise ethers from carboxylic acids, and if so, how? By ether I mean an ether in general ($\ce{R-O-R'}$), not just specific examples. I theorised one could perform Fischer ...
4
votes
2answers
180 views

Correct nomenclature for reaction types

What is the correct name for a reaction like this? $$ \ce{ 4MnO2 ->[500\ ^\circ \text{C}] 2Mn2O3 + O2 ^}$$ Is it a synthesis, or a Decomposition? I tried to find it out with http://en.wikipedia....
7
votes
3answers
81k views

Why does the hydroxide ion have a negative charge?

I've been studying the roles of hydroxide & hydronium in acids and bases, and it was mentioned that a hydroxide ion (OH-) has a negative charge. Can someone give me a layman's explanation of what ...
5
votes
1answer
910 views

Are different enclosing mark types in chemical names needed to differentiate between substances?

What is the significance of enclosing marks in chemical names in determining the uniqueness of a substance (organic and inorganic)? Can a simple change in the type of enclosing mark used indicate ...
1
vote
2answers
989 views

How does 1,3-dichloro-1,3,5-triazinane-2,4,6-trione (dichloroisocyanuric acid) generate hypochlorous acid when dissolved in water?

Can someone draw the reaction that leads to the generation of HOCl when dichloroisocyanuric acid (structure shown below) is dissolved in water?
4
votes
0answers
2k views

How can I find pKa from a titration curve?

I am fully aware that the pKa is the pH at half the equivalence point, but are there some programs or methods I could use to accurately estimate the pKa without manually drawing lines on the graph?
3
votes
3answers
2k views

What are physical properties and chemical properties?

As the question title says, I would like to know what the physical and chemical properties are. If possible, please include examples. Since it seems to be related, I would also like to know what ...
6
votes
1answer
2k views

If I have a chiral substrate, should I always assume that both enantiomers are present?

Considering the Sn1 reaction of (S)-2,3-dimethyl-3-pentanol, knowing that this molecule has a chiral carbon, should I always assume that both enantiomers are present, and therefore the products of a ...
0
votes
2answers
7k views

List in order of increasing radius

List in order of increasing radius: a) Rb, K, C5, Kr For this one I got C, Kr, K, Rb b) Ar, Cs, Si, Al This I got: Ar, Si, Al, Cs Does anyone know if this is correct? I don't have the solution ...
11
votes
2answers
14k views

Why does chocolate ice cream melt faster than others?

The other day I was dipping out Neapolitan(strawberry, vanilla, & chocolate) ice cream and noticed that the chocolate ice cream tended to melt faster than that of the vanilla and strawberry. I ...
8
votes
1answer
559 views

Thiosulphate acidic decomposition

I just came across this reaction $\ce{Na2S2O3 + 2HCl -> 2NaCl + SO2 + S + H2O}$ I was wondering if it was possible to predict the products of this reaction if I didn't know it (or any inorganic ...
8
votes
1answer
2k views

Preparation of alkyl halide from alcohols

$\ce{R-OH + HBr -> R-Br + H2O}$ An $\ce{R+}$ carbocation is formed during this reaction. If $\ce{R}$ is any alkyl group instead of methyl or ethyl, can the beta hydrogen to the hydroxy group be ...
1
vote
2answers
2k views

How should I identify my leaving group in SN1 reactions if there might be more than one option?

Before I can even begin to contemplate the products of a given SN1 reaction, I need to be able to determine what my leaving group will be, which should be a species with a strong conjugate acid, and ...
7
votes
1answer
7k views

What are the products in this SN1 reaction?

I am asked to identify the organic/inorganic products of an SN1 reaction between 3-iodopentane and ethanol. I have identified correctly that the substrate is the 3-iodopentane, the leaving group is ...
9
votes
3answers
2k views

Is electrochemically activated water a real technology?

In essence what I'm asking is if the applications of Electrochemically activated water (ECA water) as a bactericidal-disinfectant is real and profitable (especially this last part). The principle at ...
2
votes
1answer
12k views

Physical state of hydronium

I am doing my chemistry homework and I am supposed to write the products when strong acids react with water, but I am unsure of the physical state for hydronium ions. Should it be liquid (l) or ...
12
votes
1answer
35k views

What's that tangy smell on cheap plastic?

Most cheap items (from China mostly) have a strong tangy odor to the plastics (or some resin, but I can mostly smell it on plastics). The smell is always consistent over a broad range or products and ...
8
votes
1answer
2k views

Simultaneous equilibria

Rephrasing: The following reactions are a small example of my big system $$(1)\ \ce{A + B <=> AB}$$ $$(2)\ \ce{AB -> CB}$$ $$(3)\ \ce{A -> C}$$ $$(4)\ \ce{C + B <=> CB}$$ with $$\...
17
votes
3answers
65k views

Anomalous electronic configuration of platinum

Why is the electronic configuration of platinum $$\mathrm{[Xe] 4f^{14} 5d^9 6s^1}$$ and not $\mathrm{[Xe] 4f^{14} 5d^{10} 6s^0}$ or $\mathrm{[Xe] 4f^{14} 5d^8 6s^2}$?
8
votes
2answers
290 views

How is this mystery chemical reducing carbon emissions?

My chemistry is not good enough to solve this problem, and it's driving me crazy. At my job, a sales agent approached me to be their representative in my area for their product. It's a product that ...
-2
votes
1answer
6k views

SN1 like reaction acid-cataylzed hydrolysis of epoxide [closed]

What would be the reaction mechanism for the reaction between epoxide and $\ce{H2SO4}$?
3
votes
1answer
117 views

Is phenolphthalein used in laminar wood construction panels?

Recently someone is claiming that the laminar wood panels used for building our new primary school contains a "carcinogenic and dangerous compound", namely phenolphthalein. I couldn't find any ...
-3
votes
1answer
552 views

Can we create a galvanic cell with only half a cell connected to the ground? [closed]

I have a question about electrical potential in galvanic cells ,suppose that we have only half a cell wich means that we have only one Ox/Red couple (one metal and the other as ionic solution ...)...
33
votes
5answers
14k views

Why don't the electrons move through the electrolyte (instead of the circuit) in a galvanic cell?

I was learning about galvanic cells and I had a problem understanding why electrons do not travel through the electrolyte solutions themselves, instead preferring to travel through metals. Can ...
2
votes
1answer
3k views

Why should I add lithium bromide to my GPC eluent?

I'm running gel permeation chromatography (GPC) of a polar, uncharged polymer (acrylamide-based) in a polar solvent (dimethylformamide). The literature recommends adding a salt to the eluent; for my ...
6
votes
1answer
1k views

Where did the rest of the elements come from?

There were ninety original elements on the Periodic Table. Over time, new ones were founded and put on. However, they were all either the original elements experimented on. For example, Plutonium was ...
-1
votes
1answer
861 views

What is the specific structure of Poly(allylamine hydrochloride) (C3H7N)n HCl?

I'm working with Poly(allylamine hydrochloride), and I found that the chemical formula is $$\ce{(C_3 H_7 N)_{$n$}. HCl}$$ But I need a diagram like below, but more explicit. I mean with the carbons, ...
17
votes
5answers
7k views

Are there notable organic compunds which look very similar but have very different properties?

I've seen people arguing for some questionable "miracle cure-all" alternative medicines not scientifically, but by their own logic. A common claim is, that if a compound looks very similar to an ...
5
votes
1answer
3k views

In practice, how dangerous is liquid oxygen as an oxidizing agent?

The Wikipedia page on liquid oxygen tells us Liquid oxygen is also a very powerful oxidizing agent [...], if soaked in liquid oxygen, some materials such as coal briquettes, carbon black, etc., can ...
2
votes
1answer
104 views

Alloy-component weight based on desired molecule

I'm a gold smith and I want to start experimenting with non-standard metal-alloys. Now high school is a long time ago for me so while I think I've got this right, I'm just not as sure as I should be ...
17
votes
4answers
4k views

Why are solid phase organics often conjugated to HCl?

Many uncharged organic compounds are sold in solid phase with HCl conjugate - e.g. the antihistamine diphenhydramine.HCl or the derivitizing agent pentafluorobenzyl hydroxylamine.HCl, among many ...
3
votes
1answer
760 views

Why is my NaCl solution seemingly saturated, when I followed the recipe for an isotonic solution?

I prepared an isotonic solution of table salt in water following this recipe: 1 leveled coffee spoon of salt in 0,5L of water. 9g/L would be an isotonic solution, a leveled coffee spoon is commonly ...
5
votes
1answer
198 views

Introduction to modeling chemical reactions

I am looking for introduction to modeling of chemical reactions. I think there is the base approach, where concentrations of chemical species are given, plus ratios of each possible reaction / outcome....
2
votes
1answer
1k views

Can silica gel beads cause silicosis if crushed?

Can silica gel beads (which I believe are amorphous) when crushed to dust cause silicosis?
5
votes
1answer
301 views

Source for thermodynamic and/or transport properties

I'm working on some combustion problems using Cantera and I can't find references for the thermodynamic or transport properties for many of my chemical species. I'm looking for NASA-7 or NASA-9 curve-...
38
votes
4answers
9k views

What exactly is happening when sodium, potassium, or other alkali metal explodes in water?

There are lots of videos on YouTube showing sodium, potassium, etc. exploding when dropped into water (this, for example). I understand that when an alkali metal is exposed to water, a violent ...

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