Questions tagged [reactivity]

Applied to a chemical species, the term expresses a kinetic property in reference to another species. The tag should be applied to questions seeking answers with respect to the reactivity (or unreactivity) of a certain chemical compound, species, molecular entity and/or functional groups. It must not be applied to questions about the stability of certain chemical species.

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54 views

Why does the rusting process start from the bent/squeezed portion of iron?

I have noticed that the rusting of iron starts from the squeezed or bent parts of iron piece. I want to know what is the peculiar reason for the observation that rusting starts from bent or irregular ...
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14 views

What exactly is an 'activated' alcohol? Benzylic vs. Allylic vs. Aliphatic

I'm currently writing a report about the oxidations of various alcohols using different catalytic systems. In all papers it is stated that benzylic and allylic alcohols are "activated", while ...
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35 views

How to increase the conversion for the reaction between 2-acetylpyridine and diamine?

I tried refluxing in toluene using activated molecular sieves to absorb any water produced (didn't use Dean-Stark trap as it's a very small scale reaction). This reaction isn't going by changing the ...
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25 views

Why is the bottom white in a lucas test?

Consider this positive result from the Lucas test (adding $\ce{ZnCl2/HCl}$ to a tertiary alcohol): My question is quite straightforward but I can't find the answer. What is in the top layer (thin and ...
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14 views

What is the Reactivity order of alkali metals towards hydrogen?

I had read that reactivity of alkali metals towards oxygen is increasing down the group.But the reactivity of the alkali metals decrease down the group towards hydrogen. The reason given in my book is ...
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1answer
54 views

Why do bubbles form when a reactive metal is placed in a less reactive metal's salt solution?

What is the gas that if formed when a reactive metal is placed in a salt solution of a less reactive metal? Theoretically, it should just be a simple displacement. I know that this question has been ...
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16 views

What happened to the Klopman - Salem equation?

I am relatively new and interested in the field of theoretical chemistry. I just stumpled across the Klopman - Salem equation (https://en.wikipedia.org/wiki/Klopman-Salem_equation). In daily life, ...
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1answer
669 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 ...
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1answer
50 views

Does bicarbonation require water?

In an aqueous solution of $\ce{NaOH}$ exposed to the atmosphere one can probably expect some degree of $$\ce{NaOH(aq) + CO2(g) -> NaHCO3 (aq)}$$ But, what would happen if just a solid block of $\...
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1answer
173 views

Friedel-Crafts Alkylation of Pyrrole [duplicate]

I thought that I already know how the Electrophilic Aromatic Substitution (EArs) for Aromatic rings work but then this reaction was shown to me and I was really sure that my professors didn't bothered ...
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19 views

Why do counterions influence reactivity in compounds such as LAH and borohydride?

My Organic Chemistry text (Klein) provides a "simplified" mechanism for Lithium Aluminum Hydride reductions. He notes that certain elements of the mechanism, such as the "role played by the lithium ...
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27 views

Reaction between chlorine gas and oxygen at 600 degrees Centigrade

Chlorine gas will not normally react with oxygen gas directly at STP. However, would the two react at standard pressure and 600 degrees Centigrade?
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Will Chlorodifluoromethane (R22 refrigerant) react with calcium metal?

I am attempting to recycle or find a use for chlorodifluoromethane, however I do not want to risk venting it into the atmosphere or exposing myself to hydrofluoric acid. Ideally, I would like to ...
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36 views

NaOH vs Polypropylene

This source lists polypropylene as suitable for use with NaOH. However, this paper seems to demonstrate that NaOH slowly degrades polypropylene (even at fairly moderate temperatures). Does anyone ...
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41 views

Highly concentrated NaOH solution at high temperature vs borosilicate glassware and cellulose?

I've read here on stack-exchange that NaOH will react with glass through the following reaction: 4 NaOH + SiO2 ⤑ Na4SiO4 + 2 H2O I would like to briefly heat a highly concentrated NaOH solution to ...
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1answer
30 views

What effect does a quaternary ammonium compound have on uric acid (urine)

What effect does an Amine based quaternary ammonium compound have on urea/uric acid? Will an amine based quaternary ammonium product react with uric acid and get rid of the smell?
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84 views

Why do the induction effects of fluorobenzene decrease electrophilic addition reactivity, conjugation effects increase selectivity?

Fluorobenzene shows signs of both the electron withdrawing and electron donating groups on benzene. Electrophilic substitution to the ring is less reactive because the fluorine is very electronegative ...
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563 views

Will silicon dioxide react with hydrochloric acid?

I have the following equation, based on the reaction of $\ce{SiO2}$ with $\ce{HF}:$ $$\ce{SiO2 + HCl -> SiCl4 + 2 H2O}$$ I want to know if this reaction is indeed feasible, what conditions may be ...
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1answer
165 views

why lithium is less reactive than sodium? [duplicate]

Lithium lies above sodium in a group and is also smaller in size. According to periodic trend reactivity decreases from left to right in period and down the group.
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2answers
460 views

How to dissolve calcium sulfate fast?

I would like to dissolve $\ce{CaSO4}$ in a hardened condition (e.g. gypsum board) as fast as possible. I have seen in posts about $\ce{CaSO3}$ that vinegar and sulfamic acid are able to dissolve it. ...
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0answers
121 views

Why is the HOMO always lower in energy than the LUMO?

We say that increasing the energy of the $\ce {HOMO}$ of molecules increases their reactivity towards electrophiles while decreasing the energy of the $\ce {LUMO}$ increases their reactivity towards ...
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1answer
174 views

At what acid concentration does potassium metabisulfite react?

I'm in the process of developing a well preserved food-stuff containing potassium metabisulfite and a number of acids (acetic, ascorbic, malic, tartaric, citric, lactic). Wine-making literature ...
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98 views

Why are “diene” structures in the C-ring of anthocyanins singled out for their singlet-oxygen quenching ability?

Anthocyanins are a class of water-soluble vacuolar pigments. They are sensitive to pH, and can undergo a series of structural changes according to a pH-dependent equilibrium as illustrated in Figure 1....
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1answer
52 views

Why does nose grease knock down the head on beer and soda?

Freshman year, my first semester, I was taught many things. One important trick I learned was when I was passed a beer in a 12 oz. plastic cup, I could eliminate the fresh foamy head by wiping my ...
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1answer
169 views

How do I decide whether ring will expand in this reaction or not?

Attempt: After forming the carbocation adjacent to the cyclopropyl ring I had two options, $\ce{Cl-}$ then and there without any changes Expand ring, form a new carbocation and add $\ce{Cl-}$ ...
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1answer
187 views

Equation for reaction between chlorine fluoride and potassium bromide

The equation given in the answer key was $$\ce{ClF + 2KBr → KCl + KF + Br2}$$ However won't the $\ce{KCl}$ also react with $\ce{ClF}$ to form $\ce{KF}$ and $\ce{Cl2}$, resulting in the net reaction ...
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1answer
244 views

Which is easier, the nitration of toluene or the nitration of mesitylene (1,3,5-trimethylbenzene)?

Does the toluene can undergo nitration easier than mesitylene (1,3,5-trimethylbenzene), due to the high repulsion that will occur between $\ce{NO2}$ and the two adjacent methyl groups (in mesitylene ...
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2answers
246 views

Derivation of Gibbs free energy formula

Okay, so I'm trying to derive an important formula which states that - ∆G(r) = ∆G° + RTln( RQ ) where ∆G(r) is the instantaneous rate of change of Gibbs energy with ...
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2answers
155 views

How could mass increase when sulfuric acid is added to calcium carbonate?

Context: I was doing an experiment in class that investigates the rate of mass loss over time when $\pu{20 mL}$ of sulfuric acid is added to $\pu{5g}$ of calcium carbonate. I did the experiment 3 ...
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1answer
154 views

Why is liquid oxygen more reactive than gaseous oxygen?

Liquid oxygen is somewhat hairy to work with, as, if it comes in contact with essentially anything combustible, it has an unfortunate tendency to detonate violently if looked at sideways. Gaseous ...
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1answer
43 views

What is the reason for more stable keto form to tautomerise to a less stable enol form?

In the mechanism of SeO2 I have seen that a more stable keto form first converts to a less stable enol form and then yields a diketone. I have seen many other reaction where the reactant converts to ...
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43 views

Is the water absorbed by sodium polyacrylate available to react?

I'm curious whether the water absorbed by sodium polyacrylate would react with alkali metals, or be trapped by the sodium polyacrylate.
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1answer
495 views

Order of reactivity of hydrogen halides

Solomon and Fryhle $11^{th}$ edition says : Order of reactivity of HX in the acid catalyzed conversion of alcohols to alkyl halides follows the order : HI>HBr>HCl We can account for this by saying ...
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1answer
220 views

In a galvanic cell why does using a more reactive metal increase the voltage?

As the title says, why does using magnesium produce a higher voltage compared to using zinc when reacting with iron? Im having trouble figuring out why the voltage changes. magnesium+copper > zinc+...
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1answer
72 views

Does aluminum oxide react with rubidium?

I have rubidium vapor inside of the vacuum chamber. Inside the vacuum chamber, there are two flat stainless steel coated with aluminum oxide at temperature ~100 °C. Since rubidium is active, I am ...
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1answer
56 views

Rationalising the reactivity of phosphoryl chloride

$\ce {POCl3}$ is a reagent well-known for enacting various functions in organic synthesis. For example, together with pyridine, it is able to dehydrate alcohols to give alkenes. Also, reacting it with ...
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1answer
1k views

Reaction between NaOH and Carbonic acid

I was presented with the following reaction when we were just learning about acids and bases: $$\ce{2NaOH + H2CO3 -> H2O + Na2CO3}$$ however I had thought it might've been something like $$\ce{...
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2answers
470 views

Reactivity of primary and tertiary alkyl halides

From USNCO 2004, Q58: The reaction between which pair of reactants occurs the fastest for $[\ce{OH-}] = \pu{0.010 M}$? (A) $\ce{CH3CH2CH2CH2Cl + OH-}$ (B) $\ce{(CH3)3CCl + OH-}$ (C) $...
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0answers
82 views

Where will a H+ attack on 6-hydroxyhexan-2-one? [closed]

Where will a H+ attack on 6-hydroxyhexan-2-one? Protonation can take place either on the ketone or the alcohol. So where will it attack? In short, on which of the two oxygen atoms is electron density ...
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4answers
778 views

Which is more reactive, chlorine radical or chloride ion?

Ions are very reactive for obvious reasons (i.e. Coulomb force); $\ce{Cl-}$ ions will be very quick to form an ionic bond with positive ions (unless inhibited, e.g. through being in a solution; let's ...
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1answer
29 views

Would atomic oxygen and atomic hydrogen result in O2 and H2 only, or some H2O too? [closed]

Let's assume we have atomic oxygen and atomic hydrogen in a closed chamber, the temperature and pressure of which we're able to monitor (and control). Number of hydrogen atoms are twice that of oxygen....
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1answer
776 views

How is fluorine gas contained and transported, why aren't the metal cylinder and tube in this video attacked?

I included the GIF below as part of an answer to Can paper burn without oxygen or air?. It was made from the video Fluorine - Periodic Table of Videos. I noticed that the cylinder containing the ...
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3answers
2k views

How does ring size affect SN2 reactions?

Suppose we have to compare the $\mathrm{S_N2}$ reactivity order for cyclopropyl and cyclopentyl chloride. How can we do that? I think that cyclopentyl should be more reactive towards $\mathrm{S_N2}$ ...
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1answer
354 views

why fluorine and oxygen have different behaviour towards electron gain enthalapy and electronegativity? [closed]

I have seen following definitions in my textbook: Electron gain enthalapy may be defined as enthalpy change taking place when an isolated gaseous atom of the element accepts an electron to form a ...
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0answers
70 views

Reactivity of carbon-centered radical

I've read this site for a long time but I had never asked a question, so this is my first time :). So, i'm currently working on a computational chemistry project on radical cyclization reactions and ...
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2answers
108 views

Reactivity of fluorine compound

I have tried to make sense of the article on fluorine on Wikipedia but I am still very perplexed. I would like to know generally how reactive the fluorine compound β-(4-Fluorophenyl)-γ-aminobutyric ...
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0answers
55 views

How to predict and measure excess values of reactivity ratios for copolymerization with three monomers?

I ask this question because I haven't found interesting literature on the subject and I would like to know if my way to think is good or pure bullshit. Also the question is quite long because I have ...
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1answer
198 views

Does chlorine trifluoride react with candlewax?

I've run across references to chlorine trifluoride quite a lot. It pops up fairly regularly on the Worldbuilding SE, and whatever idea people have with it is usually shot down very quickly - For ...
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1answer
181 views

Metal reactivity with hot water VS HCL

Does being able to react with hot water take more metal reactivity than being able to react with HCl? To me, it seems like a metal would need to be more reactive to be able to react with hot water ...
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1answer
125 views

Can nitrogen dioxide react with plastics of any kind? [closed]

I have searched a lot on the internet but couldn't find any helpful thing. My question is that can nitrogen dioxide react with plastics of any kind?