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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What can be added to hydrochloric acid to make a gel or paste?

I have a bottle of brick cleaner containing 18-20% hydrochloric acid. What can I add to it to make a gel or paste without unwanted reactions? The application is still just cleaning bricks as the ...
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What factors affect the chemical stability of a compound? [closed]

My question is essentially about the factors that make certain atoms in certain compounds leave the compound they are currently in in order to bond with another atom/compound. For example, I've been ...
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Decomposing chemical compounds - Ease of Decomposition [closed]

Someone asked me a question, that which of the following can be decomposed chemically: Ammonia Iron Neon Hydrogen Fluorine My Analysis: At first attempt I answered Ammonia but changed it to 'I can'...
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Reactivity of dinitrogen vs carbon monoxide

As far as I understand, the 3-fold bonds in $\ce{N2}$ (dinitrogen) and $\ce{CO}$ (carbon monoxide) are the strongest among all bonds. This explains why $\ce{N2}$ is inert and not reactive at all. But ...
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Is the activation energy always inversely proportional to the reaction rate?

When I obtained the activation energy using the Arrhenius equation for a 10-minute glowstick (rapid, rigorous reaction), it was almost 4 times that of a 12-hour glowstick (slow, mild reaction). ...
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What is the order of acidity for hydrogens in primary, secondary and tertiary alkanes, alkenes, and cycloalkanes [duplicate]

The bond dissociation energies of C-H bonds in alkanes, alkenes and aromatic compounds decrease in the following order: primary > secondary > tertiary > allylic > benzylic. The weaker the bond, the ...
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57 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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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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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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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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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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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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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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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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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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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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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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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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What's the chemical reaction involved when adding Caesium to water?

According to the Notting Hill and Ealing High School, the reaction of caesium $\ce{Cs}$ with water $\ce{H2O}$ gives the following equation, $$\ce{2Cs (s) + 2H2O (l) → 2CsOH (aq) + H2 (g)},$$ producing ...
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Order of Reactivity of Halogens in Electrophilic Addition

Hello there. Here's a problem that appeared on one of my tests. What is the order of reactivity of halogens in electrophilic addition reaction via formation of cyclohalonium intermediate? I tried ...
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If the reactivity of group 1 elements increases down the group, why is this not the case for halogens?

I was wondering, as you go down a group, the atoms get bigger... This means that the electrons in the outer shell are further away from the nucleus, and so the attraction decreases and it is easier ...
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what makes an acid a strong acid or weak acid? [duplicate]

When my teacher referenced nitric acid as a strong acid, I thought it was strong because it donates more than one H+ per molecule, but then I saw the equation is $\ce{HNO_3}$ and it only donates one. ...
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843 views

Why is fluorine deactivating while OH is not?

Both have 2p-2p overlap and oxygen and fluorine have similar electronegativities but OH is strongly activating while fluorine is deactivating
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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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Propylene Glycol as a water main anti-freeze

We are a young student science group looking for solutions to real world problems. We are currently working on ways to keep our city water mains from freezing in the winter. Our team is researching ...
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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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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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Displacement reactions of Halide ions

I understand that the reactivity decreases as you go down group 7. In displacement reactions the more reactive halide replaces the least reactive halide, but in this question i do not understand the ...
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1answer
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Reactivity of nitrogen oxygen compounds [closed]

I am supposed to find the most reactive compound among the following: $\ce{NO, NO2, N2O, NO3-}$ Is $\ce{NO3-}$ the most reactive because it is an ion or doesn't it being an ion necessarily mean more ...
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2answers
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Reactivity towards SN1 reaction

In the following compounds , we have to find order of compounds of their reactivity towards SN1 reaction. According to me , we should compare carbo cation stability which is formed as an ...
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368 views

How can I detect contamination with acetic acid

how can I detect the contamination with acetic acid in a home brewed spirit? I fear the batch might be spoiled.
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Difference between Oxidation Potential and Ionization Potential [closed]

Ionization potential indicates a substance's tendency to loose electron and become a positive ion. So, a substance becomes ion more easily if it has a lower ionization potential (lower energy needed ...
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1answer
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Why doesn't fluoride ion have highest nucleophilic power (nucleophilicity)?

As you can see from the image above, '$\ce{R3C}$' anion has 1 lone pair '$\ce{R2N}$' anion has 2 lone pairs $\ce{RO}$ anion has 3 lone pairs $\ce{F}$ anion has 4 lone pairs According to VSEPR theory,...
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Reactivity change of periodic table [closed]

How does reactivity change as you move from one side of the periodic table to the other or if you move from the top to the bottom?
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Why do the nitrosonium and nitronium ions act as electrophiles in organic reactions?

Why does nitrosonium and nitronium ion act as electrophiles when each atom in them have a complete octet of electrons? Even if we consider that they are electrophile just because of the fact that ...
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1answer
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Functional Group compatibility in organic chemistry [closed]

As a continuation to the question: Predicting reaction among compounds I found the list of functional group on wikipaedia: https://en.wikibooks.org/wiki/Organic_Chemistry/...
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Why is there no Activity Series for general non-metals?

In school, for determining whether single displacement reactions occur, we use an activity series. There is one for metals, and one for halogens. Why is there none for non-metals in general? Are ...
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Rate determining step

The formation of the cation is the rate-determining step. we can look at this in two ways. Either that a cation is an unstable species and so it will be formed slowly from a stable neutral organic ...
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Could altered silica gel which is releasing its water content when in contact with fire be used as a fire retardant?

Silica gels absorb moisture. I intend to use silica gels as fire retardants. My question is - Is it possible to chemically alter silica gels to release water content when in contact with fire, thus ...
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Stereochemistry. Difficulty seeing no. Of boiling fractions [closed]

Answer given is six . I can't understand it shouldn't it be 4 as they will be optically active
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2answers
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Why is caesium considered the most reactive element and not fluorine? [closed]

Some people say caesium is most reactive element. I thought it to be fluorine as it is the element that reacts with almost all elements (except couple of inert gases). But caesium won't react many of ...
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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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Do copper and ammonium hydroxide react?

According to the activity series positions of copper and ammonium, with ammonium being higher up on the series compared to copper, it would be predicted that ammonium replace copper in a single ...
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How is a metal's relative resistance to oxidation relate to it's position in the reactivity series? [closed]

How does a metal's relative resistance to oxidation relate to its position in the reactivity series?
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What chemicals used everyday will cause an explosive reaction if exposed into outer space? [closed]

What chemicals used everyday will cause an explosive reaction if exposed into outer space?
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Which is the most reactive element in the periodic table? [duplicate]

Which is the most reactive element in the periodic table? Is it francium, caesium, lithium or fluorine?

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