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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259 views

Alkyl halide reaction

In the following the reaction , According to me the product should be compound (A) due to substitution reaction. But the product formed is the compound (B) , what could be the mechanism for the ...
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297 views

Formal charges can mislead when writing arrow-pushing mechanisms

We know opposing charges attract and like charges repel. By this logic then, in the two examples on the left, the curved arrows would be show the formation of an oxygen-oxygen bond. However, these ...
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Is the variation in carbonation of soft drinks the variable that affects the effectiveness of the mentos reaction?

I went and bought a bottle of Fanta and some Mentos to replicate the famous youtube videos of the big fizzy reaction. The result was dismal, it weakly foamed up and dribbled over the edge. I tried ...
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How to compare the oxidizing power of perhalate ions

In my book the oxidizing power in descending order of the following is given as: $\ce{BrO4-} > \ce{IO4-} > \ce{ClO4-}$ My doubt is regarding their order of oxidizing tendency. I thought that ...
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10k views

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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How can I predict if a reaction will occur between any two (or more) substances?

I am new to chemistry and I find it fascinating. I am trying to learn about chemical reactions and I was wondering if there was an easy way to quickly tell if any combination of chemical substances ...
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1answer
705 views

Why are silyl chlorides more readily hydrolysed than alkyl chlorides?

I know that the $\ce{Si-Cl}$ bond has a slightly higher energy, but silyl chlorides are much more readily hydrolyzed compared to alkyl chlorides. I do not fully understand why that is. My thoughts so ...
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358 views

How to calculate minimum temperature of a reaction?

For burning ethanol (its reaction with oxygen), we need a minimum activation energy (a minimum temperature) to start the reaction. Is it possible to calculate what are the minimum temperatures ...
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1answer
4k views

Is calcium hydroxide or potassium hydroxide more efficient at removing carbon dioxide?

In biology, we commonly use $\ce{KOH}$ in respirometers to remove carbon dioxide. A common test in chemistry to detect the presence of carbon dioxide is to bubble it through limewater, turning it ...
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705 views

Why does selenophene not undergo aromatic substitution?

Other derivatives like thiophene, pyrrole give electrophilic substitution but why not selenophene? Is it because selenophene does not have enough electron donating effect and not having its electrons ...
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188 views

Why does only one reaction occur when so many are possible?

Why does only one reaction take place, although so many would be possible? I'm more of a physics and math guy, so simply "accepting" it without a proper explanation is kind of hard for me. For example:...
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Comparing the reactivity towards aromatic electrophilic substitution reaction

In the following pairs of molecules, which is more reactive towards electrophilic substitution reaction? 1) 1,4-dinitrobenzene or 1,3-dinitrobenzene (don't consider the ortho isomer) 2) benzene-1,...
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Reactivities: interhalogen compounds versus halogens

My textbook says that interhalogen compounds are more reactive than halogens, because the $\ce{X-X}$ bond in halogens (for example, dichlorine or $\ce{Cl2}$) is stronger than the $\ce{X-X'}$ bond in ...
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Why does calcium oxide react with sulfur dioxide?

Which of the following compounds reacts with calcium oxide, $\ce{CaO}$? (a) $\ce{K2O}$ (b) $\ce{Na2O}$ (c) $\ce{SO2}$ (d) $\ce{MgO}$ I thought that since sodium is higher in the reactivity ...
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Is there a reaction between ethanol and aluminum?

Is there a potential reaction that would occur between ethanol and aluminum? If so, would it potentially create anything toxic?
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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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Could any constituent of normal human urine produce a false positive in a Kastle-Meyer test for presence of blood?

From my understanding, one forensic test for the presence of traces of blood at a crime scene is (or was) the Kastle-Meyer test. Doing some research, I understand that in the test, hemoglobin reacts ...
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380 views

How can collission theory of chemical reaction and Law of mass action be connected?

From Wikipedia, Collision theory is a theory ... that qualitatively explains how chemical reactions occur and why reaction rates differ for different reactions. The collision theory states that ...
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2answers
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Why do SN1 reactions prefer tertiary carbons?

I can understand that $\mathrm{S_N2}$ reactions prefer primary carbons, because of the steric hindrance that would be an obstacle. But what is the exact reason that $\mathrm{S_N1}$ reactions prefer ...
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1answer
250 views

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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2answers
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Rate of EAS in chlorobenzene and fluorobenzene

In both chlorobenzene and fluorobenzene, both the halogens show a −I effect where fluorine has more electron withdrawing effect than chlorine. Now, if we consider the mesomeric/resonance effect, ...
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1answer
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Why do displacement reactions occur?

Suppose we have a compound, say copper sulfate. I know that sulfate is a poly-atomic ion, having valency 2. And, in this case, copper also has valency 2. So, to fullfill their 'octet' requirements, ...
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1answer
664 views

Calcium reactivity vs electronic configuration

Calcium is an alkaline earth metal, so it is reactive. But, it has two valence electrons. Don't those two electrons fill up the first energy level? Isn't an atom with a full energy level considered ...
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If glucose can react with phenyl hydrazine to form osazone why can't it react with 2,4-DNP to give positive test?

If glucose can react with form phenyl hydrazine to form osazone why can't it react with 2,4-DNP? Yes I know about cyclic form of glucose and its equilibrium with straight chain and all … I read ...
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2answers
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Do electron donating groups make a molecule nucleophilic?

Do electron donating groups make a molecule nucleophilic? One group, the alkyl group in this example, is electron donating in $\ce{CH3CH2O-}$. Will the molecule be nucleophlic?
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Why is diene more reactive than alkene?

The chemical reduction of 1,3-butadiene with sodium in alcohol gives mainly the 1,4-addition product that is but-2-ene. Under these condition the isolated double bond are not reduced. This suggest ...
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1answer
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What does nutella add to the Coke+Mentos reaction?

Inspired by this question on SFF.SE. The Diet Coke + Mentos experiment has been a popular one for a while now, and I've read a little bit about the science behind it. I recently discovered this ...
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13k views

What determines whether a double displacement reaction will occur?

In normal displacement reactions, reactivity plays a large role and sometimes the reaction doesn't even happen. So is there anything limiting double displacement reactions? For example $\ce{2KI + Pb(...
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If the reactivity of group 1 elements increases down the group, why is this not the case for halogens? [closed]

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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0answers
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Why doesn't 1-cyclopropylethyne give a positive reaction in the bromine-water unsaturation test?

1-cyclopropylethyne has a triple bond: Hence it seems like it should yield a positive unsaturation test with bromine water. But, my book states that the opposite is true. I guess this may be due to ...
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1answer
1k views

What is more reactive towards a cyanohydrin formation an aldehyde or an Ketone?

Which is more reactive—aldehydes or ketones—towards the nucleophilic addition by cyanide to form cyanohydrins?
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Why is phenyl weakly activating?

The susceptibility of a benzene ring to electrophilic attack depends on the type and number of groups bonded to the ring. Activating groups donate/release electrons and increase the electron density ...
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288 views

Why are trifluoromethyl diazirines so stable?

Why are trifluoromethyl diazirines so stable? Trifluoromethyl diazirines stability is well documented, however I am yet to find an explanation of why... Can it be homoaromatic or even aromatic? 2 pie ...
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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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1answer
414 views

Reactivity of propellanes

Why is [1.1.1]propellane considerably less reactive than either [2.2.1]propellane or [2.1.1]propellane as illustrated in the hydrogenation reactions pictured below?
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1answer
705 views

What typically happens to H2 molecules released into atmosphere (with no spark source)?

I'm wondering what happens when $\ce{H2}$ leaks from say a transmission pipe in an unenclosed area. No immediate source of ignition, I know it rises more quickly than helium (x2 I believe) and ...
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3answers
20k views

Is methoxide a better nucleophile than hydroxide?

What is more nucleophilic, $\ce{OH-}$ or $\ce{CH3O-}$? When I look it from the viewpoint of steric hindrance, the answer seems to be $\ce{OH-}$, but when I see it from the viewpoint of extra electron ...
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3answers
3k views

Can aluminum and hydrochloric acid be used to generate hydrogen gas?

I am looking to produce hydrogen gas in a small amount with supplies I currently have. Most of the methods I have seen involve reacting zinc or magnesium with $\ce{HCl}$ to obtain the gas, but I do ...
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Grignard reaction - exchange of groups

Why is this reaction successful: Why doesn't metal-halide exchange occur easily to get Ar-MgCl and R-Br?
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4answers
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Why is it that the least reactive metals are the best electrical conductors?

Silver, Gold and Platinum are amongst the best conductors of electricity, but also the amongst the most unreactive. Since electrical conductivity depends on the number of delocalized electrons (along ...
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1answer
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Is there any reaction between amines and AgNO3?

I found a question in a book about the reaction between $\ce{AgNO3}$ and aromatic/aliphatic amines, but I couldn't find any information about it. What should be the expected reaction mechanism and ...
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1answer
845 views

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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139 views

Predicting reaction among compounds [closed]

Suppose I have a group of organic compounds say A, B, C, D, E, F, G, H. I know their chemical formula and their names. Now there exists a reaction among these compounds but we do not know which ...
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1answer
919 views

Singlet/triplet oxygen cycloadditions

Why can singlet oxygen participate in cycloaddition reactions while triplet oxygen, on the other hand, can't?
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8k views

What is the standard potential of carbon?

What's the value of standard potential of carbon? The hydrogen and Carbon are in the electrochemical series despite being non metals hydrogen has zero potential difference what about carbon?
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3answers
8k views

What is the quickest way to dissolve steel?

What is the quickest way to dissolve a large chunk of steel? I mean a very quick reaction, assuming that the interaction occurs in a sealed or semi-sealed environment? Reaction times of the order of a ...
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1answer
399 views

What are the conditions for liquid metal to be corrosive to another, different solid metal?

I've had already been aware of the fact that metallic aluminum can be degraded by coming in contact with mercury, but also came across another question more recently here explains a similar reaction ...
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2answers
1k views

Does pressure affect non-gaseous reactions?

Pressure holds a great significance when it comes to reactions involving gaseous species. Changing pressure can affect the kinetics and even mechanisms of such reactions. However, does pressure hold ...
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2answers
8k views

How does the temperature of water affect the reactivity of alkali metals acting on it?

There are a few experiments comparing the reactivity of alkali metals with cold water. Is there any purpose to use cold water? Does the temperature of water affect the reactivity of alkali metals?
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Which allotrope of phosphorus is kinetically the most stable?

Which allotrope of phosphorus is kinetically the most stable? I ruled out white and yellow as being quite reactive. Red and black allotropes are both polymeric and comparitively less reactive. ...

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