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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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Should I expect any surprise when trying to shoot green fireballs like this?

I wanted to use flash cotton (nitrocellulose) to ignite fireballs with an electric trigger. In order to make green fireballs, my attempt will be to put some drops of boric acid solution on each (...
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4answers
21k views

Why is zinc more reactive than copper?

In terms of electronegativity, from what I understand electronegativity increases going across the period, so surely this should mean that zinc less readily loses its outer shell electrons than copper?...
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What makes R-MgX a more reactive Grignard reagent than R-Cu?

What makes $\ce{R-MgX}$ a more reactive Grignard reagent than $\ce{R-Cu}$? Has it to do with solvation, bond enthalpy, electronegativity?
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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 ...
6
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1answer
10k views

How can the iron in the reaction of iron (ii) chloride and zinc not go to zero oxidation state?

I know that the zinc half equation would be $\ce{Zn -> Zn^{2+} + 2e-}$. However I am confused about the half equation for iron. I would think that since iron is completely displaced, its oxidation ...
6
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7k views

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. ...
6
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1answer
514 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 ...
6
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2answers
4k views

How do we know whether we will get a mono substituted or tri-substituted product during electrophilic aromatic substitution?

For example consider the bromination of phenol we get the tri-substituted product (even though bromine is deactivating so I suppose it should deactivate the ring with each addition) while sulphonation ...
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Why does free silicon react with water?

Free silicon is not found in nature (in water, it might be present in the form $\ce{Si(OH)_{4}}$. Some compounds of silicon, such as silane ($\ce{SiH_{4}}$) will react spontaneously in an aqueous ...
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1answer
4k views

Why are carbonyl compunds more reactive towards catalytic hydrogenation than alkynes and alkenes?

Alkynes are more reactive towards catalytic hydrogenation than that of alkenes, because they are more unsaturated. This is the correct reasoning, right? But why are carbonyl compounds more reactive ...
6
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1answer
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Why is benzenediazonium fluoroborate water insoluble and stable at room temperature?

Benzenediazonium fluoroborate is water insoluble and stable at room temperature. Why is this salt, water insoluble? Also I am told that benzenediazonium salts are stable only at low temperature(<5°...
6
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1answer
232 views

Electrophilicities of carboxylic acid derivatives

I would like to ask about the rate of hydrolysis for 4-hydroxyphenyl acetate (A), N-(4-hydroxyphenyl)acetamide (B), 4-hydroxyphenyl chloroacetate (C), and methyl 4-hydroxybenzoate (D). I know that ...
6
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1answer
15k views

Dehalogenation of vicinal dihalides

Why, among different metals, only zinc is favourable for the dehalogenation of vicinal dihalides?
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1answer
331 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
43k views

How can I relate the reactivity series to electronegativity and ionization energy?

I am trying to figure out how the reactivity series comes about. My understanding is that elements with a higher electronegativity will be more reactive than elements with a lower electronegativity, ...
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SN1 reactivity order for chloromethyl methyl ether and trityl chloride

Compare the reactivity order towards SN1 reaction for: (2-chloropropan-2-yl)cyclopropane $\ce{CH3OCH2Cl}$ $\ce{Ph3CCl}$ Owing to the exceptional stability of cyclopropyl ethyl ...
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2answers
417 views

Comparing nucleophilicity

We have to compare the nucleophilicity of $\ce{OH-,NH2-,CH3CH2-}$ and $\ce{CH#C^{-}}$. I managed to find out that $\ce{CH3CH2-}>\ce{NH2-}>\ce{OH-}$ and that $\ce{CH3CH2-}>\ce{CH#C-}$. But I ...
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0answers
197 views

Solve this chemical or biological mystery

I hope this is the best place to pose this unique question. Please forgive me if it's not. I went into a closet to get a prescription medication that was filled about a year ago. The label on the ...
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5answers
425 views

Can halogens exist in their elemental state in nature?

Question 7 from the 2015 Australian Chemistry Olympiad was: Which list below gives non-metals that can be found in their elemental form in nature? (a) neon, phosphorus, fluorine (b) helium, ...
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1answer
785 views

Comparing SN2 reaction rate for phenacyl chloride and methyl chloride

KI in acetone undergoes $\mathrm{S_N2}$ reaction with (1) and (2). Compare the rates of the reactions. Like many kinds of these questions there are many factors involved. One is the steric ...
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1answer
2k views

Is graphene chemically reactive?

Different internet sources say different things. If possible, can someone explain why it is (or isn't) chemically reactive?
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549 views

How can I work out what reaction will happen?

I have recently started learning chemistry, and I've been reading a GCSE (UK high school level) textbook on the stuff :D Much of it has been fairly straightforward, though there has been a ...
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4answers
742 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 ...
5
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1answer
256 views

Why is the alkene a more stable species in this case?

How can we account for $\mathrm{S_N1}$ substitution in this case versus elimination in others? When we dehydrate alcohols, we usually carry out the reaction in concentrated sulfuric acid and at ...
5
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1answer
346 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
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Phenol or ethanol as a nucleophile for ether formation?

If we react phenol with $\ce{C2H5I}$ in $\ce{C2H5O- Na+}$ (excess), $\ce{C2H5OH}$ (anhydrous) solutions . In this reaction why is diethyl ether not formed and the actual product is phenyl ethyl ...
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1answer
151 views

Do epoxide rings react with bases?

We've learned in class that epoxide ring openings can be catalyized with acids, and I seem to recall either the professor or a classmate mentioning that they also react with bases, but some quick ...
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2answers
1k views

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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1answer
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SN2: Neopentyl halides and methyl halides

Two part question for you. Let's preface this with I'm in organic chemistry 1, so we're just learning the basics of these reactions. Are neopentyl halides completely inert to any reaction through any ...
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1answer
112 views

Nucleic Acids Bonds

In a paper I am reading regarding instability and decay of DNA, the author says: "The chemical price paid for the greatly increased resistance of the nucleic acid phosphodiester bond (gained by ...
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1answer
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When, how and why does sodium metal react with cycloalkenes, cycloalkadienes, cycloalkatrienes?

I've been searching for the conditions necessary for the reaction of sodium (Na) metal with cycloalkenes, cyclo-di-alkenes, cyclo-tri-alkenes all over the internet but I cannot find a proper answer. ...
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1answer
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Reaction between magnesium metal and sodium hydroxide: Does this even happen?

Came across this question in a book: Among aluminum, zinc, tin and magnesium, which metals (if any) will react with an aqueous solution of sodium hydroxide to displace dihydrogen? The answer to ...
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1answer
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Why do Grignard reagents or Organolithium compounds not displace halides as easily as acetylide ions do?

This is a snapshot from LG Wade Organic Chemistry. I have a doubt with a particular statement in the book. It says that Grignard reagents do not displace halides as easily as acetylide ions do. But ...
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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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0answers
86 views

Advanced Quantum Chemistry Reference for Reactivity Phenomena

I'm currently in organic synthesis seeking to develop quantitative "physical" (that of a physicist), rather than "chemical", intuition for areas where traditional VSEPR/ MO models cannot fully ...
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1answer
223 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 ...
4
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1answer
860 views

Why would I not see a reaction between aluminum and tin(IV) chloride?

I was performing an experiment where I was supposed to construct a modified activity series between certain elements. I decided to use chlorides with the other metals for single replacement reactions ...
4
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1answer
275 views

What drives a molecule/atom towards stability? [duplicate]

I'm very familiar with the concept that chemical reactions occur because the reactants a state of stability via the reaction. It's a very satisfying and fulfilling statement. But my question has ...
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3answers
3k 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 ...
4
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3answers
2k views

Reactivity series of metal

I have learned about metal and their reactivity series. However, why metals have different reactivity? What are the factors of different reactivity rate for metal? All I can think of is the number of ...
4
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3answers
11k views

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
2k views

Why do Grignard reagents react with epoxides but not THF?

THF is used as a solvent for Grignard reagents, but epoxides react with Grignard reagents. There is only a small difference between epoxides and THF, what causes the difference in reactivity towards ...
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1answer
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Difference between Side Chains and Functional Groups

From what I've read, a functional group seems to be a specific case of a side chain, but this group must be directly responsible for some of the chemical characteristics of the molecule. However, in ...
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2answers
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Why is allyl chloride more reactive towards substitution than alkyl chloride?

I can understand that the reactivity of alkyl halide is more than vinyl and aryl halides because the halogen atom in alkyl halide is connected to the sp3 carbon. Whereas in vinyl or aryl the halogen ...
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2answers
2k views

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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1answer
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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
78 views

Reactivity of magnetized materials

Does the magnetisation process affects the reactivity of a magnetic material? Does the electronegativity change if a metal is magnetised?
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1answer
980 views

Grignard reagents react with epoxides but dissolve in THF, what happens in oxetane (four membered ether ring)?

Ring strain causes the epoxides to react and THF does not react because the ring strain is not large enough. Does the four membered ring react or not? Does it favor reaction with the harder or softer ...
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1answer
502 views

Why are fluoride ions (and ions in general) reactive?

Please bear with me—-I have a pretty meager background in chemistry but am trying to learn some! My question is about ion reactivity—-specifically of the reactivity of $\ce{F-}$. I often hear that ...
4
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1answer
389 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 ...