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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Water with Sodium VS Alcohols with Sodium

Why is the reaction between water and sodium more vigorous than that between ethanol and sodium? Also, why does the reaction between sodium and an alcohol becomes less vigorous the longer the ...
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What is the difference between activity and reactivity when discussing elements?

I screwed up on a true/false question that stated that lithium is the most active alkali metal. I answered false, because I remembered that the lower you go in this group, the more explosive the ...
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3answers
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Why would the hydrogen sulfide ion be a better nucleophile than a bromide ion?

Why would the hydrogen sulfide ion be a better nucleophile than a bromide ion? My professor says that hydrogen sulfide ion is a better nucleophile. I thought I could determine the better ...
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190 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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44 views

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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6k 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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How can you predict a double displacement reaction with no precipitate?

Is it possible to predict a double displacement reaction between two ions where the products remain in aqueous solution? I see how you can predict precipitation reactions if you know whether the ...
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51 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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132 views

Requirement of different reagents for bromination of different substituted benzene rings

Consider the bromination reactions of phenol and anisole. We know that the former can be brominated by aqueous bromine, while the latter requires the catalyst $\ce{FeBr3}$ instead. Our teacher said ...
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54 views

Do amides oxidize to double-bonds?

Do amides from primary or secondary amines ever oxidize to a double-bond on the nitrogen? For example, like from an $\mathrm{R \bbox[yellow]{\color{red}{-}}(NH)-(C=O)-R'}$ to an $\mathrm{ R \bbox[...
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153 views

Why is cyclopropylmethyl radical opening so fast?

Ring opening of the cyclopropylmethyl radical is reliable and fast, and so has been used as a radical trap and a radical clock. Could someone please explain what exactly makes this reaction so fast, ...
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411 views

Intermolecular forces between C and Na2O [closed]

I was trying to do an experiment called Pharaoh's Serpent and I read that the intermolecular forces between the $\ce{C}$ and the $\ce{Na2O}$ (formed in the thermal decomposition of the $\ce{NaHCO3}$) ...
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1answer
2k views

How can I predict whether a reaction will occur? [duplicate]

I'd like to know how can I predict if two substances will react. I already know that there's a reaction if one of the products is a weak electrolyte or a precipitate but that leads me to the question: ...
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Material for melting metal oxides

I am constructing an apparatus for high temperature, strong alkaline melts (metal melts), with extremely high oxygen rich environments. Here what I have so far. Iridium is a good candidate - is it ...
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164 views

How do you know if SN1 orSN2 reaction occurs when it is not so obvious? [closed]

For instance, when you have a primary halide with a weak nucleophile, do you think that the reaction mechanism would be SN1 or SN2, neither or would it even be both, like sometime leaving group can ...
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265 views

Why are copper, iron and lead so common in everyday use?

Copper, iron and lead are commonly used around the world in construction, for pipes and in electrical wiring. Why are these used instead of zinc and magnesium?
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What does the following sentence mean - “Li is least reactive but the strongest reducing agent among all alkali metals”

Isn't it contrasting? Is reactivity only concerned with kinetics of reaction ? PS - I am a high school student, probably I might be missing small detail!
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Are there any Endothermic Pyrophoric Substances?

I've recently been reading about pyrophoric materials, specifically as they relate to rocketry, and this made me curious if there are any substances which are the complete opposite of pyrophoric. ...
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532 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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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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6k views

Why don't calcium chloride and sodium nitrate react?

$$\ce{CaCl2 + 2NaNO3 -> 2NaCl + Ca(NO3)2}$$ Why doesn't the above reaction occur? Does it have to do with the metal activity series or solubility rules?
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372 views

Can someone explain the unintuitive ordering in the metallic activity series?

I would understand it if the metallic activity series Li, Cs, Rb, ... Pt, Au corresponded to electronegativity or ionization energy. However, the way it is written, ...
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11k 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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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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1k views

Reactivity of Benzaldehyde between aldehydes [closed]

Are Benzaldehydes less reactive than aldehydes due to the -R Effect of the -CHO group present on the benzene ring?
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Is graphene a combustible material?

Various sources such as https://news.ycombinator.com/item?id=7679154 speculate that graphene will combust at higher temperatures. Is this true? Is the flash point/ temperature of combustion for ...
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181 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
122 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
1k views

Why does neighbouring group participation increase the rate of reaction?

I don't see any reason why the transition state of an SN2 reaction that happens after an internal nucleophilic group attacks(which is known as NGP) would be more stable. In fact, the nucleophilic ...
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179 views

Alkenes v/s Alkynes in two different reactions

Alkynes are less reactive towards electrophylic addition than alkenes. However, in case of catalytic hydrogenation, alkynes are said to be more reactive. Why? Also, if I want to add H+ as an ...
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1answer
366 views

Lab test to compare the reactivity of liquid 1-heptene and liquid heptane

Describe how you would carry out a lab test to compare the reactivity of liquid 1-heptene and liquid heptane. State clearly what the possible results of the test are and what they would indicate. ...
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1answer
154 views

Which of the following releases the smallest amount of energy upon gaining an electron?

$\ce{C}$, $\ce{Rb}$, $\ce{Ga}$, $\ce{Ge}$ I am confused in the sense that I don't know what it means by "released the smallest about of energy upon gaining?" would it be $\ce{Rb}$ because the shell ...
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652 views

Differences between alkyl halides and alkyl tosylates

What are the functional differences between alkyl halides alkyl tosylates? Both halides and tosylates are good leaving groups, yes. But is there chemistry that one will do and the other won't? Etc.? I'...
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653 views

Here are four observations of the reactions of four metals

Here are four observations of the reactions of four metals. Metal F and G react slowly with water Metal H displaces metal G from its chloride salt solution Metal E does not react with dilute acids ...
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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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1answer
175 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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168 views

Does attachment of phenyl to an alkene increases its reactivity towards electrophilic addition reaction?

According to me phenyl should decrease the reactivity as its electron withdrawing nature destabilises the carbocation.
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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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1answer
2k views

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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1answer
310 views

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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20 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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13 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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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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25 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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34 views

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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37 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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357 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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99 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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41 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.