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.

Applied to a chemical species, the term expresses a kinetic property in reference to another species. The IUPAC goldbook defines the term reactive:

As applied to a chemical species, the term expresses a kinetic property. A species is said to be more reactive or to have a higher reactivity in some given context than some other (reference) species if it has a larger rate constant for a specified elementary reaction. The term has meaning only by reference to some explicitly stated or implicitly assumed set of conditions. It is not to be used for reactions or reaction patterns of compounds in general. The term is also more loosely used as a phenomenological description not restricted to elementary reactions. When applied in this sense the property under consideration may reflect not only rate, but also equilibrium, constants.

Closely related (and therefore the tag also applies to) is the concept of being unreactive, as defined by the IUPAC goldbook:

Failing to react with a specified chemical species under specified conditions. The term should not be used in place of stable, since a relatively more stable species may nevertheless be more reactive than some reference species towards a given reaction partner.

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 of certain chemical species.

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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 would produce a reaction and what product(s) if any…
Ben Norris
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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 oxygen obviously does not do this, as can be seen…
Vikki
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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 environment, while the analogous methane won't. Is…
Isaiah G.
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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 so I could compare them all in relation to one…
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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 electrons which causing it.
Simon-Nail-It
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Reactivity of Aluminium Oxide

I know that Aluminium Oxide is an amphoteric substance meaning that it reacts with both acids and bases. I recently learned that Aluminium has very good corrosion resistance due to the "Aluminium spontaneously forms a thin but effective oxide layer…
user50225
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How to turn acetaldehyde into acetic acid using one of the five chemicals on the list?

From the Russian State Chemistry Test: It's easy to see $X$ is $\ce{H2O}$: water turns acetylene into acetaldehyde. But what can turn acetaldehyde into acetic acid? I checked: $\ce{NaOH}$ would turn it into sodium acetate, $\ce{CuO}$ would not…
CowperKettle
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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?
Chin Huan
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Reactivity of alkyl halides

I am unable to understand how to decide reactivity of alkyl halides based on inductive effect in a nucleophilic substitution reaction. I have 2 explanation for deciding. Consider 2 alkyl halides: (A) 2-chloro-2-methylbutane (B)…
Akshat
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Reactivity of Ammonium

I was going through some displacement reactions when this struck me: What is the position of the ammonium cation in the metal reactivity series? I can find other positive ions like carbon and hydrogen in my textbook but not ammonium. I tried to…
Shub
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Why are not all metals included in the reactivity series

Why aren't all metals included in the reactivity series? For example why isn't molybdenum included? Now we know that hydrogen displaces those metals from their oxides that are less reactive than iron. But how do I know whether hydrogen would also…
Aditi
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With which 2 of these 5 chemicals would Chlorine not react? N, NaOH, O2, NaBr, Fe

A question in a Russian EGE test asks to choose 2 chemicals out of 5 with which Chlorine does not react: Nitrogen - I checked and it reacts $\ce{KOH}$ -- reacts $\ce{O2}$ -- reacts $\ce{NaBr}$ -- reacts $\ce{Fe}$ -- reacts I'm at a loss. Which…
CowperKettle
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Is the speed of sound the fastest rate that a chemical reaction can progress through a substance?

I read that a martensitic transformation can travel at the speed of sound in that material. Is that confirmed as being the fastest speed of a chemical reaction (transformation)?
user2617804
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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 nose and touching it to the top of the foam. I…
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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 clear) and what is in the bottom milky layer?…
John Hon
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