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Questions tagged [decomposition]

For questions about the decomposition of any chemical species, under any certain conditions.

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Thermal decomposition of ester [closed]

I have a clear liquid with a faint sweet smell. I know this compound contains an aromatic group and an ester. However, something strange happens when I try to distill it - it forms a white solid. I ...
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Decomposition of Sugar Temperature

I am perplexed by information on the internet about the sugar raffinose. The melting point of raffinose is 244.4°F The boiling point of raffinose is 1,623°F I can't find the temperature at which it ...
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1answer
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Determining the formula of tin(II) chloride hydrate [closed]

$\pu{1.20 g}$ of hydrated tin chloride decompose to form $\pu{1.01 g}$ of anhydrous tin chloride on heating. Calculate the value of $x$ given $$\ce{SnCl2.xH2O -> SnCl2 + x H2O}$$ I done it ...
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The thermal decomposition of NH4Cl [closed]

When you heat $\ce{NH4Cl}$ it decomposes into $\ce{NH3 + HCl}$ gases. My question is why does it decompose into ammonia and hydrogen chloride gases on the molecular level. Is it because in the $\ce{N-(...
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Mechanism for removal of pesticides from fruit by sodium bicarbonate

When Googling around for methods to remove pesticides from fruits and vegetables, a study commonly referred to from some news sites (e.g. here and here ) is one where soaking apples in a sodium ...
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1answer
61 views

Hydrate decomposition equation steps

When a hydrate decomposes it loses water molecules in steps. Does each step have a chemical equation? If so is the following equations for decomposition of cupric sulfate hydrate correct? $$ \begin{...
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2answers
161 views

Can we combine two reactions and then calculate the equilibrium concentrations?

At a certain temperature, $\ce{N2O5}$ dissociates as: \begin{align} \ce{N2O5 (g) &<=> N2O3 (g) + O2 (g)} & K_1 &= 4.5 \end{align} At the same time, $\ce{N2O3}$ also dissociates ...
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What is chemical decomposition in the context of a crystal or amorphous solid?

The IUPAC Gold Book definition of chemical decomposition is: The breakdown of a single entity (normal molecule, reaction intermediate, etc.) into two or more fragments. That is a very general ...
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1answer
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Decomposition vs Combustion reaction

I'm balancing chemical equations, and I came across the following: $$\ce{O2 + C4H9NH2 -> CO2 + H2O + N2}\tag{unbalanced}$$ My initial reaction was that it is a combustion reaction. According to ...
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1answer
57 views

Will gamma radiation cause “thermal” decomposition of sodium bicarbonate?

I am conducting research for a new drug that contains powdered sodium bicarbonate, and the drug will need to be sterilized after placement into it's container/closure system. Typically, this is ...
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1answer
507 views

How long does it take for nitric oxide to turn into dinitrogen and dioxygen?

I'm new to chemistry and am studying nitric oxide as a combustion accelerant. Nitric oxide is said to be a free radical. People say that nitric oxide, by itself, is pretty stable. But I saw that $$\...
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Why does lithium aluminium hydride appear grey?

Commercial lithium aluminium hydride is a grey compound, which loses a lot of reactivity the darker it is. Luckily you can clean it up to get the reactive white compound and the separated grey ...
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1answer
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How do you stop a Pharoah's Serpent reaction?

I am a novelist and working on a book. I have been searching google for an answer to the above question. How does one stop a Pharoah's Serpent reaction? Thanks!
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2answers
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Why is it so hard to turn plastics into something useful or decompose it? [closed]

Even after so many years, why haven't we yet come up with a solution to the plastic problem ? Why are plastics so hard to decompose via chemical or physical processes into something harmless or ...
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1answer
79 views

Dissociation energy of benzene dimer

It is known that the benzene dimer has two stable structures, T-shaped ($\ce{C_{2v}}$) or parallel-displaced ($\ce{C_{2h}}$) structure. Now the question is: does the dissociation energy ($\ce{D_0}$) $...
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What are the crystals that have formed around the top of a conc. nitric acid bottle?

I was looking through my chemicals cupboard and found that this decades-old bottle of conc nitric acid had grown a beard. I can't think of any reaction between (presumably) $\ce{NO2}$ and any airborne ...
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1answer
196 views

Why is ordinary soap and water adequate to decontaminate possible nerve agents?

In the news it was announced that anyone who might have been exposed in the recent Salisbury nerve agent incident should wash any potentially contaminated clothing as normal using regular detergent ...
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1answer
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What is the order of the catalytic decomposition of hydrogen peroxide?

I recently did an experiment to determine the activation energy of the decomposition of hydrogen peroxide using iron (III) chloride as a catalyst. I repeated this experiment at different temperatures. ...
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0answers
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Are there any compounds with these properties? [closed]

I'm looking for a chemical compound that satisfies the following criteria: Solid at room temperature Decomposes into gases, primarily oxygen when supplied with an electrical current, preferrably ...
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0answers
47 views

How long can solid DPPH powder last for in terms of shelf-life before its free-radical status is quenched by the atmosphere?

I am writing in my research on the free-radical scavenging activity of various flavylium compounds. I may need to have DPPH shipped as a result of a lack of supply; I am just wondering what sort of ...
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2answers
1k views

How to make ammonia from urea?

The chemical formula of urea is $\ce{CO(NH2)2}$ or is sometimes written as $\ce{CH4N2O}$. How would I decompose or precipitate the $\ce{CO}$ from urea to get ammonia? I know that in the olden days ...
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0answers
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terminology for breakdown of liquid dielectric under the application of high voltage

I saw a diagram a while ago of increasing voltage (x-axis) and what seemed to be the chemical decompositions of ethylene glycol as it occurred at various applied voltages. (I am not a chemist- sorry ...
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2answers
1k views

Decomposition of LiNO3

I have a doubt about decomposition of alkali metals. Why does $\ce{LiNO3}$ decompose to give $\ce{Li2O}$ and $\ce{NO2}$ where as other alkali metals decompose to give corresponding nitrite and oxygen?
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Shelf life of 1,4-Butanediol, colloquially known as BD or BDO

1,4-Butanediol is a chemical cleaning solvent used for industrial purposes and a precursor of GHB. Companies now post the "official" shelf life as "2 years", but a 1997 publication by BASF said GBL ...
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Were gold(II) complexes synthesized for the first time in 2017?

Recently in the Google news feed, I discovered this news: Gold stabilized in very rare oxidation state +II Missing golden link found: Divalent gold complex isolated for the first time in a ...
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1answer
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Reactions in the presence of sunlight

Some reactions in my textbook specify the need for the presence of sunlight, eg-photolytic decomposition of silver bromide and substitution reaction of methane with chlorine. What is going on in ...
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1answer
288 views

Dissociation constant of solid ammonium chloride [closed]

When solid ammonium chloride dissociates at a certain temperature in a $\pu{0.500 dm3}$ container, ammonia and hydrogen chloride are formed. $$\ce{NH4Cl <=> NH3 + HCl}$$ The initial ...
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3answers
775 views

Can you decay to half an atom?

In school we are learning about half-life, and I was wondering if it is possible to decay to half an atom?
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1answer
367 views

Decomposition of AsH3

In German problems olympiad 2014, the solution says that decomposition of arsine is not a redox reaction. Why would that be? Shouldn't H turn from -1 to 0 and As from 3+ to 0? $$\ce{2AsH3 -> 2As + ...
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1answer
284 views

Radioactivity of materials [closed]

Suppose that a raidoactive brick of an unknown element with a half-life of one year (dangerous stuff!) is left on a regular desk for a day. After the day has passed, the brick is removed. Does the ...
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0answers
107 views

Decomposition speed of ozone [closed]

Elementary reactions of decomposition of ozone with chlorine are as follows (substance with $^*$ is reaction intermediate): \begin{align} \ce{Cl2 + O3 &-> ClO^* + ClO2^*}\tag{1}\\ \ce{ClO2^* +...
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494 views

Rate order of decomposition of hydrogen peroxide

I have been having some troubles finding a source for my investigation. I am inverstigating the decomposition of hydrogen peroxide, which (according to my teacher/supervisor) is a second order ...
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2answers
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Thermal decomposition of magnesium bicarbonate

I was trying to solve a problem from a regional contest where it was a mixture of bicarbonates of $\ce{Na}$ and $\ce{Mg}$ which was put at high temperature. What are the reactions of decomposition? I'...
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1answer
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What reaction happens when carboxylic acids are treated with calcium hydroxide and distilled? [closed]

What reaction takes place when $\ce{Ca(OH)2}$ reacts with $\ce{R-COOH}$? What is obtained after distillation?
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2answers
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Why does calcium carbonate decompose in sulphuric acid?

Here's the reaction: $\ce{H2SO4(aq) + CaCO3(s) -> CaSO4(s) + H2O(l) + CO2(g)}$ I don't understand why calcium carbonate decomposes in sulphuric acid. It's not soluble in water. I could ...
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Why doesn't CaO decompose into Ca and O2?

Many metal oxides decompose into the free metal and oxygen gas at high temperatures, but why doesn't $\ce{CaO}$ do that? What happens to $\ce{CaO}$ at high temperatures? This is from problem 2 of the ...
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1answer
368 views

Sulfur from pyrite roasting process

I'm solving a quantitative problem involving the process of making oleum from pyrite. The problem specifies that, at the end of the reaction, we find sulfur which does not come from the impurities ...
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2answers
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What type of reaction is the reaction between an acid and a carbonate?

Consider the following reaction: $$\ce{2HCl + Na2CO3 -> 2NaCl + H2O + CO2}$$ Is this a double displacement reaction or a decomposition reaction?
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Reaction intermediates of MnO2 catalyzed H2O2 decomposition reaction

Manganese dioxide catalyzes the decomposition of hydrogen peroxide to water and oxygen gas. But what are the intermediates in this catalyzed reaction?
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How can carbon dioxide be converted into carbon and oxygen?

How can $\ce{CO2}$ be converted into carbon and oxygen? $$\ce{CO2 -> C + O2}$$ Alternatively: $$\ce{CO2 + ? -> C + O2}$$ I'm aware that plants are capable of transforming $\ce{CO2 + H2O}$ to ...