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Questions tagged [decomposition]

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

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I was told that Lithium and group 2 bicarbonates does not decompose on heating.Group 1 bicarbonates does decompose except lithium

But in some sources it was explained that stability of group 1 bicarbonates increases down the group.If it is true then how does lithium bicarbonate does not decompose ?.Can anyone please tell me ...
B. RITHISH's user avatar
-1 votes
0 answers
43 views

What compounds break down into Nitrogen and an inert compound? [duplicate]

I’ve been looking to create a method of chemically producing an artificial atmospheric air blend for situations where the air quality is poor or dangerous, and the obvious answer for producing oxygen ...
Tanner Nelson's user avatar
6 votes
0 answers
158 views

How predictable are the decomposition temperatures of trithiocarbonates?

How do the following parameters: Ionic radius of a cation. Oxidation number of a cation. Noble metal cation vs alkali metal cation. Something else that I may not know about. affect the decomposition ...
Paul Kolk's user avatar
  • 565
3 votes
0 answers
31 views

Thermostability of Metal Carbonates and Nitrates

While studying in high school, I came across the following thermal decomposition reactions: $$\ce{Li2CO3 -> Li2O + CO2 }$$ $$\ce{MgCO3 -> MgO + CO2}$$ $$\ce{PbCO3 -> PbO + CO2}$$ $$\ce{Ag2CO3 ...
Arnav Ranka's user avatar
-3 votes
1 answer
55 views

How long does it take for calcium carbonate to calcium oxide if constant heat of 850 degree Celsius is given?

I am using a muffle furnace and the temperature is set for 850 degree Celsius . I have placed 100g of Calcium carbonate ( in the form of seas shells) in the furnace . How long will it take to ...
Dhyan Surendranath's user avatar
4 votes
1 answer
323 views

What is the reason of producing *spark* in the volcanic reaction (decomposition of ammonium dichromate)?

In a scientific demonstration of volcanic eruption(decomposition of ammonium dichromate), the green chromium(III) oxide produces an orange spark to mimic the eruption of lava from a volcano. I would ...
Freeby Freeby's user avatar
-3 votes
1 answer
282 views

What is the temperature at which sodium hydroxide decomposes at? And how would you collect the condensation? [closed]

I don't think this is an extremely tough question, but I can't really find that much information online on this reaction. I found a video about the decomposition of calcium hydroxide, though I'm not ...
E.X.'s user avatar
  • 7
0 votes
1 answer
88 views

Would the partial pressure of O2 in the system affect the rate of the decomposition of H2O2?

In my Bio 1 lab we studied the way catalase catalyzes the decomposition of H2O2 and at the end it asked me what conditions would affect the rate of the reaction. It was the type of question that ...
DiMaBean's user avatar
2 votes
1 answer
160 views

Can anhydrous magnesium sulfate decompose at temperatures lower than the expected temperature of 1,124°C; is this what happened?

Context I am trying to synthesize and isolate boric acid from borax. I know that boric acid is less soluble in water than the NaCl that will be in the solution so it will precipitate out more readily, ...
Peter Williams's user avatar
-2 votes
2 answers
354 views

Why does sodium hydrogen carbonate decompose into sodium carbonate, water vapour, and carbon dioxide?

Why is the reaction for sodium hydrogen carbonate: $$\ce{2 NaHCO3(s) -> Na2CO3(s) + H2O(g) + CO2(g)}$$ but not: $$\ce{4 NaHCO3(s) -> 4 Na + 2 H2O(g) + 4 CO(g) + 3 O2(g)}$$ or: $$\ce{2 NaHCO3(s) -...
Emm's user avatar
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-1 votes
1 answer
239 views

Decomposition of ammonium nitrate

Consider the decomposition of $\ce{NH4NO3 -> N2O +2 H2O}$ How do I show this is a redox reaction. Within the $\ce{H2O}$ the oxidation state of $\ce{O}$ is $-2$ and the oxidation state of $\ce{H}$ ...
Stark's user avatar
  • 95
5 votes
2 answers
909 views

Do (some or all) phosphates thermally decompose?

I know that metal carbonates decompose to a metal oxide and carbon dioxide upon heating and I was curious if phosphates (eg K3PO4) displayed similar behaviour? Or are they like sulphates where some ...
Tom P's user avatar
  • 391
-1 votes
1 answer
630 views

Sodium bicarbonate to sodium carbonate decomposition

Recently I ran the reaction: $$\ce{2NaHCO3 ->[400°C] Na2CO3 + H2O + CO2}$$ I wanted an explanation why the sodium bicarbonate ($\ce{NaHCO3}$) decomposed into sodium carbonate ($\ce{Na2CO3}$), water ...
Matteo Zervos's user avatar
-1 votes
1 answer
45 views

Is there any amateur way to process fabric into cellulose?

This article interests me. It says they can decompose fabric into more pure materials - cellulose, then splitting that polymer/polysaccharide into glucose - by soaking it in sulfuric acid. I read that ...
Julius Hamilton's user avatar
-1 votes
2 answers
67 views

Electrolysis of Solutions

So far I've only encountered formulas to solve for solutions of single molecules while learning about electrolysis, i.e. H2O or FeCl3. This generally has involved determining the resultants, ...
Curious About Chemistry's user avatar
3 votes
0 answers
103 views

Equilibrium concentrations of CO and Cl2 by dissociation of phosgene

I am working through a problem set from MIT's open courseware course Principles of Chemical Science. The question is: Phosgene $\ce{(COCl2)}$ is a chemical warfare agent that decomposes by the ...
AlRi's user avatar
  • 39
-1 votes
1 answer
140 views

What is the decomposition of potassium nitrite?

I can find plenty of information on the decomposition of potassium nitrate into potassium nitrite and free oxygen, but apparently the resulting potassium nitrite likes to further decompose and produce ...
Wilma McAfee's user avatar
2 votes
1 answer
333 views

Do dessicants work inside of a freezer?

I learned that water sublimates when frozen, which prompts me to ask: Do dessicants work inside a freezer? While dessication inside of a freezer is unlikely to remove large quantities of water fast, ...
Hans's user avatar
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5 votes
1 answer
105 views

Is there any transparent see material that can endure temperatures of 2000 °C?

I was wondering if there is a transparent material that can endure temperatures up to 2000 °C without deforming or degrading. This material doesn't have to be glass, it can be plastic or a weirdly ...
Sayan Chowdhury's user avatar
2 votes
1 answer
56 views

Rate law for thermolysis at temperatures well above the decomposition temperature

If the temperature is higher than the decomposition temperature, are thermal decomposition reactions reversible? For example, which of the following schemes would be more appropriate for temperatures ...
user898724's user avatar
2 votes
3 answers
290 views

Under what conditions does manganese dioxide lose its catalytic property?

We know that under standard conditions (room temperature and 760 mmHg air pressure) we have this reaction: $$\ce{2H2O2(l) ->[MnO2] 2H2O(l) + O2(g)}$$ Here, manganese dioxide is behaving as a ...
user avatar
1 vote
0 answers
31 views

Do mechanically recycled plastics decompose more rapidly?

Does it mean that mechanically recycled plastics decompose more rapidly in the environment? So even if mechanical recycling doesn't prevent plastics from going to landfills, just puts it off (...
Sergey Zolotarev's user avatar
-4 votes
1 answer
109 views

What is the chemical equation of the decomposition of natural cork? [closed]

I am currently doing a study project on natural cork wine stoppers and I am investigating the emissions of composting natural cork (C123H182O56N). However, I am struggling with setting up the chemical ...
George's user avatar
  • 3
3 votes
1 answer
203 views

Does this coupled reaction actually happen (decomposition of calcium carbonate)

I found the following example of a coupled reaction to drive the decomposition of calcium carbonate. I get the calculation part of it, that the changes in Gibbs energy sum to a negative amount. But ...
user796099's user avatar
3 votes
1 answer
438 views

Is a diluted aqueous solution of sodium hypochlorite more stable than a concentrated solution, all else being equal?

On the Clorox website, they recommend that you dilute bleach (NaOCl) in water prior to use for disinfection. They say that you should make a fresh solution each time you need to use it, adding: “Don’t ...
zunojeef's user avatar
  • 159
1 vote
0 answers
79 views

Hazards of eating non-stick coating, particularly considering the coating primer [closed]

How unhealthy are teflon / non-stick coating chips that end up eaten? What role does the primer coating play? Existing similar threads that don't go into enough detail: 1, 2 I understand that there is ...
Zubo's user avatar
  • 1,220
0 votes
0 answers
111 views

Rate of Decomposition of Sodium Thiosulphate

I want to calculate the activation energy of the decomposition of sodium thiosulphate, as a part of my school research project. I am aware that I must use the Arrhenius equation where the rate of ...
Sankalp Kapur's user avatar
2 votes
0 answers
59 views

Why is it that not all metals produce hydroxides when reacting with water? [duplicate]

I was taught, as a rule, that: metals + water $\rightarrow$ metal hydroxide + hydrogen gas $$\text{Na} + \text{H}_2\text{O} \rightarrow \text{NaOH} + \text{H}_2$$ However: $$3\text{Fe} + 4\text{H}...
Robinson's user avatar
0 votes
1 answer
227 views

How is this reaction not a decomposition reaction? And are all disproportionation reactions decomposition reactions?

When I asked my teacher whether all disproportionation reactions are decomposition reactions, he stated the following reaction: $$ \ce{4 KClO3 -> 3 KClO4 + KCl} $$ and said that this isn't a ...
tofuthefirst's user avatar
1 vote
0 answers
67 views

What catalysts can be used to decompose nitrous oxide?

Constraints: I'm going to need to use a lot of this stuff in various locations, so I'd prefer it not be expensive (leaving out things like platinum, palladium, and rhodium.) While I don't believe I ...
JDKelley's user avatar
  • 119
2 votes
1 answer
649 views

Do all metal nitrates give nitrogen dioxide on decomposition?

Some metal nitrates decompose to give nitrites: $\ce{2MNO3 -> 2MNO2 + O2}$ whereas some metal nitrates decompose to give $\ce{NO2}$. A possible reaction is $\ce{M(NO3)2 -> MO + NO2 + O2}$ Based ...
Ashish's user avatar
  • 1,409
4 votes
0 answers
72 views

Decomposition of Hydrogen Peroxide Catalysed by Potassium Iodide in Basic Solution

As part of my high school project, I had to measure the initial rate of decomposition of hydrogen peroxide catalysed by potassium iodide at different pHs. At higher pHs (alkaline conditions), I found ...
CC792's user avatar
  • 41
3 votes
1 answer
150 views

Symbolic form of equilibrium constant for ammonium carbamate dissociation

$$\ce{NH2COONH4(s) <=> 2 NH3(g) + CO2(g)} \qquad K = \left(\frac{p(\ce{NH3})}{p^\circ}\right)^2\times\frac{p(\ce{CO2})}{p^\circ}$$ Assuming that you start this experiment with pure solid $\ce{...
user avatar
0 votes
0 answers
324 views

treating PLA (Polylactic acid) plastic to make it biodegradable

I am using PLA for 3D printing, and I know it does not degrade well in the wild. I would like to know if there is a chemical process I could use to treat it at home. Specifically, I am looking for a ...
JCSB's user avatar
  • 101
0 votes
2 answers
1k views

Using the mass of calcium carbonate, what volume of carbon dioxide could theoretically be obtained if the reaction progressed to completion?

Using the mass of calcium carbonate $m(\ce{CaCO3}) = \pu{0.500 g}$, what volume of carbon dioxide $V(\ce{CO2})$ (in $\pu{mL})$ could theoretically be obtained if the reaction progressed to completion? ...
lizzy's user avatar
  • 9
-1 votes
1 answer
391 views

How would one determine the temperature needed such that hydrogen peroxide will start to decompose? [closed]

Hydrogen peroxide decomposes at room temperature and so I was wondering what temperature is sufficient for this decomposition to occur. Can someone explain how we can determine this? (theoretically or ...
Alexander Ivanov-Bleck's user avatar
1 vote
0 answers
43 views

Strange Distillation Behavior

I was attempting a fractional distillation with 1mL water and 1mL propylene glycol, and I’ve been encountering strange behavior with the heating of the mixture. The heating curve shows strange “spikes”...
COsborne's user avatar
  • 102
1 vote
3 answers
3k views

How to neutralize the stink of decomposed fish?

Recently I discovered for myself an interesting way to easily produce home made plant fertilizer that is quite effective (tested myself on the plants). It's fish emulsion (so can be used also in a ...
user1876484's user avatar
1 vote
0 answers
51 views

Software for modelling decomposition reactions

What are some good softwares that can model a decomposition reactions? I have a reaction of H2O2 decomposing on metal exchange hexaaluminate catalyst. The catalyst is present in a packed bed thruster. ...
user86428's user avatar
1 vote
0 answers
207 views

What are the most potent hydrogen peroxide decomposition catalysts available to an amateur? [closed]

Some months ago I was playing with $60\,\%$ $\ce{H2O2}$ and unknowingly I used a silver spoon to transfer the liquid from a container, and the peroxide immediately started bubbling (it did look and ...
Francis L.'s user avatar
  • 1,480
1 vote
0 answers
150 views

How can I analytically calculate the rate of thermal decomposition of calcium carbonate?

I am a first-time poster on Chemistry StackExchange, and not much of a chemist. I'm trying to determine the rate of thermal decomposition (in mol/s) of calcium carbonate ($\ce{CaCO3}$) at various ...
Chris Forsyth's user avatar
-1 votes
1 answer
46 views

Basic Chemistry: Carbon Dioxide Formation Unsure about Reaction [closed]

I have the following question description: Consider a gas composed of $\ce{CO_2}$, $\ce{CO}$, $\ce{O_2}$ and $\ce{O}$ with 1 $\ce{C}$ nuclei for every 2 $\ce{O}$ nuclei. I am trying to write ...
Articat's user avatar
0 votes
1 answer
1k views

Risks from overheated phenolphthalein in green/orange silica gel drying

Recently I tried to dry out some indicating silica gel. When I googled, I found advice on line saying that it should be heated to 150 C and that such was a standard procedure, so I popped it into the ...
Gus's user avatar
  • 103
0 votes
1 answer
4k views

Half-life and shelf-life of second-order reaction

For integrated rate laws, I have attempted to find the shelf-life and half-life of second-order reaction: However, the answers I have obtained (which are labelled with a red cross) are very different ...
Bohan's user avatar
  • 51
0 votes
1 answer
5k views

Can Aluminum Hydroxide (Al(OH)3) be heated to it's melting temperature before decomposing?

On the wikipedia page for aluminum hydroxide the listed melting point is 300 °C (572 °F), but in the same page it states that aluminum hydroxide decomposes at only 180 °C (356 °F). Can aluminum ...
bakingluvr's user avatar
3 votes
2 answers
7k views

Diluting 4 % NaOCl to get a 1 % solution

Assuming that one has a 1 litre bottle of liquid bleach containing $4~\%$ sodium hypochlorite. If I wish to dilute it down to $1~\%$ sodium hypochlorite (to use as disinfectant), would adding 3 litres ...
bdutta74's user avatar
  • 149
2 votes
0 answers
51 views

Long Term Storage of D-Cell Battery

I plan to store D-cell batteries in a winter home. The shelf-life is finite: is there any reason not to freeze or refridgerate the batteries to extend the shelf life?
gatorback's user avatar
  • 121
1 vote
0 answers
22 views

Algae Cultivation Using Polyethylene Film Reactor Vessel Floating In Pool with Algicidal ClO2 Concentration

I'm attempting to grow chlorella algae in a polyethylene film bag (which contains the growth medium) submerged in a temperature-moderating, above-ground swimming pool. This presents a challenge in ...
James Bowery's user avatar
-1 votes
1 answer
2k views

How can we tell if a salt will melt or decompose?

Take $\rm NaCl$ for instance, a salt that will melt when it reaches its melting point, and compare it with $\rm NH_4NO_3$, a salt that doesn't melt, but instead decomposes to $\rm N_2O$ and $\rm H_2O$ ...
timeinbaku's user avatar
3 votes
2 answers
1k views

What does HClO2 aqueous solution decompose to in an open environment? [closed]

I looked up the decompositions of diluted $\ce{HClO2}$ aqueous solution (used in a disinfectant) to know if it is safe to use on some substances, such as metal, wood, leather or skin. However, the ...
THN's user avatar
  • 141