Introduction: How to Dramatically Demonstrate a Decomposition Reaction

This chemical volcano is a result of the decomposition of Ammonium Dichromate.

A decomposition reaction (aka analysis reaction) follows the general formula below

A--> B + C

A compound breaks down into smaller components.

This is the demonstration of the decomposition of Ammonium Dichromate

(NH4)2Cr2O7 ---> N2 + 4H2O + Cr2O3

Cr2O3 -the green solid

Notes

Chromium III and chromium VI, as well at its compounds, including ammonium dichromate, are known carcinogens. Chromium will irritate the mucous membranes. Therefore, take care to perform this demonstration in a well-ventilated area (preferably a ventilation hood) and avoid skin contact or inhalation of the materials. Wear gloves and safety goggles when handling ammonium dichromate.

Comments

author
antienoob (author)2009-07-29

were could i find the materials needed for this. cose i so wont to try this at home.

author
pwest71 (author)2009-06-25

Any way to make a similar effect, but safe for in a home? Looking to make a "faux" volcano/waterfall.....

author
MacLean (author)2009-05-17

so what chemical is first burned? ammonium?

author
duckman1970 (author)2009-05-17

yah it worked whoooo BANG! ahhh ahhhhh ahhhhhhh sick volcano man

author
szechuan53 (author)2009-04-21

very nice I also needed a shovel (I just used a little beach shovel though)

author
hacedor (author)2009-03-26

I needed a shovel!?!

author
The Fallen (author)2008-09-21

this is a decomposition reaction, where is all the energy coming from? breaking bonds requires energy, correct?

author
Holden_vy_s (author)The Fallen2009-02-10

Heat is energy. Did you now watch the clip?

author

Well, he kinda heated it up with a torch.. =/ If that's not energy, then I don't know what is.

author
Arbitror (author)2008-12-18

That is neat!

author
I_am_Canadian (author)2008-07-28

lol looks like a volcano

author
alwinovich (author)I_am_Canadian2008-08-21

nice jou must be the first one to notice that on the whole world! congrats! would you like a cookie?

author
alwinovich (author)alwinovich2008-08-24

lol

author
I_am_Canadian (author)alwinovich2008-08-21

I would love one, thanks.

author
tubajoey1 (author)2008-08-13

where might i get the materials for this? like, somewhere i could go locally, not the internet. thanks!

author
big-jamie (author)2008-07-12

makes a hell of a mess lol but very cool (H)

author
GorillazMiko (author)2008-02-02

Looks awesomely awesome to the most awesomeness of awesome, keep up the great videos!

author
tyeo098 (author)2008-02-02

Ultimate science fair volcano!

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