Net Ionic Equations: Balancing & Gases/Liquids

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Discussion Overview

The discussion revolves around balancing a chemical equation involving the decomposition of solid ammonium dichromate when heated, as well as the formulation of its net ionic equation. Participants explore the treatment of gases and liquids in net ionic equations, and the behavior of covalent molecules in this context.

Discussion Character

  • Homework-related
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • The original poster expresses difficulty in balancing the equation for the decomposition of ammonium dichromate and questions the correctness of their initial equation.
  • Some participants propose that the decomposition products should include chromium (III) oxide instead of chromium (IV) oxide, suggesting a potential error in the original problem statement.
  • The original poster seeks clarification on how to handle gases and liquids in net ionic equations, questioning whether they ionize or remain unchanged.
  • Another participant asserts that gases and liquids are typically left unchanged in net ionic equations, providing an example involving zinc and hydrogen ions.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the correct products of the decomposition reaction, with conflicting views on whether chromium (III) or chromium (IV) oxide is formed. The treatment of gases and liquids in net ionic equations remains a topic of inquiry without definitive agreement.

Contextual Notes

There is uncertainty regarding the balancing of the chemical equation and the correct identification of decomposition products. The discussion also highlights the lack of clarity on how to approach covalent molecules in the context of net ionic equations.

Who May Find This Useful

Students and individuals interested in chemistry, particularly those studying chemical equations, net ionic equations, and the behavior of different states of matter in chemical reactions.

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Homework Statement



solid ammonium dichromate will produce (when heated) solid chromium (IV) oxide, nitrogen gas, and water vapor. Write the balance equation and net ionic equation.


Homework Equations



First i wrote:

(NH4)2Cr207 (s) --> CrO2 (s) + N2 (g) + H2O (g)

The Attempt at a Solution



first i just cannot balance this thing. I am usually very good at it but this one doesn't seem to work. do i have it written down correctly so far?

secondly, in net ionic equations, what do you do with gases (and liquids)? i know solids do not ionize so you do not change them. but in this case, are there ANY ions? how can i write a net ionic equation here?

also if the molecule is molecular (covalent) does it ionize at all or do you also just leave it? can it "dissolve" in solution (eg CO2)? i would assume you do not change it since it is made up of covalent bonds and not ionic ones. hence it written the same in the net ionic equations.

thanks for the help.
 
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Don't worry - you can't balance the equation because there's a mistake in the problem. Ammonium dichromate, when heated, decomposes into chromium (III) oxide, nitrogen gas, and water vapor. The green color left behind is indicative of chromium (III) oxide. That should make things easier for you.
 
thanks.

does anyone know the other questions? what do you do with gases and liquids for net ionic equations? what about covalent molecules?
 
Just left them if necessary.

2H+ + Zn(s) -> H2(g) + Zn2+

Borek
 
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