Chemical Reactions: Why we Use Symbols with Numbers

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Discussion Overview

The discussion revolves around the notation used in chemical reactions, specifically why certain elements are represented with specific subscripts, such as Al + Br2 and K + O2. Participants explore the rules governing these representations and the distinction between chemical equations and formulas.

Discussion Character

  • Conceptual clarification, Debate/contested

Main Points Raised

  • One participant questions the notation used in chemical reactions, asking why aluminum is written as Al + Br2 instead of Al2 and why potassium is not represented as K2.
  • Another participant asserts that the initial representations are not chemical equations but rather formulas, suggesting that AlBr3 and K2O2 are the correct chemical equations.
  • A third participant provides a link to a resource on diatomic molecules, possibly to clarify the nature of certain elements in their molecular form.
  • There is a reiteration that the initial representations were not intended to be equations, emphasizing the distinction between formulas and equations.

Areas of Agreement / Disagreement

Participants express disagreement regarding the classification of the initial representations as chemical equations, with some asserting they are formulas instead. The discussion remains unresolved regarding the specific rules that dictate the use of subscripts in chemical notation.

Contextual Notes

Participants have not fully explored the underlying principles of chemical bonding and charge balancing that dictate the use of subscripts in chemical formulas. There is also a lack of consensus on the terminology used to describe the representations.

intenzxboi
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I was wondering how come when ever there's a question like aluminum reacts with bromine it is usually written like Al + Br2? or Potassium reacts with oxygen is K + O2?

How do we know when there's 2 of them?? Is there like a special rule? Why isn't there K2 or Al2??
 
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intenzxboi said:
I was wondering how come when ever there's a question like aluminum reacts with bromine it is usually written like Al + Br2? or Potassium reacts with oxygen is K + O2?

How do we know when there's 2 of them?? Is there like a special rule? Why isn't there K2 or Al2??

Those are not chemical equations. AlBr3 & K2O2 are though. Al forms +3 ions so you would need three -1 bromide ions to balance the charge.
 
pr0blumz said:
Those are not chemical equations.

They were not inteded to be 'equations'.

AlBr3 & K2O2 are though.

No - these are 'formulas'.
 

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