Chemical reactions

  • Thread starter intenzxboi
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  • #1
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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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  • #2
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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??
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.
 
  • #4
Borek
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Those are not chemical equations.
They were not inteded to be 'equations'.

AlBr3 & K2O2 are though.
No - these are 'formulas'.
 

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