Balancing Equations: Oxygen in Compounds

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Discussion Overview

The discussion revolves around the balancing of chemical equations, specifically focusing on the behavior of oxygen in compounds versus its diatomic nature in molecular form. Participants explore whether oxygen must always exist in pairs when part of a compound or if it can appear in uneven quantities.

Discussion Character

  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant questions if oxygen in compounds must exist in pairs, citing examples like Fe2O3.
  • Another participant clarifies that oxygen does not need to be in pairs when in compounds, providing examples such as CaO and CO2.
  • A participant raises a concern about the representation of water (H2O) and whether it should always be written as 2H2O.
  • There is a discussion about diatomic molecules being covalently bonded only in their natural state, with some participants suggesting that this statement may be too strong.
  • One participant emphasizes the importance of asking questions in class for better understanding.

Areas of Agreement / Disagreement

Participants express differing views on the nature of diatomic molecules and their behavior in compounds. There is no clear consensus on the implications of diatomicity in the context of balancing equations.

Contextual Notes

Some statements made by participants contain assumptions about the nature of diatomic molecules and their bonding, which may not be universally applicable. The discussion also reflects varying levels of understanding and teaching effectiveness regarding chemical concepts.

Who May Find This Useful

This discussion may be useful for students learning about chemical bonding and the balancing of equations, as well as educators seeking to understand common misconceptions in chemistry education.

J-Girl
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hi there,:) I am just wondering, when balancing equations, because oxygen is a diatomic molecule, when it is in a compound, can it exist in threes of fives? for example, Fe2O3, or does it have to be 2Fe203. Or is it just when it is a single molecule of oxygen(and not in a compound) that it must be in atoms of two? So my question is, when oxygen in is a compound, does it have to exist in atoms of twos, or can it be uneven? sorry this may be a stupid question but its not clear in my textbook! ! thanksssss:D
 
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It is diatomic only when in the form of oxygen molecules. Same can be said about all other diatomic gases. When in compounds, they don't have to be in pairs - so CaO contains one oxygen atom, CO2 two, Fe2O3 three, OsO4 four and so on.

Note that gaseous oxygen - while in most cases diatomic - has also a triatomic form, called ozone. You will not see it often in reactions when starting to learn chemistry, but it is quite an important compound.
 
but what about H20, isn't it always written as 2H20? or just H20?
 
H2O - single water molecule - is perfectly correct.

NaOH + HCl -> NaCl + H2O
 
Didn't your chemistry teacher explain this?
 
shes wasnt very direct. so diatomic atoms are only covalently bonded when they exist naturally, before they enter into chemical reactions? this was the one thing that wasnt clear to me in chem class
 
J-Girl said:
so diatomic atoms are only covalently bonded when they exist naturally, before they enter into chemical reactions?

Diatomic molecules. It can be put that way, although atoms of the same element can be also covalently bonded in the compound. They don't have to, but it happens, so your statement (especially "only") is way too strong.

Some gases in free, elemental form, are present as diatomic molecules.
 
ohh haha sorry i did mean diatomic molecules:)my bad.
 
If you don't understand something raise your hand and ask the teacher. Don't be shy. And keep asking until the teacher explains it to your satisfaction. That's their job.

In high school my chemistry teacher knew less chemistry than I did and I had to correct him a few times.
 

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