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REDOX question

markosheehan

Member
Jun 6, 2016
136
can some one show me by looking at electrons lost and gained which is oxidised and reduced in the reaction

2ca+o2->2cao

i would of said each calcium atom has a O.N of +2 and o2 has a O.N of 0
the o in 2cao has a O.N of -2 so that means the ca has a O.N of +2. but that makes no sense. where did as where did the oxygen gain the 2 electrons if the O.N of ca stays the same

im doing these questions wrong
 

Klaas van Aarsen

MHB Seeker
Staff member
Mar 5, 2012
9,491
can some one show me by looking at electrons lost and gained which is oxidised and reduced in the reaction

2ca+o2->2cao

i would of said each calcium atom has a O.N of +2 and o2 has a O.N of 0
the o in 2cao has a O.N of -2 so that means the ca has a O.N of +2. but that makes no sense. where did as where did the oxygen gain the 2 electrons if the O.N of ca stays the same

im doing these questions wrong
Both $\ce{Ca}$ and $\ce{O2}$ are neutral.
In $\ce{CaO}$, $\ce{Ca}$ has oxidation number +2 and $\ce{O}$ has oxidation number -2.
$\ce{Ca}$ is oxidized and $\ce{O}$ is reduced.
 

MarkFL

Administrator
Staff member
Feb 24, 2012
13,775
can some one show me by looking at electrons lost and gained which is oxidised and reduced in the reaction

2ca+o2->2cao
We have MathJax configured to handled chemical equations...for example the following code:

\ce{2Ca + O2 -> 2CaO}

produces:

\(\displaystyle \ce{2Ca + O2 -> 2CaO}\)

Here's more information:

Chemistry notation using mhchem
 

markosheehan

Member
Jun 6, 2016
136
Both $\ce{Ca}$ and $\ce{O2}$ are neutral.
In $\ce{CaO}$, $\ce{Ca}$ has oxidation number +2 and $\ce{O}$ has oxidation number -2.
$\ce{Ca}$ is oxidized and $\ce{O}$ is reduced.
thanks i get it now