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why is this a single replacement reaction

 
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Dec2-12, 10:27 PM   #1
 

why is this a single replacement reaction


the equation from my textbook: 2k+2H2O yields 2KOH+H2 why? I thought that such reactions are when one element swaps with another but in this case, there is an extra H2
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Dec3-12, 12:40 AM   #2
 
Quote by ilovephysics0 View Post
such reactions are when one element or ion swaps with another
Fixed.
Dec3-12, 03:03 AM   #3
 
Admin
Look at water molecule - what is swapped with what?
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