Which reaction is NOT a redox reaction?
CH4+2O2=CO2+2H2O
2Na+CI2=2NaCI
AgNO3+NaCI=AgCI+NaNO3
KCIO3=KCI+3/2O2
I chose, KCIO3=KCI+3/2O2. Is this correct?
6 answers
Yes
absolutely not correct because:.
KClO3 ==> KCl + 3/2 O2
Cl on the left is +5 oxidation state and on the right it is -1 while
O on the leftr is -2 and on the right is zero. Loss and gains of electrons certainly is redox.
KClO3 ==> KCl + 3/2 O2
Cl on the left is +5 oxidation state and on the right it is -1 while
O on the leftr is -2 and on the right is zero. Loss and gains of electrons certainly is redox.
I second guessed myself. The original answer I had was CH4+2O2=CO2+2H2O. Is this correct Dr. Bob?
C'mon. The only way to do this problem is not to guess.
You go through and assign oxidation states to each element and the ones that don't change are not redox; those that do change are redox. For your second guess here are the numbers.
On the left C is -4, H is +1, O is zero.
On the right C is +4, H is +1, O is -2
So C and O changed. Must be redox. In chemistry one NEVER has to guess. You can figure all these things out one by one. I can give you a link if you don't know how to assign oxidation states.
You go through and assign oxidation states to each element and the ones that don't change are not redox; those that do change are redox. For your second guess here are the numbers.
On the left C is -4, H is +1, O is zero.
On the right C is +4, H is +1, O is -2
So C and O changed. Must be redox. In chemistry one NEVER has to guess. You can figure all these things out one by one. I can give you a link if you don't know how to assign oxidation states.
Okay. I've done what you said and found that the oxidation numbers for AgNO3 + NaCI = AgCI + NaNO3 do not change. This must not be redox.
You are right. That is the only one listed that is NOT redox and that's what the problem wanted: i.e., the equation that was not redox.
1 answer