Hey, guys, I need really need some help and I would appreciate your help thank you.

Question

21-25 Which of these equations are redox reactions?

21. _____ C4H8(g) + _____ O2(g) → _____ CO2(g) + _____ H2O(g)

22. _____ C4H10(g) + _____ O2(g) → _____ CO2(g) + _____ H2O(g)

23. _____ KMnO4(s) → _____ K2MnO4(s) + _____ MnO2(s) +_____O2(g)

24. ____ AgNO3(aq) + ____ Zn(s) → ____ Zn(NO3)2(aq) + ____ Ag(s)

25. ____ Na3PO4(aq) + ____ AlCl3(aq) → ____ AlPO4(s) + ____ NaCl(aq)

Answer 1

All but 25 are redox equations. What is it you don't understand about this. If the oxidation state changes for ANY ONE reactant/product then you have a redox equation.
C4H8(g) + _____ O2(g) → _____ CO2(g) + _____ H2O(g)
I see at first glane that I have O2 on the left, all by itself, but I quickly see on the right that it is a compound. So I know that is a redox. Technically, O changes from zero oxidation state to 2- on the right. (both CO2 and H2O)

22. _____ C4H10(g) + _____ O2(g) → _____ CO2(g) + _____ H2O(g)
Same thing here.

23. _____ KMnO4(s) → _____ K2MnO4(s) + _____ MnO2(s) +_____O2(g)
I see O in KMnO4 on the left but O2 on the right. Same as the above but reversed. I also see MnO4 on the left but MnO2 on the right so I know something changed
24. ____ AgNO3(aq) + ____ Zn(s) → ____ Zn(NO3)2(aq) + ____ Ag(s)
I see Ag on the left in a compound but on the right a metal. Also I see Zn metal on the left but compound on the right. Must be redox.

25. ____ Na3PO4(aq) + ____ AlCl3(aq) → ____ AlPO4(s) + ____ NaCl(aq)
Na, PO4, Al, Cl all stay the same on left and right so not redox.
Also not that you can do it the laborious way and determine the oxidation state of EACH element in an equation and see if anything changed.