posted by Alexandra .
Which of the following is a single replacement?
a. KOH + HCl --> KCl + H2O
b. 2Na + 2H2O --> H2 + 2NaOH
c. 2C2H6 + 7O2 --> 4CO2 + 6H2O
d. H2O + CO2 --> H2CO3
Any help would be appreciated, thank you in advance!
a. K goes with Cl and H goes with OH so this is a double replacement.
b. Na is a single item, it replaces ther H of H2O so this is a single replacement.
c. This is a combustion reaction
d. When two somethings combine to make one something that is a combination or synthesis reaction.
it should be "b"