Question

In two or more complete sentences explain how to balance the chemical equation and classify its reaction type.
___P4 + ___O2 ⟶ ___P2O3

Answer 1

start with the most "complex" molecule, in this casae, P2O3

notice how you have 2 mol P atoms on the right and 4 on the left, so you can double the coefficient of P2O3 to get

___P4 + ___ O2 --> 2P2O3

follow the same line of reasoning to balance the oxygen atoms

Answer 2

for reaction type, try to compare your reaction to this chart