I’m not sure if this is a double displacement or composition ? Help

Question

C₃H₈ (g) + 5 O₂(g) = 3 CO₂(g) + 4 H_2O(

I’m not sure if this is a double displacement or composition ? Help

Answer 1

Combustion reactions will always have O2 as a reactant, a hydrocarbon as a reactant (a substance with both H and C), CO2 and/or CO as a product, and H2O as a product.

Synthesis/combination reactions: will always have one product (one substance to the right of the arrow)

Decomposition: will always have one reactant (one substance to the left of the arrow)

Single replacement/displacement: will always have one lone element and one compound for both reactants and products

(EX: 3Na + Fe(NO3)3 ---> Fe + 3NaNO3

LE Compound --> LE + Compound)

Double replacement/displacement: will always have two compounds and the metals (or non-metals) will switch places.

EX: Pb(NO3)2 + 2NaOH ---> Pb(OH)2 + 2NaNO3

Notice how the "Pb" and the "Na" seem to switch places.

A special type of double displacement/replacement is a neutralization reaction. A neutralization reaction is where you have an acid + base ----> salt + H2O.

Acids typically begin with H (not always, but usually).

Bases typically contain OH (not always, but usually).

The H from the acid + the OH from the base combine to make the H2O.

**Combustion reactions will always have C_xH_y + O2 ---> CO2 + H2O** So the key to recognizing combustion reactions is knowing that they will always have O2 as a reactant**

Answer: The reaction that you provided is a combustion reaction.