Question

question 13
2 pts
p₄ + 5 o₂ --> 2 p₂o₅
combustion reaction
double replacement reaction
single replacement reaction
synthesis reaction
decomposition reaction
question 14
2 pts
2 c₆h₁₄ + 19 o₂ --> 12 co₂ + 14 h₂o
decomposition reaction
single replacement reaction
synthesis reaction
combustion reaction
double replacement reaction
question 15
2 pts
baco₃ --> bao + co₂
combustion reaction
double replacement reaction
decomposition reaction
single replacement reaction
synthesis reaction

Explanation:

Question 13

The reaction is \( \text{P}_4 + 5\text{O}_2
ightarrow 2\text{P}_2\text{O}_5 \). A synthesis reaction combines reactants into a single product. Here, \( \text{P}_4 \) and \( \text{O}_2 \) combine to form \( \text{P}_2\text{O}_5 \). It is also a combustion (since \( \text{P}_4 \) burns in \( \text{O}_2 \)), but synthesis is more direct here (two reactants form one product).

The reaction is \( 2\text{C}_6\text{H}_{14}+19\text{O}_2
ightarrow12\text{CO}_2 + 14\text{H}_2\text{O} \). A combustion reaction involves a hydrocarbon (or organic compound) reacting with oxygen to produce \( \text{CO}_2 \) and \( \text{H}_2\text{O} \). \( \text{C}_6\text{H}_{14} \) (a hydrocarbon) reacts with \( \text{O}_2 \) to form \( \text{CO}_2 \) and \( \text{H}_2\text{O} \), so this is a combustion reaction.

The reaction is \( \text{BaCO}_3
ightarrow\text{BaO}+\text{CO}_2 \). A decomposition reaction breaks a single compound into two or more products. Here, \( \text{BaCO}_3 \) (one compound) decomposes into \( \text{BaO} \) and \( \text{CO}_2 \) (two products), so it's a decomposition reaction.

Answer:

D. Synthesis reaction (and also A. Combustion reaction, but synthesis is the core type here as it's combining substances; if considering combustion as a subset of synthesis for burning, but strictly, synthesis is \( A + B
ightarrow AB \), which this is. However, combustion is also correct. But typically, for \( \text{P}_4 + \text{O}_2
ightarrow \text{P}_2\text{O}_5 \), synthesis is the primary type (and combustion is a specific synthesis with oxygen). So the best fit here is Synthesis reaction (option D) or Combustion (option A). But let's recheck: Synthesis is combining two or more substances into one. Combustion is a reaction with oxygen, usually producing heat/light. This reaction is both, but the options include both. However, the reaction \( A + B
ightarrow AB \) is synthesis. So the answer is D. Synthesis reaction (or A. Combustion reaction; but let's confirm: the reaction of a non - metal with oxygen to form an oxide is a synthesis reaction, and also a combustion reaction. But in the context of reaction types, synthesis is \( A + B
ightarrow AB \), which this is. So the answer is D. Synthesis reaction (and A. Combustion reaction is also correct, but maybe the question expects synthesis as the main type here).

Question 14