Question

question 4
2 naclo₃ --> 2 nacl + 3 o₂
decomposition reaction
synthesis reaction
double replacement reaction
combustion reaction
single replacement reaction
question 5
2 pts
ca(c₂h₃o₂)₂ + na₂co₃ --> caco₃ + 2 nac₂h₃o₂
synthesis reaction
combustion reaction
single replacement reaction
double replacement reaction
decomposition reaction
question 6
2 pts
cu(oh)₂ + 2 hc₂h₃o₂ --> cu(c₂h₃o₂)₂ + 2 h₂o
double replacement reaction
synthesis reaction
single replacement reaction
combustion reaction
decomposition reaction

Explanation:

Question 4

A decomposition reaction is when a single compound breaks down into two or more simpler substances. The reaction \( 2\text{NaClO}_3
ightarrow 2\text{NaCl} + 3\text{O}_2 \) shows one compound (\(\text{NaClO}_3\)) breaking into two simpler substances (\(\text{NaCl}\) and \(\text{O}_2\)), so it's a decomposition reaction. Synthesis reactions combine substances, replacement reactions involve element substitution, and combustion involves fuel and oxygen (not here).

A double replacement reaction occurs when the positive and negative ions of two ionic compounds exchange places. In \( \text{Ca}(\text{C}_2\text{H}_3\text{O}_2)_2 + \text{Na}_2\text{CO}_3
ightarrow \text{CaCO}_3 + 2\text{NaC}_2\text{H}_3\text{O}_2 \), \( \text{Ca}^{2+} \) and \( \text{Na}^+ \) (cations) exchange with \( \text{CO}_3^{2-} \) and \( \text{C}_2\text{H}_3\text{O}_2^- \) (anions), fitting double replacement. Synthesis builds a compound, combustion needs fuel/oxygen, single replacement has one element replacing another, decomposition breaks down one compound (not here).

A double replacement reaction (specifically an acid - base neutralization, a type of double replacement) occurs here. \( \text{Cu(OH)}_2 \) (a base) and \( \text{HC}_2\text{H}_3\text{O}_2 \) (an acid) react. The \( \text{Cu}^{2+} \) from the base and \( \text{H}^+ \) from the acid, along with \( \text{OH}^- \) and \( \text{C}_2\text{H}_3\text{O}_2^- \) exchange. The products are \( \text{Cu(C}_2\text{H}_3\text{O}_2\text{)}_2 \) (a salt) and \( \text{H}_2\text{O} \) (water), which is characteristic of double replacement (ions swap). Synthesis combines, single replacement has element substitution, combustion needs fuel/oxygen, decomposition breaks one compound (not here).

Answer:

A. Decomposition reaction

Question 5