Question

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Explanation:

Step1: Identify decomposition reaction

A decomposition reaction has one compound breaking into simpler substances.

• $2H_2O_2

ightarrow 2H_2O + O_2$: 1 compound → 2 simpler substances

• $CaO+CO_2

ightarrow CaCO_3$: 2 reactants → 1 product (synthesis)

• $2Mg+O_2

ightarrow 2MgO$: 2 reactants → 1 product (synthesis)

• $2H_2(g) + O_2(g)

ightarrow 2H_2O(g)$: 2 reactants → 1 product (synthesis)

Step2: Match reaction descriptions

• Heat required: thermal decomposition
• Electric current required: electrolysis
• Catalyst required: catalytic decomposition
• Single compound reactant: decomposition

Step3: Complete Fe₂O₃ decomposition

Decomposition of $\text{Fe}_2\text{O}_3$ (heat) produces Fe and $\text{O}_2$:
$\text{Fe}_2\text{O}_3 \xrightarrow{\text{heat}} \text{Fe} + \text{O}_2$

Answer:

1. Decomposition reaction: $\boldsymbol{2H_2O_2

ightarrow 2H_2O + O_2}$

1. Drag-and-drop matches:

• reaction in which heat is required: thermal decomposition
• reaction in which an electric current is required: electrolysis
• reaction that requires a catalyst: catalytic decomposition
• reaction where the reactant is one compound: decomposition

1. Completed decomposition: $\text{Fe}_2\text{O}_3 \xrightarrow{\text{heat}} \boldsymbol{\text{Fe}} + \boldsymbol{\text{O}_2}$ (selected products: Fe, $\text{O}_2$)