Question

name _____________date 02/10/2026per __hw balancing chem equationsw3define:synthesiscombustionsingle replacementdouble replacementdecompositionbalance the following chemical equations and name the type of reaction.example_ $ce{o_{2}}
ightarrow$ ___ $ce{o_{3}}$ = __3__$ce{o_{2}}
ightarrow$ __2__ $ce{o_{3}}$type of reactionsynthesis1. ______ $ce{n_{2}}$ + ______ $ce{h_{2}}$ $
ightarrow$ ______ $ce{nh_{3}}$type of reaction2. ______$ce{au_{2}o_{3}}
ightarrow$ ______$ce{au}$ + ______$ce{o_{2}}$type of reaction3. ______ $ce{al}$ + ______ $ce{br_{2}}
ightarrow$ ______ $ce{albr_{3}}$type of reaction4. ______ $ce{kclo_{3}}
ightarrow$ ______ $ce{kcl}$ + ______ $ce{o_{2}}$type of reaction5. ______ $ce{zn}$ + ______ $ce{hcl}
ightarrow$ ______ $ce{zncl_{2}}$ + ______ $ce{h_{2}}$type of reaction

Explanation:

Step1: Define reaction types

1. Synthesis: Two/more substances form one product.
2. Combustion: Fuel reacts with O₂ to produce oxides + energy.
3. Single Replacement: One element replaces another in a compound.
4. Double Replacement: Ions of two compounds swap places.
5. Decomposition: One compound breaks into two/more substances.

---

Step1 (Q1): Balance N atoms

$$\ce{N2 + H2 -> 2NH3}$$

Step2 (Q1): Balance H atoms

$$\ce{N2 + 3H2 -> 2NH3}$$

Step3 (Q1): Identify reaction type

Two reactants form one product: Synthesis

---

Step1 (Q2): Balance Au atoms

$$\ce{Au2O3 -> 2Au + O2}$$

Step2 (Q2): Balance O atoms

$$\ce{2Au2O3 -> 4Au + 3O2}$$

Step3 (Q2): Identify reaction type

One compound breaks into two substances: Decomposition

---

Step1 (Q3): Balance Br atoms

$$\ce{Al + 3Br2 -> 2AlBr3}$$

Step2 (Q3): Balance Al atoms

$$\ce{2Al + 3Br2 -> 2AlBr3}$$

Step3 (Q3): Identify reaction type

Two reactants form one product: Synthesis

---

Step1 (Q4): Balance O atoms

$$\ce{2KClO3 -> KCl + 3O2}$$

Step2 (Q4): Balance K/Cl atoms

$$\ce{2KClO3 -> 2KCl + 3O2}$$

Step3 (Q4): Identify reaction type

One compound breaks into two substances: Decomposition

---

Step1 (Q5): Balance Cl atoms

$$\ce{Zn + 2HCl -> ZnCl2 + H2}$$

Step2 (Q5): Verify all atoms balanced

$$\ce{Zn + 2HCl -> ZnCl2 + H2}$$

Step3 (Q5): Identify reaction type

Element replaces ion in compound: Single Replacement

Answer:

Definitions:

• Synthesis: A reaction where two or more reactants combine to form a single product.
• Combustion: A reaction where a substance reacts with oxygen, typically producing oxides and releasing energy.
• Single Replacement: A reaction where one element displaces another element in a compound.
• Double Replacement: A reaction where the cations and anions of two different compounds swap places.
• Decomposition: A reaction where a single compound breaks down into two or more simpler substances.

Balanced Equations & Reaction Types:

1. $\ce{1N2 + 3H2 -> 2NH3}$; Type of reaction: Synthesis
2. $\ce{2Au2O3 -> 4Au + 3O2}$; Type of reaction: Decomposition
3. $\ce{2Al + 3Br2 -> 2AlBr3}$; Type of reaction: Synthesis
4. $\ce{2KClO3 -> 2KCl + 3O2}$; Type of reaction: Decomposition
5. $\ce{1Zn + 2HCl -> 1ZnCl2 + 1H2}$; Type of reaction: Single Replacement