Question

balancing & types of reactions practice
name: indira date: 2 / 11 pd: 1 2 3 4 5 6 7
the 5 types of reactions:
synthesis: $\text{a} + \text{b} \
ightarrow \text{ab}$
decomposition: $\text{ab} \
ightarrow \text{a} + \text{b}$
single displacement: $\text{a} + \text{bc} \
ightarrow \text{ac} + \text{b}$
double displacement: $\text{ab} + \text{cd} \
ightarrow \text{ad} + \text{cb}$
combustion: $\text{cxhy} + \text{o}_2 \
ightarrow \text{co}_2 + \text{h}_2\text{o}$
balance the following reactions and indicate which of the five types of chemical reaction are being represented:

1. $\underline{\quad\quad} \text{nabr} + \underline{\quad\quad} \text{ca(oh)}_2 \

ightarrow \underline{\quad\quad} \text{cabr}_2 + \underline{\quad\quad} \text{naoh}$ reaction type: $\underline{\quad\quad\quad\quad\quad}$

1. $\underline{\quad\quad} \text{h}_2 + \underline{\quad\quad} \text{cl}_2 \

ightarrow \underline{\quad\quad} \text{hcl}$ reaction type: $\underline{\quad\quad\quad\quad\quad}$

1. $\underline{\quad\quad} \text{c}_3\text{h}_8 + \underline{\quad\quad} \text{o}_2 \

ightarrow \underline{\quad\quad} \text{co}_2 + \underline{\quad\quad} \text{h}_2\text{o}$ reaction type: $\underline{\quad\quad\quad\quad\quad}$

1. $\underline{\quad\quad} \text{h}_2\text{co}_3 \

ightarrow \underline{\quad\quad} \text{h}_2\text{o} + \underline{\quad\quad} \text{co}_2$ reaction type: $\underline{\quad\quad\quad\quad\quad}$

1. $\underline{\quad\quad} \text{li}_3\text{n} + \underline{\quad\quad} \text{nh}_4\text{no}_3 \

ightarrow \underline{\quad\quad} \text{lino}_3 + \underline{\quad\quad} \text{(nh}_4\text{)}_3\text{n}$ reaction type: $\underline{\quad\quad\quad\quad\quad}$

1. $\underline{\quad\quad} \text{hbr} + \underline{\quad\quad} \text{al(oh)}_3 \

ightarrow \underline{\quad\quad} \text{h}_2\text{o} + \underline{\quad\quad} \text{albr}_3$ reaction type: $\underline{\quad\quad\quad\quad\quad}$

Explanation:

Step1: Balance NaBr + Ca(OH)₂

Balance Br, Na, OH groups.
$2\text{NaBr} + \text{Ca(OH)}_2
ightarrow \text{CaBr}_2 + 2\text{NaOH}$
Classify: Double Displacement

Step2: Balance H₂ + Cl₂

Balance H and Cl atoms.
$\text{H}_2 + \text{Cl}_2
ightarrow 2\text{HCl}$
Classify: Synthesis

Step3: Balance C₃H₈ + O₂

Balance C, H, then O atoms.
$\text{C}_3\text{H}_8 + 5\text{O}_2
ightarrow 3\text{CO}_2 + 4\text{H}_2\text{O}$
Classify: Combustion

Step4: Balance H₂CO₃ → H₂O + CO₂

Atoms are already balanced.
$\text{H}_2\text{CO}_3
ightarrow \text{H}_2\text{O} + \text{CO}_2$
Classify: Decomposition

Step5: Balance Li₃N + NH₄NO₃

Balance Li, N, O atoms.
$\text{Li}_3\text{N} + 3\text{NH}_4\text{NO}_3
ightarrow 3\text{LiNO}_3 + (\text{NH}_4)_3\text{N}$
Classify: Double Displacement

Step6: Balance HBr + Al(OH)₃

Balance Br, Al, O, H atoms.
$3\text{HBr} + \text{Al(OH)}_3
ightarrow 3\text{H}_2\text{O} + \text{AlBr}_3$
Classify: Double Displacement

Answer:

1. $2\text{NaBr} + \text{Ca(OH)}_2

ightarrow \text{CaBr}_2 + 2\text{NaOH}$; Reaction Type: Double Displacement

1. $\text{H}_2 + \text{Cl}_2

ightarrow 2\text{HCl}$; Reaction Type: Synthesis

1. $\text{C}_3\text{H}_8 + 5\text{O}_2

ightarrow 3\text{CO}_2 + 4\text{H}_2\text{O}$; Reaction Type: Combustion

1. $\text{H}_2\text{CO}_3

ightarrow \text{H}_2\text{O} + \text{CO}_2$; Reaction Type: Decomposition

1. $\text{Li}_3\text{N} + 3\text{NH}_4\text{NO}_3

ightarrow 3\text{LiNO}_3 + (\text{NH}_4)_3\text{N}$; Reaction Type: Double Displacement

1. $3\text{HBr} + \text{Al(OH)}_3

ightarrow 3\text{H}_2\text{O} + \text{AlBr}_3$; Reaction Type: Double Displacement