Question

types of chemical reactions
balance each of the following reactions. then, classify each of the following reactions as either,
synthesis (combination), decomposition, single replacement, double replacement, or
combustion.

1. \\( 2h_2 + o_2 \

ightarrow 2h_2o \\) \\( \underline{\quad\quad\quad\text{synthesis}\quad\quad\quad} \\)

1. \\( h_2o \

ightarrow h_2 + o_2 \\) \\( \underline{\quad\quad\quad\quad\quad\quad\quad\quad} \\)

1. \\( zn + h_2so_4 \

ightarrow znso_4 + h_2 \\) \\( \underline{\quad\quad\quad\quad\quad\quad\quad\quad} \\)

1. \\( co + o_2 \

ightarrow co_2 \\) \\( \underline{\quad\quad\quad\quad\quad\quad\quad\quad} \\)

1. \\( hgo \

ightarrow hg + o_2 \\) \\( \underline{\quad\quad\quad\quad\quad\quad\quad\quad} \\)

1. \\( kbr + cl_2 \

ightarrow kcl + br_2 \\) \\( \underline{\quad\quad\quad\quad\quad\quad\quad\quad} \\)

1. \\( cao + h_2o \

ightarrow ca(oh)_2 \\) \\( \underline{\quad\quad\quad\quad\quad\quad\quad\quad} \\)

1. \\( agno_3 + nacl \

ightarrow agcl + nano_3 \\) \\( \underline{\quad\quad\quad\quad\quad\quad\quad\quad} \\)

1. \\( h_2o_2 \

ightarrow h_2o + o_2 \\) \\( \underline{\quad\quad\quad\quad\quad\quad\quad\quad} \\)

1. \\( ca(oh)_2 + h_2so_4 \

ightarrow caso_4 + h_2o \\) \\( \underline{\quad\quad\quad\quad\quad\quad\quad\quad} \\)

Explanation:

Step1: Balance & classify reaction 2

Balance: $2H_2O
ightarrow 2H_2 + O_2$
Type: Decomposition (one compound breaks into simpler substances)

Step2: Balance & classify reaction 3

Reaction is already balanced: $Zn + H_2SO_4
ightarrow ZnSO_4 + H_2$
Type: Single replacement (one element replaces another in a compound)

Step3: Balance & classify reaction 4

Balance: $2CO + O_2
ightarrow 2CO_2$
Type: Synthesis (two substances form one compound; also combustion of CO, but synthesis is primary here)

Step4: Balance & classify reaction 5

Balance: $2HgO
ightarrow 2Hg + O_2$
Type: Decomposition (one compound breaks into simpler substances)

Step5: Balance & classify reaction 6

Balance: $2KBr + Cl_2
ightarrow 2KCl + Br_2$
Type: Single replacement (one element replaces another in a compound)

Step6: Balance & classify reaction 7

Reaction is already balanced: $CaO + H_2O
ightarrow Ca(OH)_2$
Type: Synthesis (two substances form one compound)

Step7: Balance & classify reaction 8

Reaction is already balanced: $AgNO_3 + NaCl
ightarrow AgCl + NaNO_3$
Type: Double replacement (ions swap between two compounds)

Step8: Balance & classify reaction 9

Balance: $2H_2O_2
ightarrow 2H_2O + O_2$
Type: Decomposition (one compound breaks into simpler substances)

Step9: Balance & classify reaction 10

Balance: $Ca(OH)_2 + H_2SO_4
ightarrow CaSO_4 + 2H_2O$
Type: Double replacement (ions swap between two compounds; neutralization subset)

Answer:

1. (Already balanced) synthesis
2. $2H_2O

ightarrow 2H_2 + O_2$; decomposition

1. (Already balanced) single replacement
2. $2CO + O_2

ightarrow 2CO_2$; synthesis

1. $2HgO

ightarrow 2Hg + O_2$; decomposition

1. $2KBr + Cl_2

ightarrow 2KCl + Br_2$; single replacement

1. (Already balanced) synthesis
2. (Already balanced) double replacement
3. $2H_2O_2

ightarrow 2H_2O + O_2$; decomposition

1. $Ca(OH)_2 + H_2SO_4

ightarrow CaSO_4 + 2H_2O$; double replacement