Question

1. ____ag₂o (s)

__ag + __o₂

1. __s (s) + o₂ (g) → __so₃
2. __n₂o₅ (g) + h₂o (l) → __hno₃
3. __cao (s) + h₂o (l) → __ca(oh)₂
4. ____h₂o₂ (l)

__h₂ + __o₂

1. __ch₄ + o₂ → h₂o + __co₂
2. __srf₂ + na₂so₄ → srso₄ + __naf
3. __pb(no₃)₂ + k₂cro₄ → pbcro₄ + __kno₃
4. __k₂so₄ + bacl₂ → kcl + __baso₄
5. __koh + h₂so₄ → k₂so₄ + __h₂o
6. __fe + h₂so₄ → fe₂(so₄)₃ + __h₂

Explanation:

Step1: Balance Eq.11 (decomposition)

Balance Ag first, then O.
$2\text{Ag}_2\text{O}(s)
ightarrow 4\text{Ag} + \text{O}_2$

Step2: Balance Eq.12 (combustion)

Balance S, then O.
$\text{S}(s) + \text{O}_2(g)
ightarrow \text{SO}_2$

Step3: Balance Eq.13 (combination)

Balance N, then H/O.
$\text{N}_2\text{O}_5(g) + \text{H}_2\text{O}(l)
ightarrow 2\text{HNO}_3$

Step4: Balance Eq.14 (combination)

Count all atoms on each side.
$\text{CaO}(s) + \text{H}_2\text{O}(l)
ightarrow \text{Ca(OH)}_2$

Step5: Balance Eq.15 (decomposition)

Balance H, then O.
$2\text{H}_2\text{O}_2(l)
ightarrow 2\text{H}_2 + \text{O}_2$

Step6: Balance Eq.16 (combustion)

Balance C, H, then O.
$\text{CH}_4 + 2\text{O}_2
ightarrow 2\text{H}_2\text{O} + \text{CO}_2$

Step7: Balance Eq.17 (double displacement)

Balance Sr, Na, F, then SO₄.
$\text{SrF}_2 + \text{Na}_2\text{SO}_4
ightarrow \text{SrSO}_4 + 2\text{NaF}$

Step8: Balance Eq.18 (double displacement)

Balance Pb, CrO₄, K, then NO₃.
$\text{Pb(NO}_3\text{)}_2 + \text{K}_2\text{CrO}_4
ightarrow \text{PbCrO}_4 + 2\text{KNO}_3$

Step9: Balance Eq.19 (double displacement)

Balance Ba, SO₄, K, then Cl.
$\text{K}_2\text{SO}_4 + \text{BaCl}_2
ightarrow 2\text{KCl} + \text{BaSO}_4$

Step10: Balance Eq.20 (neutralization)

Balance K, SO₄, then H/O.
$2\text{KOH} + \text{H}_2\text{SO}_4
ightarrow \text{K}_2\text{SO}_4 + 2\text{H}_2\text{O}$

Step11: Balance Eq.21 (single displacement)

Balance Fe, SO₄, then H.
$2\text{Fe} + 3\text{H}_2\text{SO}_4
ightarrow \text{Fe}_2(\text{SO}_4)_3 + 3\text{H}_2$

Answer:

1. $2\text{Ag}_2\text{O}(s)

ightarrow 4\text{Ag} + \text{O}_2$

1. $\text{S}(s) + \text{O}_2(g)

ightarrow \text{SO}_2$

1. $\text{N}_2\text{O}_5(g) + \text{H}_2\text{O}(l)

ightarrow 2\text{HNO}_3$

1. $\text{CaO}(s) + \text{H}_2\text{O}(l)

ightarrow \text{Ca(OH)}_2$

1. $2\text{H}_2\text{O}_2(l)

ightarrow 2\text{H}_2 + \text{O}_2$

1. $\text{CH}_4 + 2\text{O}_2

ightarrow 2\text{H}_2\text{O} + \text{CO}_2$

1. $\text{SrF}_2 + \text{Na}_2\text{SO}_4

ightarrow \text{SrSO}_4 + 2\text{NaF}$

1. $\text{Pb(NO}_3\text{)}_2 + \text{K}_2\text{CrO}_4

ightarrow \text{PbCrO}_4 + 2\text{KNO}_3$

1. $\text{K}_2\text{SO}_4 + \text{BaCl}_2

ightarrow 2\text{KCl} + \text{BaSO}_4$

1. $2\text{KOH} + \text{H}_2\text{SO}_4

ightarrow \text{K}_2\text{SO}_4 + 2\text{H}_2\text{O}$

1. $2\text{Fe} + 3\text{H}_2\text{SO}_4

ightarrow \text{Fe}_2(\text{SO}_4)_3 + 3\text{H}_2$