Question

balancing chemical equations - worksheet #1
balance the following chemical equations:

1. __al (s) + hcl (aq) alcl3 (aq) + __h2 (g)
2. __k (s) + h2o (l) koh (aq) + __h2 (g)
3. __mg (s) + n2 (g) __mg3n2 (s)
4. __nano3 (s) nano2 (s) + __o2 (g)
5. __ca(oh)2 (s) + h3po4 (aq) ca3(po4)2 (s) + __h2o (l)
6. __c3h8 (g) + o2 (g) co2 (g) + __h2o (g)
7. __nh3 (g) + o2 (g) no (g) + __h2 (g)
8. __n2 (g) + h2 (g) __nh3 (g)
9. __na2co3 (s) + hcl (aq) nacl (aq) + co2 (g) + __h2o (l)
10. __c3h5oh (l) + o2 (g) co2 (g) + __h2o (g)
11. __nh3 (g) + cuo (s) n2 (g) + cu (s) + __h2o (g)
12. __cu (s) + agno3 (aq) ag (s) + __cu(no3)2 (aq)
13. __c12h22o11 (s) + o2 (g) co2 (g) + __h2o (g)
14. __feo (s) + o2 (g) __fe2o3 (s)
15. __cs2 (l) + nh3 (g) h2s (g) + __nh4scn (s)
16. __naoh (aq) + hno3 (aq) nano3 (aq) + __h2o (l)

Explanation:

Step1: Balance equation 1

Balance the number of atoms on both sides. For the reaction $\text{Al}(s)+\text{HCl}(aq)
ightarrow\text{AlCl}_3(aq)+\text{H}_2(g)$, we get $2\text{Al}(s) + 6\text{HCl}(aq)=2\text{AlCl}_3(aq)+3\text{H}_2(g)$

Step2: Balance equation 2

For $\text{K}(s)+\text{H}_2\text{O}(l)
ightarrow\text{KOH}(aq)+\text{H}_2(g)$, we have $2\text{K}(s)+2\text{H}_2\text{O}(l)=2\text{KOH}(aq)+\text{H}_2(g)$

Step3: Balance equation 3

For $\text{Mg}(s)+\text{N}_2(g)
ightarrow\text{Mg}_3\text{N}_2(s)$, it is $3\text{Mg}(s)+\text{N}_2(g)=\text{Mg}_3\text{N}_2(s)$

Step4: Balance equation 4

For $\text{NaNO}_3(s)
ightarrow\text{NaNO}_2(s)+\text{O}_2(g)$, we get $2\text{NaNO}_3(s)=2\text{NaNO}_2(s)+\text{O}_2(g)$

Step5: Balance equation 5

For $\text{Ca(OH)}_2(s)+\text{H}_3\text{PO}_4(aq)
ightarrow\text{Ca}_3(\text{PO}_4)_2(s)+\text{H}_2\text{O}(l)$, we have $3\text{Ca(OH)}_2(s)+2\text{H}_3\text{PO}_4(aq)=\text{Ca}_3(\text{PO}_4)_2(s)+6\text{H}_2\text{O}(l)$

Step6: Balance equation 6

For $\text{C}_3\text{H}_8(g)+\text{O}_2(g)
ightarrow\text{CO}_2(g)+\text{H}_2\text{O}(g)$, we get $\text{C}_3\text{H}_8(g)+5\text{O}_2(g)=3\text{CO}_2(g)+4\text{H}_2\text{O}(g)$

Step7: Balance equation 7

For $\text{NH}_3(g)+\text{O}_2(g)
ightarrow\text{NO}(g)+\text{H}_2(g)$, we have $4\text{NH}_3(g)+5\text{O}_2(g)=4\text{NO}(g)+6\text{H}_2(g)$

Step8: Balance equation 8

For $\text{N}_2(g)+\text{H}_2(g)
ightarrow\text{NH}_3(g)$, we get $\text{N}_2(g)+3\text{H}_2(g)=2\text{NH}_3(g)$

Step9: Balance equation 9

For $\text{Na}_2\text{CO}_3(s)+\text{HCl}(aq)
ightarrow\text{NaCl}(aq)+\text{CO}_2(g)+\text{H}_2\text{O}(l)$, we have $\text{Na}_2\text{CO}_3(s)+2\text{HCl}(aq)=2\text{NaCl}(aq)+\text{CO}_2(g)+\text{H}_2\text{O}(l)$

Step10: Balance equation 10

For $\text{C}_3\text{H}_5\text{OH}(l)+\text{O}_2(g)
ightarrow\text{CO}_2(g)+\text{H}_2\text{O}(g)$, we get $\text{C}_3\text{H}_5\text{OH}(l)+9\text{O}_2(g)=6\text{CO}_2(g)+8\text{H}_2\text{O}(g)$

Step11: Balance equation 11

For $\text{NH}_3(g)+\text{CuO}(s)
ightarrow\text{N}_2(g)+\text{Cu}(s)+\text{H}_2\text{O}(g)$, we have $2\text{NH}_3(g)+3\text{CuO}(s)=\text{N}_2(g)+3\text{Cu}(s)+3\text{H}_2\text{O}(g)$

Step12: Balance equation 12

For $\text{Cu}(s)+\text{AgNO}_3(aq)
ightarrow\text{Ag}(s)+\text{Cu(NO}_3)_2(aq)$, we get $\text{Cu}(s)+2\text{AgNO}_3(aq)=2\text{Ag}(s)+\text{Cu(NO}_3)_2(aq)$

Step13: Balance equation 13

For $\text{C}_{12}\text{H}_{22}\text{O}_{11}(s)+\text{O}_2(g)
ightarrow\text{CO}_2(g)+\text{H}_2\text{O}(g)$, we get $\text{C}_{12}\text{H}_{22}\text{O}_{11}(s)+12\text{O}_2(g)=12\text{CO}_2(g)+11\text{H}_2\text{O}(g)$

Step14: Balance equation 14

For $\text{FeO}(s)+\text{O}_2(g)
ightarrow\text{Fe}_2\text{O}_3(s)$, we get $4\text{FeO}(s)+\text{O}_2(g)=2\text{Fe}_2\text{O}_3(s)$

Step15: Balance equation 15

For $\text{CS}_2(l)+\text{NH}_3(g)
ightarrow\text{H}_2\text{S}(g)+\text{NH}_4\text{SCN}(s)$, we get $\text{CS}_2(l)+2\text{NH}_3(g)=\text{H}_2\text{S}(g)+\text{NH}_4\text{SCN}(s)$

Step16: Balance equation 16

For $\text{NaOH}(aq)+\text{HNO}_3(aq)
ightarrow\text{NaNO}_3(aq)+\text{H}_2\text{O}(l)$, we get $\text{NaOH}(aq)+\text{HNO}_3(aq)=\text{NaNO}_3(aq)+\text{H}_2\text{O}(l)$

Answer:

1. $2\text{Al}(s) + 6\text{HCl}(aq)=2\text{AlCl}_3(aq)+3\text{H}_2(g)$
2. $2\text{K}(s)+2\text{H}_2\text{O}(l)=2\text{KOH}(aq)+\text{H}_2(g)$
3. $3\text{Mg}(s)+\text{N}_2(g)=\text{Mg}_3\text{N}_2(s)$
4. $2\text{NaNO}_3(s)=2\text{NaNO}_2(s)+\text{O}_2(g)$
5. $3\text{Ca(OH)}_2(s)+2\text{H}_3\text{PO}_4(aq)=\text{Ca}_3(\text{PO}_4)_2(s)+6\text{H}_2\text{O}(l)$
6. $\text{C}_3\text{H}_8(g)+5\text{O}_2(g)=3\text{CO}_2(g)+4\text{H}_2\text{O}(g)$
7. $4\text{NH}_3(g)+5\text{O}_2(g)=4\text{NO}(g)+6\text{H}_2(g)$
8. $\text{N}_2(g)+3\text{H}_2(g)=2\text{NH}_3(g)$
9. $\text{Na}_2\text{CO}_3(s)+2\text{HCl}(aq)=2\text{NaCl}(aq)+\text{CO}_2(g)+\text{H}_2\text{O}(l)$
10. $\text{C}_3\text{H}_5\text{OH}(l)+9\text{O}_2(g)=6\text{CO}_2(g)+8\text{H}_2\text{O}(g)$
11. $2\text{NH}_3(g)+3\text{CuO}(s)=\text{N}_2(g)+3\text{Cu}(s)+3\text{H}_2\text{O}(g)$
12. $\text{Cu}(s)+2\text{AgNO}_3(aq)=2\text{Ag}(s)+\text{Cu(NO}_3)_2(aq)$
13. $\text{C}_{12}\text{H}_{22}\text{O}_{11}(s)+12\text{O}_2(g)=12\text{CO}_2(g)+11\text{H}_2\text{O}(g)$
14. $4\text{FeO}(s)+\text{O}_2(g)=2\text{Fe}_2\text{O}_3(s)$
15. $\text{CS}_2(l)+2\text{NH}_3(g)=\text{H}_2\text{S}(g)+\text{NH}_4\text{SCN}(s)$
16. $\text{NaOH}(aq)+\text{HNO}_3(aq)=\text{NaNO}_3(aq)+\text{H}_2\text{O}(l)$