Question

section ii: balancing chemical equations
balance the following chemical equations. make sure your coefficients are lowest whole number ratio possible.

1. __zr2o3 + sn → zr + __sno2
2. __c6h12 + o2 → co2 + __h2o
3. __al + hcl → alcl3 + __h2
4. __sio2 +cl2 → sicl4 + __o2cl2
5. __pbo2 + cri3 → pbi4 + __cr2o3
6. __kno3 → k2o + n2 + __o2
7. __ch2o + o2 → co2 + __h2o
8. __cr + fe(no3)2 → fe + __cr(no3)2
9. __fe(oh)2 + h3po4 → fe3(po4)2 + __h2o
10. __as + o2 → __as2o5
11. __fe3o4 + h2 → fe + __h2o

12.__cd(no3)2 + na2s → nano3 + __cds

1. __c12h22o11 + o2 → co2 + __h2o

14.__pbo2 + cri3 → pbi4 + __cr2o3

1. __sn(no3)2 + lif → snf2 + __li(no3)

Explanation:

Step1: Balance the first equation

$2Zr_2O_3 + 3Sn
ightarrow4Zr + 3SnO_2$

Step2: Balance the second equation

$C_6H_{12}+9O_2
ightarrow6CO_2 + 6H_2O$

Step3: Balance the third equation

$2Al+6HCl
ightarrow2AlCl_3 + 3H_2$

Step4: Balance the fourth equation

$SiO_2 + 2Cl_2
ightarrow SiCl_4+O_2$ (Note: the product $O_2Cl_2$ is not a common compound, assuming it is a mis - write and should be $O_2$)

Step5: Balance the fifth equation

$3PbO_2+2CrI_3
ightarrow3PbI_4 + Cr_2O_3$

Step6: Balance the sixth equation

$4KNO_3
ightarrow2K_2O + 2N_2+5O_2$

Step7: Balance the seventh equation

$CH_2O+O_2
ightarrow CO_2+H_2O$

Step8: Balance the eighth equation

$Cr + Fe(NO_3)_2
ightarrow Fe+Cr(NO_3)_2$

Step9: Balance the ninth equation

$3Fe(OH)_2 + 2H_3PO_4
ightarrow Fe_3(PO_4)_2+6H_2O$

Step10: Balance the tenth equation

$4As + 5O_2
ightarrow2As_2O_5$

Step11: Balance the eleventh equation

$Fe_3O_4+4H_2
ightarrow3Fe + 4H_2O$

Step12: Balance the twelfth equation

$Cd(NO_3)_2+Na_2S
ightarrow2NaNO_3 + CdS$

Step13: Balance the thirteenth equation

$C_{12}H_{22}O_{11}+12O_2
ightarrow12CO_2 + 11H_2O$

Step14: Balance the fourteenth equation (same as fifth)

$3PbO_2+2CrI_3
ightarrow3PbI_4 + Cr_2O_3$

Step15: Balance the fifteenth equation

$Sn(NO_3)_2 + 2LiF
ightarrow SnF_2+2LiNO_3$

Answer:

1. $2,3,4,3$
2. $1,9,6,6$
3. $2,6,2,3$
4. $1,2,1,1$
5. $3,2,3,1$
6. $4,2,2,5$
7. $1,1,1,1$
8. $1,1,1,1$
9. $3,2,1,6$
10. $4,5,2$
11. $1,4,3,4$
12. $1,1,2,1$
13. $1,12,12,11$
14. $3,2,3,1$
15. $1,2,1,2$