Question

1. check the box if the statement describes the balanced or unbalanced for the equations.

4sb + 3o₂ → sb₄o₆
h₃aso₄ → as₂o₅ + h₂o
sio₂ + hf → sif₄ + h₂o
ch₄ + 2o₂ → co₂ + 2h₂o
co₂ + nh₃ → oc + h₂o
unbalanced
balanced

Explanation:

Step1: Check Sb and O atoms

Left: $4$ Sb, $3\times2=6$ O; Right: $4$ Sb, $6$ O. Balanced.

Step2: Check As, H, O atoms

Left: $1$ As, $3$ H, $4$ O; Right: $2$ As, $2$ H, $3+1=4$ O. Unbalanced.

Step3: Check Si, F, H, O atoms

Left: $1$ Si, $1$ F, $1$ H, $2$ O; Right: $1$ Si, $4$ F, $2$ H, $1$ O. Unbalanced.

Step4: Check C, H, O atoms

Left: $1$ C, $4$ H, $2\times2=4$ O; Right: $1$ C, $2\times2=4$ H, $2+2=4$ O. Balanced.

Step5: Check C, N, H, O atoms

Left: $1$ C, $1$ N, $3$ H, $2$ O; Right: $1$ C, $1$ N, $2$ H, $1+1=2$ O. Unbalanced.

Answer:

1. $\boldsymbol{4Sb + 3O_2

ightarrow Sb_4O_6}$: Check Balanced box

1. $\boldsymbol{H_3AsO_4

ightarrow As_2O_5 + H_2O}$: Check Unbalanced box

1. $\boldsymbol{SiO_2+HF

ightarrow SiF_4 + H_2O}$: Check Unbalanced box

1. $\boldsymbol{CH_4 + 2O_2

ightarrow CO_2 + 2H_2O}$: Check Balanced box

1. $\boldsymbol{CO_2 + NH_3

ightarrow OC + H_2O}$: Check Unbalanced box