Question

balancing act practice
balance each equation. be sure to show your lists! remember you cannot add subscripts or place coefficients in the middle of a chemical formula.

1. na + mgf₂ → naf + mg
2. mg + hcl → mgcl₂ + h₂
3. cl₂ + ki → kcl + i₂
4. nacl → na + cl₂
5. na + o₂ → na₂o
6. na + hcl → h₂ + nacl
7. k + cl₂ → kcl

challenge: this one is tough!
c₂h₆ + o₂ → co₂ + h₂o

Explanation:

Step1: Balance equation 1

$2Na + MgF_2
ightarrow 2NaF+Mg$

Step2: Balance equation 2

$Mg + 2HCl
ightarrow MgCl_2 + H_2$

Step3: Balance equation 3

$Cl_2+2KI
ightarrow 2KCl + I_2$

Step4: Balance equation 4

$2NaCl
ightarrow 2Na + Cl_2$

Step5: Balance equation 5

$4Na + O_2
ightarrow 2Na_2O$

Step6: Balance equation 6

$2Na + 2HCl
ightarrow H_2+2NaCl$

Step7: Balance equation 7

$2K + Cl_2
ightarrow 2KCl$

Step8: Balance challenge equation

$2C_2H_6+7O_2
ightarrow 4CO_2 + 6H_2O$

Answer:

1. $2Na + MgF_2

ightarrow 2NaF+Mg$

1. $Mg + 2HCl

ightarrow MgCl_2 + H_2$

1. $Cl_2+2KI

ightarrow 2KCl + I_2$

1. $2NaCl

ightarrow 2Na + Cl_2$

1. $4Na + O_2

ightarrow 2Na_2O$

1. $2Na + 2HCl

ightarrow H_2+2NaCl$

1. $2K + Cl_2

ightarrow 2KCl$
Challenge: $2C_2H_6+7O_2
ightarrow 4CO_2 + 6H_2O$