Question

balancing chemical equations worksheet
count your atoms and then balance the equation. show all work

1. $\boldsymbol{2}$ $ce{h_{2}}$ + ____ $ce{o_{2}}$ $

ightarrow$ $\boldsymbol{2}$ $ce{h_{2}o}$

1. $\boldsymbol{2}$ $ce{mg}$ + ____ $ce{o_{2}}$ $

ightarrow$ $\boldsymbol{2}$ $ce{mgo}$

1. $\boldsymbol{2}$ $ce{li}$ + ____ $ce{f_{2}}$ $

ightarrow$ $\boldsymbol{2}$ $ce{lif}$

1. $\boldsymbol{4}$ $ce{k}$ + ____ $ce{o_{2}}$ $

ightarrow$ $\boldsymbol{2}$ $ce{k_{2}o}$

1. $\boldsymbol{2}$ $ce{h_{2}o_{2}}$ $

ightarrow$ ____ $ce{h_{2}o}$ + $\boldsymbol{2}$ $ce{o_{2}}$

1. $\boldsymbol{2}$ $ce{al}$ + ____ $ce{cl_{2}}$ $

ightarrow$ $\boldsymbol{2}$ $ce{alcl_{3}}$

1. $\boldsymbol{2}$ $ce{ag_{2}o}$$

ightarrow$ ____ $ce{ag}$ + $\boldsymbol{4}$ $ce{o_{2}}$

1. $\boldsymbol{3}$ $ce{h_{2}}$ + ____ $ce{n_{2}}$ $

ightarrow$ $\boldsymbol{2}$ $ce{nh_{3}}$

Explanation:

Step1: Balance O atoms (Eq1)

Initial: $\ce{2H2 + _O2 -> 2H2O}$; O: 2 on left, 2 on right → coefficient 1 for $\ce{O2}$

Step2: Balance O atoms (Eq2)

Initial: $\ce{2Mg + _O2 -> 2MgO}$; O: 2 on left, 2 on right → coefficient 1 for $\ce{O2}$

Step3: Balance F atoms (Eq3)

Initial: $\ce{2Li + _F2 -> 2LiF}$; F: 2 on left, 2 on right → coefficient 1 for $\ce{F2}$

Step4: Balance O atoms (Eq4)

Initial: $\ce{4K + _O2 -> 2K2O}$; O: 2 on left, 2 on right → coefficient 1 for $\ce{O2}$

Step5: Balance H/O atoms (Eq5)

Initial: $\ce{2H2O2 -> _H2O + 2O2}$; Adjust: $\ce{2H2O2 -> 2H2O + 1O2}$ (H:4, O:4 on both sides)

Step6: Balance Cl atoms (Eq6)

Initial: $\ce{2Al + _Cl2 -> 2AlCl3}$; Cl: 6 on right → coefficient 3 for $\ce{Cl2}$

Step7: Balance Ag/O atoms (Eq7)

Initial: $\ce{2Ag2O -> _Ag + 4O2}$; Adjust: $\ce{2Ag2O -> 4Ag + 1O2}$ (Ag:4, O:2 on both sides)

Step8: Balance N atoms (Eq8)

Initial: $\ce{3H2 + _N2 -> 2NH3}$; N: 2 on left, 2 on right → coefficient 1 for $\ce{N2}$

Answer:

1. $\boldsymbol{1}$ $\ce{O2}$ (balanced: $\ce{2H2 + 1O2 -> 2H2O}$)
2. $\boldsymbol{1}$ $\ce{O2}$ (balanced: $\ce{2Mg + 1O2 -> 2MgO}$)
3. $\boldsymbol{1}$ $\ce{F2}$ (balanced: $\ce{2Li + 1F2 -> 2LiF}$)
4. $\boldsymbol{1}$ $\ce{O2}$ (balanced: $\ce{4K + 1O2 -> 2K2O}$)
5. $\boldsymbol{2}$ $\ce{H2O}$ (balanced: $\ce{2H2O2 -> 2H2O + 1O2}$)
6. $\boldsymbol{3}$ $\ce{Cl2}$ (balanced: $\ce{2Al + 3Cl2 -> 2AlCl3}$)
7. $\boldsymbol{4}$ $\ce{Ag}$ (balanced: $\ce{2Ag2O -> 4Ag + 1O2}$)
8. $\boldsymbol{1}$ $\ce{N2}$ (balanced: $\ce{3H2 + 1N2 -> 2NH3}$)