Chemistry Examples

The law of conservation of mass states that matter cannot be created nor destroyed. There are no more or less atoms at the end of a chemical reaction than there were at the beginning. To balance a chemical equation, every element must have the same number of atoms on each side of the equation.

${\displaystyle Ni}$ is a balanced element because there is the same number of atoms of ${\displaystyle Ni}$ in each side of the equation.

${\displaystyle S}$ is a balanced element because there is the same number of atoms of ${\displaystyle S}$ in each side of the equation.

${\displaystyle H}$ is a balanced element because there is the same number of atoms of ${\displaystyle H}$ in each side of the equation.

${\displaystyle Cl}$ is not a balanced element. To balance ${\displaystyle Cl}$, multiply ${\displaystyle HCl}$ from the left side by ${\displaystyle 2}$.

${\displaystyle H}$ is not a balanced element. To balance ${\displaystyle H}$, multiply ${\displaystyle HN{O}_3}$ from the left side by ${\displaystyle 2}$ and ${\displaystyle H_{2}O}$ from the right side by ${\displaystyle 3}$.

${\displaystyle N}$ is not a balanced element. To balance ${\displaystyle N}$, multiply ${\displaystyle NO}$ from the right side by ${\displaystyle 2}$.

${\displaystyle O}$ is not a balanced element. To balance ${\displaystyle O}$, multiply ${\displaystyle HN{O}_3}$ from the left side by ${\displaystyle 2}$ and ${\displaystyle 2NO,3H_{2}O}$ from the right side by ${\displaystyle 4}$.

${\displaystyle Ni}$ is a balanced element because there is the same number of atoms of ${\displaystyle Ni}$ in each side of the equation.

${\displaystyle S}$ is a balanced element because there is the same number of atoms of ${\displaystyle S}$ in each side of the equation.

${\displaystyle H}$ is not a balanced element. To balance ${\displaystyle H}$, multiply ${\displaystyle 2HCl}$ from the left side by ${\displaystyle 2}$.

${\displaystyle Cl}$ is not a balanced element. To balance ${\displaystyle Cl}$, multiply ${\displaystyle NiC{l}_2}$ from the right side by ${\displaystyle 2}$.

${\displaystyle N}$ is a balanced element because there is the same number of atoms of ${\displaystyle N}$ in each side of the equation.

${\displaystyle O}$ is a balanced element because there is the same number of atoms of ${\displaystyle O}$ in each side of the equation.

${\displaystyle Ni}$ is not a balanced element. To balance ${\displaystyle Ni}$, multiply ${\displaystyle NiS}$ from the left side by ${\displaystyle 2}$.

${\displaystyle S}$ is not a balanced element. To balance ${\displaystyle S}$, multiply ${\displaystyle S}$ from the right side by ${\displaystyle 2}$.

${\displaystyle H}$ is not a balanced element. To balance ${\displaystyle H}$, multiply ${\displaystyle 4HCl}$ from the left side by ${\displaystyle 6}$ and from the right side by ${\displaystyle 3}$.

${\displaystyle Cl}$ is not a balanced element. To balance ${\displaystyle Cl}$, multiply ${\displaystyle 4HCl}$ from the left side by ${\displaystyle 6}$ and ${\displaystyle 2NiC{l}_2}$ from the right side by ${\displaystyle 3}$.

${\displaystyle H}$ is a balanced element because there is the same number of atoms of ${\displaystyle H}$ in each side of the equation.

${\displaystyle N}$ is a balanced element because there is the same number of atoms of ${\displaystyle N}$ in each side of the equation.

${\displaystyle O}$ is a balanced element because there is the same number of atoms of ${\displaystyle O}$ in each side of the equation.

${\displaystyle Ni}$ is not a balanced element. To balance ${\displaystyle Ni}$, multiply ${\displaystyle 2NiS}$ from the left side by ${\displaystyle 3}$ and from the right side by ${\displaystyle 2}$.

${\displaystyle S}$ is not a balanced element. To balance ${\displaystyle S}$, multiply ${\displaystyle 2NiS}$ from the left side by ${\displaystyle 3}$ and ${\displaystyle 2S}$ from the right side by ${\displaystyle 3}$.

${\displaystyle H}$ is a balanced element because there is the same number of atoms of ${\displaystyle H}$ in each side of the equation.

${\displaystyle Cl}$ is a balanced element because there is the same number of atoms of ${\displaystyle Cl}$ in each side of the equation.

${\displaystyle H}$ is a balanced element because there is the same number of atoms of ${\displaystyle H}$ in each side of the equation.

${\displaystyle N}$ is a balanced element because there is the same number of atoms of ${\displaystyle N}$ in each side of the equation.

${\displaystyle O}$ is a balanced element because there is the same number of atoms of ${\displaystyle O}$ in each side of the equation.