The process of adjusting the coefficients (the numbers placed before chemical formulas) in a chemical equation so that the number of atoms of each element.
Atoms can't appear or disappear — every atom on the left must show up on the right.
Showing a random 20 of 50 problems.
Example 1
medium
Balance: C3H8+O2→CO2+H2O.
Example 2
medium
Why does changing H2O to H2O2 to balance oxygen break the rule?
Example 3
medium
Balance: Al+HCl→AlCl3+H2.
Example 4
medium
Balance: Al+O2→Al2O3.
Example 5
easy
To balance an equation you adjust which numbers?
Example 6
hard
Balance: Al+Fe2O3→Al2O3+Fe (thermite).
Example 7
easy
Balance the equation: Fe+O2→Fe2O3.
Example 8
medium
Balance: Fe+O2→Fe2O3.
Example 9
hard
Balance: Fe2(SO4)3+NaOH→Fe(OH)3+Na2SO4.
Example 10
easy
In the balanced equation 2H2+O2→2H2O, how many H atoms appear on each side?
Example 11
hard
Balance: H2S+O2→SO2+H2O.
Example 12
hard
Balance: Ca(OH)2+H3PO4→Ca3(PO4)2+H2O.
Example 13
medium
Balance: NH3+O2→NO+H2O.
Example 14
medium
Balance: Al+HCl→AlCl3+H2.
Example 15
hard
Balance: Ag2O→Ag+O2.
Example 16
medium
Balance: CH4+O2→CO2+H2O.
Example 17
medium
Balance the equation for the formation of ammonia: N2+H2→NH3.