Balancing Equations

Front

What do the blue numbers in a chemical formula represent?

Back

Subscripts

Front

Is the equation N2 + H2 = NH4 balanced or unbalanced?

Back

Unbalanced

Front

What is a coefficient in a chemical equation?

Back

The large number to the left of a formula.

Front

Which of the following equations is balanced? PbO2 + 2H2, SO2 + H2O --> H2SO4, 2Na + 2H2O --> 2NaOH + H2

Back

2Na + 2H2O --> 2NaOH + H2

Front

What is the correct ratio of chemicals for the balanced equation H2SO3 + KOH --> H2O + K2SO3?

Back

1,2 --> 2,1

Front

What is the purpose of balancing chemical equations?

Back

To ensure the law of conservation of mass is followed.

Front

What does it mean for a chemical equation to be balanced?

Back

The number of atoms for each element is the same on both sides of the equation.

Front

What is the difference between subscripts and coefficients?

Back

Subscripts indicate the number of atoms in a molecule; coefficients indicate the number of molecules.

Front

How do you balance the equation H2 + O2 --> H2O?

Back

2H2 + O2 --> 2H2O

Front

What is the balanced equation for the combustion of methane (CH4)?

Back

CH4 + 2O2 --> CO2 + 2H2O