Balancing Chemical Equations Quiz

What is the first step in balancing a chemical equation?

• Remove extra atoms from the equation

• Change the subscripts of the compounds

• Count the number of atoms on each side

• Add coefficients to the compounds

Why can't you change subscripts when balancing chemical equations?

• It is not allowed in chemistry

• It changes the identity of the compound

• It makes the equation unbalanced

• It is mathematically incorrect

How do you balance the oxygen atoms in the equation H2 + O2 → H2O?

• Add a subscript to O2

• Add a coefficient of 3 in front of H2O

• Add a coefficient of 2 in front of H2O

• Add a coefficient of 2 in front of O2

What should you do if the hydrogen atoms are not balanced after adjusting the oxygen atoms?

• Add a coefficient to the hydrogen compound

• Remove hydrogen atoms

• Change the subscript of hydrogen

• Add more oxygen atoms

What is the final balanced form of the equation H2 + O2 → H2O?

• 2H2 + O2 → 2H2O

• 2H2 + 2O2 → 2H2O

• H2 + O2 → 2H2O

• H2 + 2O2 → H2O