Balancing Chemical Equations Practice

What is the first step when balancing a chemical equation?

• Count the atoms on both sides

• Add coefficients to balance oxygen

• Draw a line down the middle

• Balance the metals first

What coefficient is needed for HCl to balance the equation Zn + HCl → ZnCl2 + H2?

• 1

• 2

• 3

• 4

To balance the iron atoms in the equation Fe + O2 → Fe3O4, what coefficient should be placed in front of Fe?

• 1

• 2

• 3

• 4

After balancing the iron atoms in Fe + O2 → Fe3O4, what coefficient is needed for O2 to balance the oxygen atoms?

• 1

• 2

• 3

• 4

In the balanced equation 4KClO3 → 3KClO4 + KCl, what are the coefficients for KClO3 and KClO4, respectively?

• 2 and 1

• 4 and 3

• 3 and 4

• 1 and 1