Balancing Chemical Equations

What is the chemical formula for hydrochloric acid?

• H2O

• NaCl

• CO2

• HCl

What must remain unchanged when balancing chemical equations?

• Coefficients

• Subscripts

• Neither coefficients nor subscripts

• Both coefficients and subscripts

To balance the hydrogen atoms in the reaction of hydrogen gas with oxygen gas to form water, what coefficient is placed in front of H2O?

• 1

• 2

• 3

• 4

In the reaction between nitrogen and hydrogen, what is the coefficient placed in front of NH3 to balance the nitrogen atoms?

• 3

• 4

• 2

• 1

What is the purpose of using a chart when balancing chemical equations?

• To identify unbalanced atoms

• To write the chemical formulas

• To visualize the reaction

• To calculate the coefficients