Balancing Chemical Equations Quiz

Which principle states that matter cannot be created or destroyed in a chemical reaction?

• Law of Gravity
• Law of Conservation of Energy
• Law of Conservation of Matter
• Law of Chemical Reactions

In the equation H₂ + O₂ → H₂O, what is the balanced form?

• H₂ + O₂ → H₂O
• 2H₂ + O₂ → 2H₂O
• H₂ + 2O₂ → H₂O
• 2H₂ + 2O₂ → 2H₂O

What is the balanced equation for the rusting of iron, Fe + O₂ → Fe₂O₃?

• Fe + O₂ → Fe₂O₃
• 2Fe + 3O₂ → 2Fe₂O₃
• 4Fe + 3O₂ → 2Fe₂O₃
• 4Fe + O₂ → 2Fe₂O₃

What is the balanced equation for the combustion of methane, CH₄ + O₂ → CO₂ + H₂O?

• CH₄ + O₂ → CO₂ + H₂O
• CH₄ + 2O₂ → CO₂ + 2H₂O
• 2CH₄ + O₂ → 2CO₂ + H₂O
• CH₄ + O₂ → 2CO₂ + H₂O

Which of the following best describes what chemical equations show?

• How atoms dissolve in solutions
• How atoms rearrange during a chemical reaction
• How atoms change their atomic number
• How atoms change their mass

In a balanced chemical equation, what must be true about the number of atoms on each side?

• The left side must have more atoms
• The right side must have more atoms
• Both sides must have an equal number of atoms
• The number of atoms doesn't matter

In the unbalanced equation H₂ + O₂ → H₂O, what is missing to make it balanced?

• A coefficient of 2 before H₂O
• A coefficient of 2 before H₂
• A coefficient of 2 before O₂
• Coefficients of 2 before H₂ and H₂O

What particles are found in the nucleus of an atom?

• Protons and electrons
• Neutrons and electrons
• Protons and neutrons
• Electrons only

Why do electrons in higher energy levels have more energy?

• They are closer to the nucleus
• They are farther from the nucleus
• They have more mass
• They are positively charged

What determines an atom's bonding behavior?

• Number of protons
• Number of neutrons
• Number of valence electrons
• Number of energy levels