Exit Ticket: Balancing chemical equations

Exit Ticket · Grade 11 · Chemistry

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Short Answer Questions

• Q1. Balance the following chemical equation and explain each step: H₂ + O₂ → H₂O

• Q2. A student writes the balanced equation for the combustion of methane as CH₄ + O₂ → CO₂ + H₂O. Identify the error and write the correctly balanced equation.

Reflection

• What part of balancing chemical equations do you still find confusing or challenging, and what strategy might help you improve?

Multiple Choice

• Q1. Which of the following is the correctly balanced equation for the reaction between hydrogen and nitrogen to form ammonia?

  • H₂ + N₂ → NH₃
  • 3H₂ + N₂ → 2NH₃
  • 2H₂ + N₂ → 2NH₃
  • 3H₂ + 2N₂ → 2NH₃

  Answer: 3H₂ + N₂ → 2NH₃

• Q2. Why is it incorrect to balance a chemical equation by changing the subscripts in a chemical formula?

  • It makes the equation harder to read
  • It changes the identity of the substances involved
  • It violates the law of conservation of energy
  • Subscripts can only be changed by the teacher

  Answer: It changes the identity of the substances involved

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