Oxidation Numbers & Redox Equations — Drills · Grade 11 Science
Chapter: Redox, Cells & Nuclear ChemistryWhat these drills covers
By the end of Oxidation Numbers & Redox Equations you should be able to:
- I can assign oxidation numbers and identify oxidizing and reducing agents.
- I can combine half-reactions while conserving atoms, charge, and electrons.
2 questions, numeric and written answer, each with a worked explanation.
Vocabulary used: oxidation, reduction, oxidizing agent.
Problem 1
Find nitrogen oxidation number in NO₃⁻ with O=−2.
Hints
Write the relationship first; substitute with consistent units.
Answer and explanation
5
x−6=−1, x=+5.
Problem 2
Identify the reducing agent in Zn+Cu²⁺→Zn²⁺+Cu.
Answer and explanation
Zn donates electrons and is oxidized, so it is the reducing agent.
Response criteria
- State a scientifically accurate conclusion.
- Show the calculation or mechanism that supports it.
- Include units, conditions, or limits where relevant.