9th Class Chemistry Notes Chapter 5 Long Questions PDF - Energetics

Descriptive questions for Unit 5, Energetics, of the new 9th class Chemistry course. Each question carries its textbook exercise reference, and the answers are written at the length an annual paper question expects, with the working shown where a calculation is involved.

• Class: 9th (Matric Part 1)
• Subject: Chemistry, English Medium
• Unit 5: Energetics
• Question type: Descriptive, long answer questions
• Answer style: definitions, worked calculations and comparison tables under clear sub-headings
• Syllabus: New PECTAA syllabus for Punjab Boards, sessions 2025-26 and 2026-27
• Format: PDF, with the textbook figures and structures kept in

Ground covered by these descriptive answers:

• Finding the enthalpy change of a reaction from bond dissociation energies
• The worked calculation for nitrogen plus oxygen giving nitric oxide
• Heat against enthalpy, compared by definition, process, measurement and unit
• Bond breaking as an energy-absorbing step and bond forming as an energy-releasing one
• Exothermic and endothermic changes shown on energy diagrams

Get the PDF from taleem360.com and use it alongside your textbook while you prepare this unit.