Why is respiration considered an exothermic reaction?
Answer framework: Write the glucose oxidation equation, mention energy release, and connect it to cellular respiration.
All Class 10 Science notes
Chapter 1 • Chemistry
Chemical Reactions and Equations
Recognise chemical changes, write and balance equations, classify reactions, and connect oxidation with corrosion and rancidity.
Core concepts checklist
Writing word, skeletal and balanced chemical equations
Combination, decomposition, displacement and double-displacement reactions
Exothermic and endothermic reactions
Oxidation, reduction and redox reactions
Corrosion, rancidity and their prevention
Formula & fact bank
2Mg + O₂ → 2MgO
Fe + CuSO₄ → FeSO₄ + Cu
AgNO₃ + NaCl → AgCl↓ + NaNO₃
CuO + H₂ → Cu + H₂O
Diagrams to practise
Draw with pencil, use straight label lines, add arrows and write a precise caption.
- 1Electrolysis of water setup
- 2Iron nail in copper sulphate activity
- 3Balancing-equation flowchart
CBSE examiner focus
- Always balance atoms, never change a compound's formula
- Add state symbols and reaction conditions when asked
- State visible observations: colour, gas, precipitate or temperature change
Board-style practice
Classify five common reactions with one balanced equation each.
Answer framework: Use combination, decomposition, displacement, double displacement and redox, with correct conditions and observations.
Turn revision into marks with Eduvista
Use this guide for recall, then practise timed answers and get feedback. Eduvista combines visual notes, NCERT clarity, board-pattern tests and personal doubt support.