Chemical Reactions and Equations (Questions)

📘 Chapter 1 – Chemical Equation

 

  1. What is a chemical reaction?
  2. What is a chemical equation?
  3. What is a skeletal chemical equation?
  4. What is a balanced chemical equation?
  5. Why should a chemical equation be balanced?
  6. What are reactants and products?
  7. What are state symbols in a chemical equation?
  8. What are the steps to write a chemical equation?
  9. How do you balance a chemical equation?
  10. Balance the following equations:
  • Hâ‚‚ + Oâ‚‚ → Hâ‚‚O
  • Fe + Hâ‚‚O → Fe₃Oâ‚„ + Hâ‚‚
  • Zn + HCl → ZnClâ‚‚ + Hâ‚‚
  • Al + Oâ‚‚ → Alâ‚‚O₃
  • KClO₃ → KCl + Oâ‚‚
  1. What is a combination reaction?
  2. Give examples of combination reactions.
  3. What is a decomposition reaction?
  4. What are the types of decomposition reactions?
  5. What is a displacement reaction?
  6. What is a double displacement reaction?
  7. What is a precipitation reaction?
  8. Identify the type of reaction:
  • CaO + Hâ‚‚O → Ca(OH)â‚‚
  • CaCO₃ → CaO + COâ‚‚
  • Zn + CuSOâ‚„ → ZnSOâ‚„ + Cu
  • Naâ‚‚SOâ‚„ + BaClâ‚‚ → BaSOâ‚„ + 2NaCl
  1. What is oxidation?
  2. What is reduction?
  3. What is a redox reaction?
  4. Identify oxidation and reduction in the following reactions:
  • CuO + Hâ‚‚ → Cu + Hâ‚‚O
  • Feâ‚‚O₃ + Al → Alâ‚‚O₃ + Fe
  1. What is corrosion?
  2. What is rusting of iron?
  3. What is rancidity?
  4. How can rancidity be prevented?
  5. Why do iron articles get rusted?
  6. What are the methods to prevent corrosion?
  7. Why should a magnesium ribbon be cleaned before burning?
  8. Why is respiration considered an exothermic reaction?
  9. Why are decomposition reactions called opposite of combination reactions?
  10. Why are displacement reactions also called redox reactions?
  11. Why is balancing of chemical equations important?
  12. What are the implications of oxidation reactions in everyday life?
  13. What is an exothermic reaction?
  14. What is an endothermic reaction?
  15. Why is food kept in refrigerators?
  16. Why are antioxidants added to food?
  17. Why is nitrogen used in food packaging?
  18. Why do we apply paint on iron articles?
  19. Why does copper not react with dilute hydrochloric acid?
  20. Why does silver turn black when exposed to air?
  21. Why does aluminium not corrode easily?
  22. Why is photosynthesis an endothermic reaction?
  23. Why are most decomposition reactions endothermic?
  24. What happens when an iron nail is dipped in copper sulphate solution?
  25. Why is respiration essential for living organisms?
  26. Write the chemical equation for:
  • Burning of magnesium
  • Rusting of iron
  • Electrolysis of water
  • Thermal decomposition of calcium carbonate
  • Reaction of zinc with hydrochloric acid