Chemical reaction and equations worksheet-9

Chemical reaction and equations worksheet-9

True or False:

1. BaCl_2(aq) + Al₂(SO₄)_3(aq) → AlCl_3(aq) + BaSO₄↓ is a displacement reaction.

2. The formula of Calcium nitrate is- Ca(NO₃)₂.

3. The formula of Nickel sulphide is- NiS_2.

4. The formula of Aluminium chloride is AlCl₄.

5. Aluminium chloride reacts with magnesium forming magnesium chloride is a displacement reaction.

6. 2NH₃(g) + H₂SO₄(aq) → (NH₄)₂ SO₄(aq). Given reaction  a decomposition reaction

7. Reduction is addition of hydrogen.

8. Cl_2(g) + 2KBr_(aq) → 2KCl_(aq) + Br_2(g). Given reaction is a displacement reaction.

9. Barium chloride reacts with Zinc sulphate forming Zinc chloride and Barium sulphate .It is an example of displacement reaction.

10. AgNO_3(aq) + NaCl_(aq) → NaNO_3(aq) + AgCl_(aq). Given reaction  is a combination reaction.

11. Ca(OH)_2(aq) + CO_2(g) → CaCO_3(s) + H₂O_(l). Given reaction is a combination reaction.

12. The name of Li₃N is - lithium Nitrate.

13. Souring of milk is a Physical change.

14. Dissolving quick lime in water is an endothermic reaction.

15. Respiration is Endothermic process.

16. Baking is a chemical change.

17. Formula of phosphorous penta chloride is PCl_3.

18. Oxidation is loss of oxygen.

19. The arrow pointing downwards ↓ along with a product represents a precipitate.

20. Hydrogen peroxide decomposes in the presence of light forming water and oxygen. This is an electrolytic decomposition.

21. The chemical equation for the formation of calcium oxide from calcium carbonate is 

Answer key:

1. False: It is a double displacement reaction as ions of reactants are exchanged.

2. True:

3. False: It is NiS as the valency of Nickel is 2 and of sulphur is 2.

4. False: It is AlCl₃ as the valency of Aluminium is 3 and Chloride is 1.

5. True :

6. False: It is a combination reaction.

7. True :

8. True :

9. False: It is a double displacement reaction.

BaCl₂ + ZnSO₄ → BaSO₄ + ZnCl₂

10. False: It is a double displacement reaction as chloride ion and Nitrate ion are exchanged.

11. True :

12. False: Its name is lithium nitride. The formula of Lithium Nitrate is LiNO₃

13. False: It is a chemical change as the chemical composition of milk changes.

14. False: It is an exothermic reaction, CaO(s) + H₂O(l) → Ca(OH)₂ + Heat

15. False: Respiration is an exothermic process as energy is released.

16. True:

17.  False: PCl₃ is phosphorous tri chloride. Formula of phosphorous penta chloride is PCl_5.

18. False: It is gain of oxygen.

19. True:

20. False: It is a photolytic decomposition as decomposition takes place in the presence of light.

21. False: CaO + O₂ → CaCO₃