Chemical reaction and equations worksheet-2

Chemical reaction and equations worksheet-2

 

Fill in the Blanks:

  1. ________ is an antioxidant commonly used to prevent rancidity of food.

  2. Food scraps are turned into compost in a compost pile is a _______ change.

  3. Clotting of blood using alum is a _______ change.

  4. Latent finger prints (invisible to eye) are made visible by_______ change.

  5. In the stomach proteins are digested. It is a _______ change.

  6. Rancidity of food is _______ change.

  7. _______ occurs due to aerial oxidation of fats and oils in foods marked by unpleasant smell and taste.

  8. N2 + H2 → NH3 The balanced equation has_______ molecules of ammonia.

  9. SO2 + H2S → 2H2O + 3S _______ is oxidized.

  10. H2(g) + CuO(s) → Cu(s) + H2O(l) _______ is oxidized.

  11. Oxidation is_______ of electron.

  12. In Redox reactions ________occurs.

  13. Oxidizing agent is one which_________ electrons.

  14. The name of HCO3 is_______.

  15. The name of Cr3+ is _______.

  16. The name of PO43– are _______.

  17. Podium hydroxide + _______ → Potassium nitrate + Water

  18. Iron + Copper sulphate → Ferrous sulphate + ______

  19. One mole Na2SO­4 contains _______ atoms of Sodium, ______ atoms of Sulphur and _____ atoms of Oxygen.

          Write as three digit number.

  1. Copper vessels when exposed to air and water get tarnished by acquiring a thin layer of _____.

 

Answer keys:

  1. Butylated Hydroxy-Anisole Or Butylated Hydroxy –Toluene Or BHA, BHT

  1. Chemical or Chemical change

  2. Chemical or Chemical change

  3. Chemical or Chemical change

  4. Chemical or Chemical change

  5. Chemical or Chemical change

  6. Rancidity

  7. 2

  8. Hydrogen-sulphide,

  9. Hydrogen,

  10. Loss

  11. Both oxidation and reduction occurs. Or Both reduction and oxidation occurs.

  12. Gains

  13. bicarbonate ion

  14. chromium ion

  15. phosphate ion

  16. Nitric acid

  17. Cu Or Copper

  18. 214

  19. Basic carbonate