question_answer

  Two students of class IX, Kaveri and Nalini, were asked to take 5.3 g of sodium carbonate and 6 g of ethanoic acid to make 2.2 g of carbon dioxide, 0.9 g of water and 8.2 g of sodium ethanoate. Kaveri followed the instructions but Nalini took the chemicals without measuring their amounts. Read the above passage and answer the following questions (a) Whose activity do you think will be in agreement with the law of conservation of mass? (b) State the law of conservation of mass. (c) Whose method do you like and why?

Answer:

    (a) Kaveri                                    (b) Mass can neither be created nor be destroyed in a chemical reaction.                          (c) I liked the method of Kaveri, as she performed the experiment precisely,