Question

Question 4 a) Show that the chemical reaction in which magnesium burns with

dazzling white light to form magnesium oxide is in accordance with law of

conservation of mass. (Mg= 24 , O=16) [3]

b) State law of conservation of mass. [2]

c) Show systematically how the following separation can be carried out- [2]

i) Sulphur + Iodine + Common salt.

ii) Common salt + Water + Sawdust.

d) Complete the following with suitable option [3]

i) Cutting of fruits ………. ( physical change \ Chemical change)

ii) Respiration of cow ……….( physical change\ Chemical change)

iii) Making butter from cream……..(physical change \ chemical change)​

Answer 1

Answer:

b. law of conservation of mass states that - Matter can neither be changed nor be destroyed in a chemical reaction