Question

a student noted down the following precautions for the experiment "to varify the law of conservation of mass in a chemical reation"
1 mixing of two solutions should be done quickly
2. chemical reation should be exothermic
which precaution needs modification

Answer 1

2 answer is correct. The chemical reactions should be exothermic which precaution needs modifications

Answer 2

hola there....
2) chemical reaction schold be exothermic