Answer:
physical change
Explanation:
it it was just heated up and change into a different form
The heat from your hand would be absorbed by the (assumed) colder flask, since an endothermic reaction means that the reaction requires an absorption of heat as opposed to an exothermic reaction, which releases heat.
Answer:
B
Explanation:
Because B is stable square both sides are equal
Con: less energy
pro : helping the society