Question

which one of the following is true for all chemical reactions 1)THERE is a charge in volume 2)heat is evolved 3)chemicals bonds are broken or formed 4)there is a change in a mass

Answer 1

3) is true for all cheamical reaction

Answer 2

Chemical reactions are one of the most common scientific phenomenon in the whole world.

There are many types of chemical reactions which have different characteristics.

But the chemical bond break of chemical bond formation is the common factor of every possible chemical reactions in the world.

That's why option 3 is the correct answer.