Which statement is true of the following reaction?

upper h subscript 2 plus upper o subscript 2 right arrow upper 2 h superscript plus, plus upper o superscript 2 minus.
it is balanced for charge and for number of atoms.
it is not balanced for charge or for number of atoms.
it is not balanced for charge but is balanced for number of atoms.
it is balanced for charge but is not balanced for number of atoms.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e