Which quantity can be calculated using the equation E = mc?? O the energy needed to split an atom into separate protons, neutrons, and electrons
O the energy needed to split the nucleus into separate protons and neutrons
O the energy needed to remove an electron from an atom
O the energy needed to add an electron to an atom

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

i think its 5049.

i hope this !