Calculate the relative atomic mass of naturally occurring consist of 77.5% cl model 35-22 2.5% cl - 37

answer: you could do some invislibe ink.

explanation: i will tell you how to if u answer my question.

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

let that person have a turn to speak : )