Please help! If you have a 1000 carbon atoms and pulled out one atom ,what would it’s mass likely be?Also, for hydrogen which isotope is closest to the mass recorded on the periodic table? Why do think this based data for hydrogen?

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

he would use the colour black