Why is it necessary to run tlc in a closed container and to have the interior vapor saturated with the solvent?.

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explanation:

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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.

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1.43 x 10^-11 j the guy commented the awnser just making sure u see it .

it should have an internal chamber and two thermometers sticking out of the top. the internal chamber will also be closed off from the outside.