Is the reaction in a 'glow-stick' reversible or irreversible?

1 answer:

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Glow sticks are sold with a solution of oxalate and dye being in one vessel and a solution of hydrogen peroxide contained in another vessel. By bending the sticks, the inner vessel breaks. This allows the two solutions to mix and react with each other, leading to chemiluminescence. Since the reaction is not reversible, the glow sticks can only be used once.

https://en.chem-station.com/blog/2014/08/how-glow-sticks-are-made.html

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Choose two of the following scientists: Anton Lavoisier, John Dalton, JJ Thomson, Robert Millikan, Ernest Rutherford, James Chad

OverLord2011 [107]

Ernest Rutherford

J. J Thomson

Explanation:

<u>Ernest Rutherford</u>

In 1911, Ernest Rutherford, a New Zealand chemist performed the gold foil experiment where he gave the modelling of the atom a boost.

Experiment

In his experiment, he bombarded a thin gold foil with alpha particles generated from a radioactive source. He found that most of the alpha particles passed through the gold foil while a few of them were deflected back.

Discovery and reflection on the atomic theory

To account for his observation, Rutherford suggested an atomic model in which an atom has small positively charged center where nearly all the mass is concentrated.

<u>J. J Thomson</u>

Experiment

In 1897 J.J Thomson performed experiments using the gas discharge tube that led to the discovery of the electrons. He called them cathode rays because they originate from the cathode and exits at the anode.

Discovery and reflection on the atomic theory

From his experiment on the gas discharge tube, Thomson was able determine the properties of cathode rays some of which are: