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\nWhat Are Reversible Reactions? | Reactions | Chemistry | FuseSchool\n

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\nLearn about reversible reactions. Find out where you can find them and what they actually are. In this lesson, we will learn about reversible reactions. When we fry an egg, it is impossible to 'unfry' it. A lot of reactions work in the...\nLearn about reversible reactions. Find out where you can find them and what they actually are. In this lesson, we will learn about reversible reactions. When we fry an egg, it is impossible to 'unfry' it. A lot of reactions work in the same way, once it is done, it is irreversible. A good example is the combustion of magnesium to form magnesium oxide. Reversible reactions are reactions where formed products can revert, or go back, to their original reactants. Since the reaction can proceed in either direction, we use this reaction arrow to represent reversibility. An example of a reversible reaction is the thermal decomposition of ammonium chloride to form ammonia and hydrogen chloride. Place ammonium chloride in a boiling tube and heat using a Bunsen burner. Ensure that this is conducted in a fume cupboard as ammonia and hydrogen chloride are both corrosive gases. If we hold red litmus paper at the mouth of the boiling tube, it turns blue, which confirms the presence of ammonia. Blue litmus paper turns red, which confirms the presence of hydrogen chloride. Remove the boiling tube from the heat and let cool. Have a look near the mouth of the boiling tube. You will see that there are white crystals, these are ammonium chloride crystals. So what has happened here? Ammonium chloride has thermally decomposed to ammonia and hydrogen chloride. The formed ammonia and hydrogen chloride have reacted to produce ammonium chloride. Hence, ammonium chloride ammonia + hydrogen chloride. Therefore, this is a reversible reaction. Why is the thermal decomposition of ammonium chloride sometimes incorrectly called a 'sublimation reaction'? When a substance goes from the solid phase to a gas phase, it is said that it has sublimed. This phase change is not a 'reaction', as the substance itself has not changed. In our example, solid ammonium chloride did not form gaseous ammonium chloride, but rather, it decomposed under heat to form ammonia and hydrogen chloride. Therefore, it is not a 'sublimation reaction'. At Fuse School, teachers and animators come together to make fun & easy-to-understand videos in Chemistry, Biology, Physics, Maths & ICT. Our OER are available free of charge to anyone. Make sure to subscribe - we are going to create 3000 more! The Fuse School is currently running the Chemistry Journey project - a Chemistry Education project by The Fuse School sponsored by Fuse. These videos can be used in a flipped classroom model or as a revision aid. Find our other Chemistry videos here Be sure to follow our social media for the latest videos and information! Twitter Facebook Google+ Youtube Email: info@fuseschool.org Website: www.fuseschool.org This video is distributed under a Creative Commons License: Attribution-NonCommercial-NoDerivs CC BY-NC-ND\n
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2013
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