The first step in the synthesis of alum is to react aluminum with potassium hydroxide. Why does this need to be heated? to speed up the reaction, but it doesn't need to be heated the whole time. The reaction is exothermic and will eventually produce enough heat to progress on its own. to make the reaction happen. It must be heated the whole time or the reaction will stop. to slow the reaction down. It will proceed too quickly without heat. It doesn't need heating. It might catch fire if it is heated.
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
The first step in the synthesis of alum is to react aluminum with potassium hydroxide. Why does this need to be heated?
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to make the reaction happen. It must be heated the whole time or the reaction will stop. |
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to slow the reaction down. It will proceed too quickly without heat. |
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It doesn't need heating. It might catch fire if it is heated. |
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