Chemistry, asked by zk5653855, 1 month ago

I Deline 1- Endothermic shop. It is a chemical change that take place with the absorption ofheat endiay. 2 - Law of conservation mass = It States that matter is neither created non destroyed during a chemical reaction . 2 ) Kenitic energy :- It is the energy that the molecules in melden passes. 4- Sublimation = The conversion of galid directly -into VI Live reason When a piece of magnesium is burnt it produces new substance like magnesium oxide hence in is a chemical change . ) The molecules in hquids can move from one positionto another within the same time the time ttyjbggf​

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Answered by manalikaraj2007
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Answer:

In the study of thermochemical processes, things are viewed from the point of view of the system. A chemical reaction or physical change is endothermic if heat is absorbed by the system from the surroundings. In the course of an endothermic process, the system gains heat from the surroundings and so the temperature of the surroundings decreases. The quantity of heat for a process is represented by the letter q . The sign of q for an endothermic process is positive because the system is gaining heat. A chemical reaction or physical change is exothermic if heat is released by the system into the surroundings. Because the surroundings is gaining heat from the system, the temperature of the surroundings increases. The sign of q for an exothermic process is negative because the system is losing heat.

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