have you ever wondered how a chemical reaction throws a temper tantrum and everything ends up a mess today we're going to be diving into just that we're going to be talking about Laser's principle or as I like to call it the drama queen of chemistry let's get started so let's dive into Lea's principle this principle tells us that if we apply stress to a system at equilibrium the system will adjust itself to counter the stress and restore balance to understand this better let's take a closer look at a few examples onep of stress that we can introduce is changing the concentration of any compound involved in a reaction for instance if we add more of a reactant this adjusts the equilibrium to counter this what happens is is the forward reaction is going to speed up to convert the added reactants into products reestablishing equilibrium in this case we would say that equilibrium has shifted to the right conversely if we add more products the equilibrium is going to shift to the left another example of stress is when we remove one of the components as you can see from our example we have an equal amount of reactants and an equal amount of products however if we remove a couple of those reactants what's going to happen is the system is going to respond by Shifting the reaction to produce more of that missing component aiming to restore balance these adjustments illustrate how Le chat's principle Works to keep the system at equilibrium even when we introduce changes another way that we can stress on an equilibrium is by changing the temperature to understand how temperature changes affect equilibrium we first need to know if a reaction is exothermic or endothermic this will tell us if a reaction releases or absorbs energy represented by Delta H the change in enthalpy if Delta H is negative the reaction is exothermic meaning that it releases energy in this case we can think of heat as a product of the reaction if Delta H is POS positive then the reaction is endothermic meaning it absorbs energy so he acts more like a reactant here something the reaction needs to proceed with this thermochemical data in mind we can treat heat as another player in the reaction if we increase the temperature we essentially are adding more heat to the mix essentially what's going to happen is the reaction is going to shift to the opposite side to use up that extra heat and relieve the stress if we cool things down removing the heat the reaction is going to shift towards the side that produces heat to restore the balance so in essence temperature changes can tip the equilibrium in One Direction or the other and the system will adjust by shifting to keep things balanced just like adding or moving reactant or product the third type of stress we can look at is changing the volume or pressure imagine we have an equilibrium involving gases inside of a beaker but what happens if we reduce the volume of the beaker by pushing down on the plunger according to Bo's law decreasing the volume increases pressure because the particles have less space and they Collide more often with the container sides now if there's a difference in the number of particles or moles on each side of the equilibrium the system will shift towards the side with fewer particles to reduce some of that extra pressure in an equilibrium involving dionic molecules on the left side and two separate atoms on the right side the right side with those two atoms technically have twice as many moles by shifting that equilibrium to the left it's going to leave the particles to combine resulting in fewer total particles which helps lower the pressure in contrast if we increase the volume lowering the pressure the equilibrium will shift towards the side with more particles to regain some of that lost pressure and balance things out I hope that this information was helpful in understanding everything you're going to need to know when it comes to this Principle as always if you have any additional questions make sure that you leave them down below I love answering your questions head rers shore.com there's a ton of additional resources order to help you Ace those science exams and as always I'm going to catch you in the next video bye