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in this video weamp;#39;re going to focus on chemistry problems related to internal energy heat and work so letamp;#39;s start with this one calculate the change in the internal energy of a system if 300 joules of heat energy is absorbed by the system and if 400 joules of work is done on the system now i donamp;#39;t know if you saw a previous video that i created on the first law of thermodynamics but if you havenamp;#39;t in chemistry delta u the change in internal energy is equal to q plus w in physics itamp;#39;s q minus w now q is positive whenever heat is absorbed by the system so thatamp;#39;s during an endothermic process q is negative whenever heat is released by the system so thatamp;#39;s during an exothermic process w is positive whenever work is done on a system so the internal energy of the system will go up and w is negative whenever work is done by the system so this would decrease the internal energy of the system so those are a few things to keep in mind throug
