5. Solid ammonium chloride is added to water in a beaker and dissolves. The beaker becomes cold to the touch. A. MAke an appropriate choice of system and surroundings and describe it unambiguously. B. Explai why you chose the system and surroundings you did.
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.
5. Solid ammonium chloride is added to water in a beaker and dissolves. The beaker becomes cold to the touch.
A. MAke an appropriate choice of system and surroundings and describe it unambiguously.
B. Explai why you chose the system and surroundings you did.
9. A diamond weighing 310 mg requires 2.38 J to raise its temperature from 23.4°C to 38.7°C.
A. Calculate the specific heat.
B. Calculate the molar heat capacity of diamond
C. Is the specific heat capacity of diamond the same as the specific heat capacity of carbon in the form of graphite? Give on reason why you might expect them to be the same and one reason why you might expect them to be different.
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