Consider four 100.0 gram samples of water, each is a separate beaker at 25.0°C. Into each beaker you drop 10.0 g of a different metal that has been heated to 95.0°C. Assuming no heat is lost to the surroundings, which water sample will have the lowest final temperature? (A) water to which you have added aluminum (s=0.89 J/g°C) (B) water to which you have added iron (s=0.45 J/g°C) (C) water to which you have added copper (s=0.20 J/g°C) (D) water to which you have added lead (s=0.14 J/g°C)
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.
Consider four 100.0 gram samples of water, each is a separate beaker at 25.0°C. Into each beaker you drop 10.0 g of a different metal that has been heated to 95.0°C. Assuming no heat is lost to the surroundings, which water sample will have the lowest final temperature?
(A) water to which you have added aluminum (s=0.89 J/g°C)
(B) water to which you have added iron (s=0.45 J/g°C)
(C) water to which you have added copper (s=0.20 J/g°C)
(D) water to which you have added lead (s=0.14 J/g°C)
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