Pondering the concept of specific heat while walking home from chemistry class, you find an old penny on the ground and begin to wonder what the specific heat of copper is. You rush home and put 5.00 g of water at 18.00 °C in a styrofoam cup. You heat the 2.45 g penny to 50.00 °C and drop it in the water. The final temperature of the metal and water is 19.38 °C. Assuming the penny is pure copper (which modern pennies are not), what is the specific heat of copper? The specific heat of water is 4.18 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.
17D.4. Pondering the concept of
specific heat while walking home
from chemistry class, you find an old
penny on the ground and begin to
wonder what the specific heat of
copper is. You rush home and put
5.00 g of water at 18.00 °C in a
styrofoam cup. You heat the 2.45 g
penny to 50.00 °C and drop it in the
water. The final temperature of the
metal and water is 19.38 °C.
Assuming the penny is pure copper
(which modern pennies are not),
what is the specific heat of copper?
The specific heat of water is 4.18
J/g·°C.
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