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.
![For questions #14-16, you should do your work on a
separate piece of paper and then upload it. You
should use the GUESS Method of solving for each
problem. Also, you have a choice. You can complete
both #14 & #15 which are single step question or do
the extension problem which is a 2 step problem
instead of 14 & 15. You must complete #16.
Equations
Q = mcAT
Q = ±mLf
Q = ±mLv
Values for Water
Clice) = 2.06 J/g°C
C(water) = 4.186 J/g°C
C(steam) = 1.87 J/g°C
Lf (water) = 333 J/g
Lv (water) = 2,260 J/g
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#14. Calculate the energy required to heat 12.5 g of
water from a temperature of 42.2°C to 52.3°C.
#15. How much thermal energy is needed in order to
turn 15.7 grams of water into ice?
Extension: We start with 23.2 grams of ice at 0°C
and add heat to the ice. The ice completely melts and
then is heated until it reaches 45.3°C. How much
energy is added in total?
#16. 12.0 g of a metal absorbs 317 J when it is
heated from 38.2°C to 82.7°C. What is the specific
heat of the metal?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F7e4b4984-0f8e-42e1-b0ec-490b4643ae56%2Fd3d72438-32d2-4479-acf2-53a3107ccd45%2Fsqi038_processed.jpeg&w=3840&q=75)
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