ixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The der has a piston that moves in or out, as necessary, to keep a constant pressure on the mixture of 1 atm. The der is also submerged in a large insulated water bath. (See sketch at right.) n previous experiments, this chemical reaction is known to release 133. kJ of energy. position of the piston is monitored, and it is determined from this data that the piston does 116. kJ of work on the em during the reaction. O exothermic ne reaction exothermic or endothermic? endothermic up s the temperature of the water bath go up or n? down neither in s the piston move in or out? O out neither O in s heat flow into or out of the gas mixture? out neither umuch heat lowe2 Re eure vour anewer hae O.. planation Check 02022 McGraw Hill LLC. All Rights Re O O 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.
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O THERMOCHEMISTRY
Understanding the definitions of heat and work
A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The
cylinder has a piston that moves in or out, as necessary, to keep a constant pressure on the mixture of 1 atm. The
cylinder is also submerged in a large insulated water bath. (See sketch at right.)
From previous experiments, this chemical reaction is known to release 133. kJ of energy.
The position of the piston is monitored, and it is determined from this data that the piston does 116. kJ of work on the
system during the reaction.
O exothermic
Is the reaction exothermic or endothermic?
O endothermic
O up
Does the temperature of the water bath go up or
down?
O down
O neither
O in
Does the piston move in or out?
O out
O neither
O in
Does heat flow into or out of the gas mixture?
O out
O neither
How much heat flows? Re Cire vour anewer hae
n..
Explanation
Check
O2022 McGraw Hill LLC. All Rights Re
MAR
14
W
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![O THERMOCHEMISTRY
Understanding the definitions of heat and work
The pos.... of the piston is monitored, and it is determined from this da
system during the reaction.
exothermic
Is the reaction exothermic or endothermic?
endothermic
up
Does the temperature of the water bath go up or
down?
down
neither
in
Does the piston move in or out?
out
neither
O in
Does heat flow into or out of the gas mixture?
out
neither
How much heat flows? Be sure your answer has
the correct number of significant digits.
Explanation
Check
MAR
14
O O](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fcff9fb3f-ee64-4b11-9054-e611dd1300cc%2F9f20b536-3da8-4920-b600-b7fba8a3c8ea%2Fuakxuw5_processed.jpeg&w=3840&q=75)
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