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 249. kJ of energy. The temperature of the water bath is monitored, and it is determined from this data that 160. kJ of heat flows out of the system during the reaction. 4 Is the reaction exothermic or endothermic? Does the temperature of the water bath go up or down? Does the piston move in or out? Does the gas mixture do work, or is work done on it? How much work is done on (or by) the gas mixture? Be sure your answer has the correct number of significant digits. O exothermic O endothermic O up Odown Oneither O in O out Oneither O does work O work is done on it Oneither x10 X 5 1 atm pressure gases piston cylinder water
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.
![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 249. kJ of energy.
The temperature of the water bath is monitored, and it is determined from this data that 160. kJ of heat flows out of the
system during the reaction.
Is the reaction exothermic or endothermic?
Does the temperature of the water bath go up or
down?
Does the piston move in or out?
Does the gas mixture do work, or is work done
on it?
How much work is done on (or by) the gas
mixture? Be sure your answer has the correct.
number of significant digits.
Explanation
Check
O exothermic
O endothermic
Oup
O down
O neither
O in
O out
O neither
O does work
O work is done on it
Oneither
x10
X
S
MacBook Air
1 atm pressure
gases
piston
cylinder
water bath
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Given : energy released by the reaction, ∆U = -249 KJ where negative sign indicates energy is released.
Heat flows out of the system, Q = -160 KJ where negative sign indicates heat is released from the reaction system.
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