Understanding the definitions of heat alHU A mixti v products. me 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.) gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous 1 atm pressure piston cylinder From previous experiments, this chemical reaction is known to absorb 125. kJ of energy. water bath The temperature of the water bath is monitored, and it is determined from this data that 270. kJ of heat flows into the system during the reaction. gases 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? out O neither O does work Does the gas mixture do work, or is work done on it? O work is done on it O neither How much work is done on (or by) the gas uro? Be sure your answer has the correct
Understanding the definitions of heat alHU A mixti v products. me 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.) gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous 1 atm pressure piston cylinder From previous experiments, this chemical reaction is known to absorb 125. kJ of energy. water bath The temperature of the water bath is monitored, and it is determined from this data that 270. kJ of heat flows into the system during the reaction. gases 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? out O neither O does work Does the gas mixture do work, or is work done on it? O work is done on it O neither How much work is done on (or by) the gas uro? Be sure your answer has the correct
ChapterU5: Fire: Energy , Thermodynamics, And Oxidation-reduction
Section: Chapter Questions
Problem 4STP
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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.
Question
Transcribed Image Text:O THERMOCH
Understanding the definitions of heat and work
A mixti
products. 1me 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.)
gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous
1 atm pressure
piston
cylinder
From previous experiments, this chemical reaction is known to absorb 125. kJ of energy.
water bath
gases
The temperature of the water bath is monitored, and it is determined from this data that 270. kJ of heat
flows into 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?
down
O neither
in
Does the piston move in or out?
O out
O neither
O does work
Does the gas mixture do work, or is work done
on it?
O work is done on it
O neither
How much work is done on (or by) the gas
mixture? Be sure your answer has the correct
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