18 Questions
What is the unit of ΔEsys?
Joules
What happens to the internal energy of a system when heat is added to it?
It increases
When the system does work, what happens to its energy?
It loses energy
What is the significance of positive q?
System absorbs heat from surroundings
What happens to the internal energy of a system when it releases heat to its surroundings?
It decreases
What is the direction of energy flow when w is negative?
Energy flows out of the system
What is the result of the energy released by a gas as 84 J of work was done to compress it?
35 J of heat is released
What happens to the energy utilized to do work when it is not used?
It is converted into heat
What is the significance of the convertibility of different forms of energy into heat?
It allows for the measurement of energy
What is the result of a gas expanding and doing 72 J of work?
It absorbs 48 J of heat
What is the condition under which most chemical reactions occur in laboratories and living systems?
Under constant pressure
What is the sign of ΔEsys in an endothermic reaction?
Positive
Which statement best defines the First Law of Thermodynamics?
It states that energy can neither be created nor destroyed, only converted from one form to another.
Which form of energy refers to the force used to transfer energy between a system and its surroundings?
Work
What is the Enthalpy of the Reaction primarily concerned with?
Describing the total chemical energy of a system.
What is the role of work and heat in allowing systems to exchange energy?
Both work and heat are necessary for energy exchange.
What is the key concept behind the Hess Law in calculating enthalpy changes of reactions?
Enthalpy change is independent of the pathway taken.
Which energy form can be transferred between two bodies at different temperatures?
Heat energy
Test your understanding of heat, work, energy change, and system thermodynamics with this practice quiz. Calculate the energy change for different scenarios involving heat transfer and work done on or by a system. Identify whether the processes are endothermic or exothermic.
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