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Thermodynamics Practice Test: Heat, Work, and Energy Change

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Thermodynamics Practice Test: Heat, Work, and Energy Change

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Questions and Answers

What is the unit of ΔEsys?

Kelvin

Watt

Joules (correct)

Coulomb

What happens to the internal energy of a system when heat is added to it?

It increases (correct)

It remains the same

It becomes zero

It decreases

When the system does work, what happens to its energy?

It becomes zero

It loses energy (correct)

It remains the same

It gains energy

What is the significance of positive q?

System absorbs heat from surroundings (D) Signup and view all the answers

What happens to the internal energy of a system when it releases heat to its surroundings?

It decreases (B) Signup and view all the answers

What is the direction of energy flow when w is negative?

Energy flows out of the system (A) Signup and view all the answers

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 (C) Signup and view all the answers

What happens to the energy utilized to do work when it is not used?

It is converted into heat (B) Signup and view all the answers

What is the significance of the convertibility of different forms of energy into heat?

It allows for the measurement of energy (C) Signup and view all the answers

What is the result of a gas expanding and doing 72 J of work?

It absorbs 48 J of heat (B) Signup and view all the answers

What is the condition under which most chemical reactions occur in laboratories and living systems?

Under constant pressure (C) Signup and view all the answers

What is the sign of ΔEsys in an endothermic reaction?

Positive (D) Signup and view all the answers

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. (A) Signup and view all the answers

Which form of energy refers to the force used to transfer energy between a system and its surroundings?

Work (B) Signup and view all the answers

What is the Enthalpy of the Reaction primarily concerned with?

Describing the total chemical energy of a system. (D) Signup and view all the answers

What is the role of work and heat in allowing systems to exchange energy?

Both work and heat are necessary for energy exchange. (C) Signup and view all the answers

What is the key concept behind the Hess Law in calculating enthalpy changes of reactions?

Enthalpy change is independent of the pathway taken. (C) Signup and view all the answers

Which energy form can be transferred between two bodies at different temperatures?

Heat energy (B) Signup and view all the answers