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Chemistry Chapter on Enthalpy

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Questions and Answers

What is the primary condition under which most chemical reactions are conducted in the laboratory?

Constant pressure (correct)

Variable pressure

Constant temperature

Constant volume

How is the change in internal energy (ΔE) defined during reactions conducted at constant volume?

It is the heat change without any external work being performed. (correct)

It is the work done by the system on the surroundings.

It is equivalent to the heat change at constant pressure.

It measures the total energy absorbed and released during a reaction.

What new term has been introduced to study heat changes for reactions at constant pressure and constant temperature?

Thermal energy

Internal energy

Enthalpy (correct)

Heat capacity

What equation represents the definition of enthalpy?

$H = E + PV$ (B) Signup and view all the answers

What is the main difference between measurements taken at constant volume and constant pressure?

The changes observed in energy are different. (C) Signup and view all the answers

Which statement correctly describes how chemists handle heat changes in reactions?

Chemists have classified heat changes under the term Enthalpy for constant pressure reactions. (B) Signup and view all the answers

Why can't the absolute value of enthalpy be measured?

Enthalpy is a state function and depends only on the state of the system. (B) Signup and view all the answers

What does the change in enthalpy ($ riangle H$) indicate?

The difference between the enthalpy of products and reactants. (A) Signup and view all the answers

Which of the following is true about enthalpy as a state function?

It depends on the initial and final states of the system. (D) Signup and view all the answers

Which variables are involved in the enthalpy definition equation?

Pressure and internal energy (D) Signup and view all the answers