First slide

Internal energy and internal energy change

Question

Correct statements about internal energy are
A) The absolute value of internal energy cannot be determined
B) The internal energy of one mole of a substance is same at any temperature
C) The measurement of heat change during a reaction by bomb calorimeter is equal to internal energy change
D) Internal energy is an extensive propriety

Easy

A

A, B and C only
B

A, C and D only
C

B, C and D only
D

A, B and D only

Solution

A--correct, B--false…..Internal energy is a function of temperature;
C…correct….bomb calorimeter is a closed vessel therefore heat change in a process is $∆ E$ ;
D…correct….'E' or ‘U’ depends on quantity of substance;

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