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# Thermodynamics: Specific Heat Capacity and Enthalpy

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### What is Cv related to in thermodynamics?

• Changes in external energy
• Changes in entropy
• Changes in pressure
• Changes in internal energy (correct)
• ### What is C related to in thermodynamics?

• Changes in volume
• Changes in internal energy
• Changes in enthalpy (correct)
• Changes in entropy
• ### What is the unit of measurement for specific heat capacity?

• J/kg.K
• kJ/kg.K (correct)
• J/kg°C
• kJ/kg°C
• ### Is the unit of measurement for specific heat capacity the same in Celsius and Kelvin?

<p>Yes, because they are interchangeable</p> Signup and view all the answers

### What is the significance of specific heat capacity in thermodynamics?

<p>It determines the amount of energy required to change the temperature</p> Signup and view all the answers

### What is the unit of the term 'ds' in the given equation?

<p>Joules per kilogram kelvin</p> Signup and view all the answers

### What is the characteristic of a quasi-equilibrium process?

<p>The system remains nearly in equilibrium at all times</p> Signup and view all the answers

### What is the relation between 'P' and 'PdV' in the given equation?

<p>P is proportional to PdV</p> Signup and view all the answers

### What is the unit of 'W' in the equation?

<p>Joules per second</p> Signup and view all the answers

### What does the equation 'SWF ds = PA ds = PdV' represent?

<p>The energy balance of a system</p> Signup and view all the answers

### What is a substance with a fixed chemical composition throughout?

<p>Pure substance</p> Signup and view all the answers

### Why is air considered a pure substance despite being a mixture of several gases?

<p>Because it has a fixed chemical composition</p> Signup and view all the answers

### What is a saturated vapor?

<p>A vapor that is about to condense</p> Signup and view all the answers

### What happens to the temperature of water during the phase-change process between states 1 and 5?

<p>The temperature remains constant at 100°C</p> Signup and view all the answers

### What occurs when the entire process between states 1 and 5 is reversed by cooling the water while maintaining the pressure constant?

<p>The water will go back to state 1, retracing the same path</p> Signup and view all the answers

### What is true about the amount of heat released during the reversed process?

<p>The amount of heat released exactly matches the amount of heat added</p> Signup and view all the answers

### What is the physical significance of the area under the process curve on a P-V diagram for a closed system?

<p>It is equal in magnitude to the work done during a quasi-equilibrium expansion or compression process</p> Signup and view all the answers

### What is the mathematical relationship between the area of the process curve and the work done on a closed system?

<p>Area = PdV</p> Signup and view all the answers

### What is the condition for a process to occur in a closed system, as depicted on a P-V diagram?

<p>The process must be quasi-equilibrium</p> Signup and view all the answers

### Which of the following is a correct unit for the area under the process curve on a P-V diagram?

<p>Joules</p> Signup and view all the answers

### What is the relationship between the path 'dA' and the pressure 'P' and volume change 'dV'?

<p>dA = PdV</p> Signup and view all the answers

### What is the relationship between internal energy and temperature for an ideal gas?

<p>u is a function of T</p> Signup and view all the answers

### What is the expression for enthalpy h in terms of internal energy u and gas constant R?

<p>h = u + RT</p> Signup and view all the answers

### What is the relationship between the change in internal energy and the specific heat capacity at constant volume?

<p>du = c₁ dT</p> Signup and view all the answers

### What is the relationship between the change in enthalpy and the specific heat capacity?

<p>dh = c dT</p> Signup and view all the answers

### What was the purpose of the experimental apparatus used by Joule, as shown in the schematic?

<p>To measure the mechanical equivalent of heat</p> Signup and view all the answers

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