Thermodynamic Properties | MCQs

Explanation

Enthalpy is a form of energy, so its SI unit is Joule (J).

1 calorie = 4.184 joules.

But Joule is the standard unit in thermodynamics.

Explanation

The constant (often represented as 'k' or 'A') in Charles's Law is dependent on the amount of gas (number of moles) and the pressure.

It essentially represents the proportionality between volume and temperature when pressure is kept constant. 

Explanation

The degrees of freedom refer to the number of independent ways a gas molecule can store energy.

For a monoatomic gas (e.g., noble gases like helium, neon, argon):

• It has only translational motion along the x, y, and z axes.
• There are no rotational or vibrational degrees of freedom.

Thus, the total degrees of freedom for a monoatomic gas is 3 (one for each spatial direction: x, y, and z).

Explanation

The vapour pressure of a liquid varies with its temperature in a directly proportional relationship. 

The other factors that affect vapor pressure are humidity and surface area.

It is independent of surface area and humidity

Additional information:

As the temperature of a liquid increases its vapor pressure also increases.

Conversely, vapor pressure decreases as the temperature decreases.

Thus with a decrease in vapor pressure-temperature will not rise.

On the other hand with a rise in temperature density, surface tension, and viscosity all decrease.