Phase Transition | MCQs

Explanation

Explanation

Evaporation is the process where liquid turns into gas at temperatures below its boiling point.

It occurs at the surface of the liquid.

It is influenced by factors like temperature and surface area.

Explanation

The melting point of ice at normal atmospheric pressure is 0 °C (zero degrees Celsius).

Key Points:

• 0 K (zero Kelvin) is equivalent to -273.15 °C, which is absolute zero, the lowest possible temperature.
• 100 °C is the boiling point of water at normal atmospheric pressure.

Explanation

Heat of vaporization is the amount of heat energy required to convert a substance from its liquid state to its gaseous state, without changing its temperature.

This energy is used to break the intermolecular forces between the molecules, allowing them to escape into the gas phase.

Explanation

• Sublimation is the transition of a substance from the solid to the gas phase without going through the liquid phase.
• Glucose and Sodium Chloride do not sublime, as they require a liquid phase transition before turning into a gas.

Here are the some solid sublime material:

• Iodine
• Camphor or Dry ice

Explanation

• Gases can be converted into liquids by cooling, a process known as condensation.
• As the temperature decreases, the particles of the gas slow down and come together, forming a liquid.

Explanation

Tin has the lowest melting point (~232°C) among.

• Zinc (~419°C)
• Gold (~1064°C)
• Lead (~327°C)

Explanation

Latent heat of vaporization is the energy required to change a liquid into a gas (or vice versa) without changing its temperature.

Latent heat of fusion is the energy required to change a solid into a liquid (or vice versa) without changing its temperature.

Explanation

Latent heat of fusion is the energy required to change a solid into a liquid (or vice versa) without changing its temperature. 

Latent heat of vaporization is the energy required to change a liquid into a gas (or vice versa) without changing its temperature.

Explanation

The boiling point is the temperature at which a pure liquid changes state from liquid to gas at standard atmospheric pressure.

Key Points:

• The melting point is the temperature at which a solid changes state to a liquid.
• The freezing point is the temperature at which a liquid changes state to a solid.