Vapor Pressure in Physics - RCSI Medical University of Bahrain

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What is the term used to describe the temperature at which the vapor pressure is equal to atmospheric pressure?

Freezing Point

Boiling Point (correct)

Melting Point

Condensation Point

Which phase change process requires the supply of Latent Heat of Vaporization?

Melting

Sublimation

Condensation (correct)

Freezing

At equilibrium, in terms of vapor molecules, what happens at the surface of the liquid?

All molecules evaporate and none re-enter

More vapor molecules enter the liquid than evaporate

No molecules evaporate or re-enter

Equal number of molecules evaporate and re-enter (correct)

What is the term for the heat energy required to change a substance from solid to liquid at the same temperature?

Latent Heat of Fusion Signup and view all the answers

Visible evaporation throughout the bulk of a liquid is observed at which point?

Boiling Point Signup and view all the answers

For a liquid and vapor to coexist in equilibrium at a given pressure, what temperature condition must be met?

Equal vapor pressure and boiling point Signup and view all the answers

What is the specific latent heat of fusion?

Energy required to convert 1 kg of solid to 1 kg of liquid at the same temperature Signup and view all the answers

Which material has the highest specific latent heat of vaporization?

Copper Signup and view all the answers

What happens when a molecule of water (sweat) evaporates from the skin?

It releases heat energy Signup and view all the answers

Why does it take more energy to evaporate a substance than to melt it?

Melting requires breaking intermolecular bonds, while evaporation involves overcoming intermolecular forces and changing phase Signup and view all the answers

In the applications described, why do birds require twice as much heat to melt snow from solid to liquid at 0°C than to heat it from 0°C to their body temperature of 40°C?

Due to the higher specific latent heat of fusion compared to specific latent heat of vaporization Signup and view all the answers

How does the temperature at which a phase change occurs vary with absolute pressure according to the provided information?

Temperature at which phase change occurs increases with an increase in absolute pressure Signup and view all the answers

What is the amount of energy required to change 1kg of a substance from a solid to a liquid at its melting point called?

Latent Heat of Fusion Signup and view all the answers

In the context of phase changes, what does the term 'specific latent heat' refer to?

The energy required for a substance to change its state per unit mass Signup and view all the answers

Which factor influences the rate of evaporation of liquid molecules?

Temperature Signup and view all the answers

What does the equation 𝑄 = 𝑚𝑐∆𝑇 represent in the context of heat capacity and specific heat capacity?

Amount of energy needed to change temperature Signup and view all the answers

If the specific heat capacity of water is known, what factor determines the amount of heat energy needed to raise its temperature by a certain amount?

Mass of Water Signup and view all the answers

Which term describes the equilibrium state between liquid and vapor phases at a specific temperature?

Latent Heat of Vaporization Signup and view all the answers