States of Matter: Deposition, Boiling, and Evaporation

Questions and Answers

What is the primary reason behind the increase in the rate of evaporation with an increase in surface area?

Evaporation is a surface phenomenon, and an increase in surface area provides more area for the particles to evaporate.

How does an increase in temperature affect the rate of evaporation?

An increase in temperature provides more kinetic energy to the particles, enabling more of them to go into the vapour state, thus increasing the rate of evaporation.

What is the effect of humidity on the rate of evaporation?

An increase in humidity decreases the rate of evaporation, as the air is already saturated with water vapour and cannot hold more.

Why do clothes dry faster on a windy day?

The increase in wind speed moves away the particles of water vapour, decreasing the amount of water vapour in the surrounding and increasing the rate of evaporation. Signup and view all the answers

What is the expected difference in the rate of evaporation between a test tube and an open china dish?

The rate of evaporation is expected to be higher in the open china dish due to its larger surface area. Signup and view all the answers

How does the rate of evaporation change on a rainy day compared to a sunny day?

The rate of evaporation is slower on a rainy day due to the higher humidity, whereas it is faster on a sunny day due to the lower humidity. Signup and view all the answers

What is the primary reason why the surroundings feel cold when a liquid evaporates in an open vessel?

The particles of the liquid absorb energy from the surroundings to regain the energy lost during evaporation. Signup and view all the answers

Why does your palm feel cool when you pour acetone on it?

The particles of acetone gain energy from your palm and evaporate, causing the palm to feel cool. Signup and view all the answers

What is the significance of sprinkling water on a hot surface?

The large latent heat of vaporization of water helps to cool the hot surface. Signup and view all the answers

Why is it recommended to wear cotton clothes in summer?

Cotton is a good absorber of water, which helps in absorbing sweat and exposing it to the atmosphere for easy evaporation, thereby cooling the body. Signup and view all the answers

What is the reason behind the formation of water droplets on the outer surface of a glass containing ice-cold water?

The water vapor in the air condenses on the cold surface of the glass, forming droplets. Signup and view all the answers

Why does evaporation occur more rapidly on a surface with a larger surface area?

A larger surface area provides more sites for molecules to evaporate, resulting in a faster rate of evaporation. Signup and view all the answers

What is the process called when a substance changes directly from the gaseous state to the solid state without going through the liquid state?

Deposition Signup and view all the answers

What is the term for the amount of heat energy required to change 1 kg of a liquid to gas at atmospheric pressure at its boiling point?

Latent heat of vaporization Signup and view all the answers

Why does evaporation cause cooling?

Because heat energy is required to overcome the forces of attraction between the liquid molecules, resulting in a decrease in temperature. Signup and view all the answers

What factor does the rate of evaporation depend on?

Surface area exposed to the atmosphere, temperature, humidity, and wind speed Signup and view all the answers

What is the difference between boiling and evaporation?

Boiling is a bulk phenomenon where particles from the whole liquid change into vapor, while evaporation is a surface phenomenon where particles from the surface gain enough energy to change into vapor. Signup and view all the answers

What is the term for the change of state from solid to liquid at atmospheric pressure?

Melting Signup and view all the answers