Tag: chemistry

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Questions Related to chemistry

Multiple choice chemistry states of matter: boiling, evaporation and condensation atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

On decreasing the surface area, the rate of evaporation _________.

  1. increases

  2. decreases

  3. remains same

  4. Data insufficient
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

On decreasing the surface area, fewer particles are exposed to the atmosphere. So the rate of evaporation decreases.

Multiple choice chemistry states of matter: boiling, evaporation and condensation atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

On decreasing the humidity, the rate of evaporation __________.

  1. increases

  2. decreases

  3. remains same

  4. Data insufficient
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Rate of evaporation is inversely proportional to humidity as the water vapours are already present in humid condition.

Multiple choice chemistry states of matter: boiling, evaporation and condensation atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

Change of a liquid into vapors at any temperature below its boiling point is called as ______________.

  1. solidification

  2. gasification

  3. evaporation

  4. liquifaction
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In the case of liquids, a small fraction of particles at the surface, having higher kinetic energy, is able to break away from the forces of attraction of other particles and gets converted into vapour. This phenomenon of change of a liquid into vapours at any temperature below its boiling point is called evaporation.

Multiple choice chemistry states of matter: boiling, evaporation and condensation atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

Evaporation is a type of vaporization of a liquid that occurs from _________.

  1. bottom of a solid

  2. bottom of a liquid

  3. surface of a gas

  4. surface of a liquid
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Evaporation is a type of vaporization of a liquid that occurs from the surface of a liquid into a gaseous phase that is not saturated with the evaporating substance. Evaporation occurs only at the surface of a liquid.

Multiple choice chemistry states of matter: boiling, evaporation and condensation atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

Water vapor is indirectly proportional to ___________.

  1. temperature

  2. surface area

  3. humidity

  4. wind speed
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Humidity is the amount of water vapour present in air. The air around us cannot hold more than a definite amount of water vapour at a given temperature. If the amount of water in air is already high, the rate of evaporation decreases. Hence, it is indirectly proportional to humidity.

Multiple choice chemistry states of matter: boiling, evaporation and condensation atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

Why do clothes dry faster on a windy day?

  1. Evaporation increases with increase in wind speed.

  2. Evaporation increases with increase in humidity.

  3. Evaporation decreases with increase in wind speed.

  4. The above statement is incorrect.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Evaporation increases with increase in wind speed. With the increase in wind speed, the particles of water vapour move away with the wind, decreasing the amount of water vapour in the surrounding. Hence, clothes dry faster on a windy day.

Multiple choice chemistry states of matter: boiling, evaporation and condensation atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

When liquid takes up heat from the surrounding, the surrounding ____________.

  1. cools down

  2. heats up

  3. remains unchanges

  4. none of above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Liquid requires latent heat of vaporization. So, when the liquid takes up the heat from the surrounding to vaporize, the temperature of surrounding reduces, and it cools down due to loss of heat.

Multiple choice chemistry states of matter: boiling, evaporation and condensation atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

Coolers are more effective in areas with ___________.

  1. low humidity

  2. high humidity

  3. both a and b

  4. none of above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Decrease in humidity increases the rate of evaporation. Coolers work on the concept of evaporation. In high humid areas, rate of evaporation is low and hence, cooler is ineffective. On the other hand, in low humid areas, the rate of evaporation is high which causes cooling and thus, coolers are effective in such areas.

Multiple choice chemistry states of matter: boiling, evaporation and condensation atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

Evaporation of water will be faster:

  1. near the sea

  2. far away from the sea

  3. both at equal rates

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Increase in humidity, reduces the rate of evaporation. The area near sea will be more humid as compared to the area far away from the sea. Hence, evaporation will be faster far away from the sea.

Multiple choice chemistry states of matter: boiling, evaporation and condensation atmospheric pressure and boiling point evaporation - factors and effects in daily life changes in physical state - boiling, evaporation and condensation

Evaporation that occurs directly from the solid phase below the melting point is called as:

  1. sublimation

  2. solid evaporation

  3. gasification

  4. none of above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Evaporation that occurs directly from the solid phase below the melting point, as commonly observed with ice at or below freezing or moth crystals (napthalene or paradichlorobenzene), is called sublimation.