Tag: states of matter: boiling, evaporation and condensation

Questions Related to states of matter: boiling, evaporation and condensation

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

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

  1. sublimation

  2. solid evaporation

  3. gasification

  4. none of above

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Correct Option: A
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.

Which of the following is a volatile liquid?

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

  1. Alcohol

  2. Acetone

  3. Chloroform

  4. All of above

Show answer
Correct Option: D
Explanation:

A volatile liquid is one that evaporates or vaporizes quickly at room temperature. Volatile liquids have low boiling point. As a result, they evaporate very easily at room temperature. All the above liquids are volatile.

Why do we wear cotton clothes in summer?

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

  1. cotton absorbs water

  2. it leads to sweating

  3. both a and b.

  4. none of above

Show answer
Correct Option: A
Explanation:

Cotton absorbs water, and thus, causes sweating. Sweat comes out the clothing and in contact with the atmosphere. It evaporates taking up the heat from the surrounding and thus, gives a cooling effect.

A volatile liquid _____________.

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

  1. vaporizes quickly at room temperature

  2. solidifies quickly at room temperature

  3. liquifies quickly at room temperature

  4. does not vaporize quickly

Show answer
Correct Option: A
Explanation:

A volatile liquid is one that evaporates or vaporizes quickly at room temperature. Volatile liquids have low boiling point. As a result, they evaporate very easily at room temperature.

The process by which molecules undergo a spontaneous transition from the liquid phase to the gaseous phase is called as:

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

  1. boiling

  2. sublimation

  3. evaporation

  4. condensation

Show answer
Correct Option: C
Explanation:

The process by which molecules undergoes a spontaneous transition from the liquid phase to the gaseous phase is called as evaporation. In evaporation due to increase of temperature rate of evaporation also increases.

Condensation is the reverse of evaporation in which water vapor converts into liquid water by decreasing temperature.  

 Liquid which evaporates more quickly is ___________.

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

  1. spirit

  2. water

  3. grease

  4. oil

Show answer
Correct Option: A
Explanation:

Spirit is a volatile liquid which evaporates fastly than water and oil which have higher boiling point as compare to spirit. Grease is heavy, viscous oily material takes longer time to evaporate. Hence, spirit is the liquid which evaporates fastly. 

Evaporative cooling is the phenomenon  _____________.

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

  1. in which molecule of liquid with high kinetic energy evaporates fastly, leaving behind the particle of less kinetic energy

  2. in which molecule of liquid with low kinetic energy evaporates fastly, leaving behind the particle of high kinetic energy

  3. temperature change of the liquids

  4. none of these

Show answer
Correct Option: A
Explanation:

Evaporation is the surface phenomenon in which liquid molecules of high kinetic energy evaporates fastly from the surface of the liquid. Due to which the molecules of less kinetic energy remains in the solution and the temperature of the liquid decreases. Hence, it cools down. This phenomenon is known as evaporative cooling.

During evaporation of liquid,  ___________.

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

  1. the temperature of the liquid falls

  2. the temperature of the liquid rises

  3. the temperature of the liquid remains unchanged

  4. none of the above

Show answer
Correct Option: A
Explanation:

When liquid gets evaporated from the surface of liquid they convert from liquid state to gaseous state by absorbing energy from the liquid and due to it temperature of the liquid decreases.

Crystallisation technique is better than simple evaporation technique as __________.

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

  1. some solids are evaporated with solvent

  2. some solids decompose or some may get charred on heating to dryness

  3. some impurities may remain dissolved in the solution even after filtration, which on evaporation contaminate the solid

  4. both (B) and (C)

Show answer
Correct Option: D
Explanation:

Crystallisation technique for purification is better than evaporation because
1. The extent of purification in case of crystallisation technique is very high.
2. Does not require very high temperature conditions, there is no need to boil the solvent.
3. The technique does not require very high apparatus setup for performing the purification.
4. If the compound is soluble in one solvent & less soluble or insoluble in other solvents, crystallisation can be done by mixing of the two solvents only.

Water stored in earthen pots become cool in summer because:

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

  1. condensation

  2. evaporation

  3. precipitaion

  4. none

Show answer
Correct Option: B
Explanation:

The water kept in an earthen pot remain cool even in summer because earthen pot has many small holes. Water seeps out through them and evaporates from the surface of the pot. The energy needed for evaporation is taken from the water kept in the earthen pot. As a result, water kept in earthen pot become cool.