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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

State the Various Conditions that Favour the Process of Evaporation. - Chemistry

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प्रश्न

State the various conditions that favour the process of evaporation.

टीपा लिहा

उत्तर

The various conditions that favour the process of evaporation are discussed as under :

  1. Concentration of water vapour in air: (humidity level) : If the water vapour concentration is high in air the evaporation process gets slowed down.
  2. Pressure : Evaporation takes place faster when pressure is less and vice versa.
  3. Surface Area: If the surface area is large then evaporation takes place faster.
  4. Temperature : On increasing the temperature, the rate of evaporation increases.
  5. Rate offlow of air : If air is moving over the place all the time, then the concentration of water vapour decreases in the surroundings, thus increasing evaporation rate.
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पाठ 2: Physical and Chemical Changes - Additional questions 8

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सेलिना Concise Chemistry [English] Class 7 ICSE
पाठ 2 Physical and Chemical Changes
Additional questions 8 | Q 4

संबंधित प्रश्‍न

Classify the following as chemical or physical change:

Making a fruit salad with raw fruits


Fill in the blank.

When a candle burns, wax melts. Melting of wax is a ________ change.


State whether the following is physical or chemical changes.

burning of sugar — 


Two chemical substances X and Y combine together to form a product P which contains both X and Y X + Y 􀁯 P
X and Y cannot be broken down into simpler substances by simple chemical reactions. Which of the following  statements concerning X, Y and P are correct ?

  1. P is a compound
  2. X and Y are compounds
  3. X and Y are elements
  4. P has a fixed composition

Classify the following as physical or chemical changes :

  1. Cooking of food
  2. Boiling of water
  3. Cutting of trees
  4. D0issolving salt in water
  5. Digestion of food
  6. Melting of ice

Change is the law of nature and occurs in our everyday life, at all times and in all places.
Differentiate between the following change with a suitable example.

Periodic and non-periodic change


Match the examples of changes in List I with the correct.

List I List II
1. Expansion of a steel rod on heating A: Physical change
2. Rotting of eggs B: Chemical change
3. Milk turning sour  
4. Tarnishing of copper  
5. Separation of naphthalene from a mixture of naphthalene and sodium chloride.  

Select the chemical changes from the following list of changes

The crystallisation of salt from its solution.


When solute is dissolved in a solvent it forms a solution.


State whether the following statements are true or false:

Anaerobic bacteria digest animal waste and produce biogas.


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