Question

one word for the following: (5×1=5)
a) A state of matter that has a definite volume but no definite shape.
b) The process of conversion from liquid state to solid state.
c) The fixed temperature at which vapours changes to liquid state.
d) A state of matter that is highly diffusible.
e) A state of matter that has zero compressibility.
II. Fill in the blanks: (5×1=5)
a) A substance co-exists in solid state and liquid state at ____________________.
b) On heating, water changes into _______________________.
c) In _____________ State, the force of attraction between the particles is maximum.
d) The gases can be liquified by increasing ______________.
e) The movement of particles is random in ______________ state.
III. Answer the following questions in two or three sentences: (5×2=10)
a) Explain sublimation with the help of an example.
b) How increase in temperature affects state of matter?
c) What do you mean by condensation point? Mention the condensation point for water
vapour?
d) Explain the arrangement of particles in a solid.
e) Write two characteristics of particles of matter.

Answer 1

Answer:

I . One word :

a ) Liquid

b ) Freezing or Solidification

c ) Boiling

d ) Gaseous state

e ) Solid state

II . Fill ups :

a ) Melting point

b ) Vapour

c ) Solids

d ) Increasing the pressure and decreasing the temperature.

e ) Gaseous state

III. Answer the following questions in two or three sentences:

a ) The Process of conversion of Solid to gas directly while heating is called Sublimation

Ex : Napthalene , Camphor

b ) As temperatures increase, additional heat energy is applied to the constituent parts of a solid, which causes additional molecular motion.

c ) Water condensation is the process by which water in the vapor or gaseous state reverts to the liquid phase under conditions lower temperature. Usually, the condensation point of water is the same as the boiling point of water. The point occurs at 212 degrees Fahrenheit or 100 degrees Celsius.

d ) Most solids are made up of tiny crystals. This is because their particles are arranged in a regular pattern, called a CRYSTALLINE STRUCTURE

e )

• The particles of matter are very, very small.
• The particles of matter have space between them.
• The particles of matter are constantly moving.
• The particles of matter attract each other.

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