Available Answers

1. 1.

   State whether the statements given below are true or false. If false write the correct statement.

   1. Matter is defined as anything that occupies space, has mass & can be perceived by the senses.
   2. Matter in any state is composed of particles called - atoms, molecules or compounds.
   3. An atom is the basic unit of matter e.g. O₂
   4. An ion is any atom, or a group of atoms which has a resultant charge, due to gain of electrons. e.g. 'O' gains electrons to give O^2-
   5. The quantity of matter represents its 'weight' & the gravitational pull on matter its - 'mass'.
   6. All three states of matter occupy space & have mass.
   7. Liquids have no definite volume or shape.
   8. From the three states of matter - gases have the least density.
   9. Of the three states of matter - only liquids have one upper free surface.
2. 2.

   Complete the statements given below pertaining to Kinetic theory of matter - by selecting the correct word from the list given below.

   Maximum, Particles, Force, Random motion, Spaces, Minimum

   1. The Kinetic theory of matter states that - all matter is composed of ______________.
   2. Particles of matter have _______________ between them.
   3. The particles attract each other with a _____________________.
   4. The particles are in continuous ________________________.
   5. The intermolecular space between the particles of solid matter is __________________ while in gases it is ______________.
3. 3.

   The statements given below are -
   characteristics of solids, liquids and gases on the basis of Kinetic theory.

   Match the characteristics in Column I with the state of matter i.e. solid, liquid or gas in Column II

   Column I Characteristics on the basis of - Kinetic theory	Column II State of matter  (solid, liquid or gas)
   a. Intermolecular spae between particles of matter - is minimum
   b. Force of attraction between particles - is almost negligible.
   c. Particles vibrate only about - their mean positions.
   d. Energy possessed by particles of matter - is least.
   e. Particles free to move in any direction and fill any space.

    

4. 4.

   With reference to the diagrammatic representation of the kinetic theory of matter - applicable to solids, liquids & gases - 
   Match the representation in Column I with the correct state of matter in Column II.

   Column I	Column II
   1. Very large amount - of kinetic energy possessed by molecule.	A. Solids B. Liquids C. Gases
   2. Movement about their own position - by atoms or molecules.
   3.  Maximum - inter-particle space - between atoms.
   4. Not very strong - inter-particle attraction between atoms.
   5. Random movement of particles of atoms.

    

5. 5.

   Matter exists in three states - Solids, Liquids & Gases.

   

   1. In the diagram given above place the terms - 'Liquefaction', 'Vaporisation', 'Melting', 'Sublimation' & 'Solidification' in the appropriate places at 'A', 'B', 'C', 'D', or 'E'.
   2. State two variable factors which affect the change of state of matter - i.e. from one state to another.
   3. Differentiate between the terms - 'change of state of matter' & 'inter-conversion of matter'.
   4. Complete the following statements by filling in the correct word/s in the blank - from the list of words given below.

   Liquefaction point, Melting point, Freezing or solidification point, Boiling point

   The temperature at which - following changes takes place -
   i. Ice to water
   ii. Water to water vapour
   iii. Water vapour to water
   iv. Water to ice (pressure 760 mm of Hg)

    

6. 6.

   Complete the statements by selecting the correct answer from 'A' or 'B'.

   1. During melting-
      1. Particles lose energy & inter-particle space - decreases.
      2. Particles gain energy & inter-particle space - increases.
   2. During vaporisation -
      1. Inter-particle attraction - decreases & at boiling point - particles become free.
      2. Inter-particle space - decreases & inter particle attraction - increases.
   3. During liquefaction -
      1. Particles - lose energy & inter-particle attraction - increases.​​​​​
      2. Inter-particle space - decreases greatly & inter-particle attraction - decreases.
   4. During solidification -
      1. Inter-particle space - increases & at solidification point - particles slow down.
      2. Particles - lose energy & inter-particles attraction - increases.