Available Answers

1. 1.

   Write M for the things that are 'matter' and NM for the things that are 'non-matter'.

   Food	Music	Book

    

2. 2.

   State true or false.

   1. Matter is made up of very huge particles called molecules.
   2. In solids, molecules are very loosely packed.
   3. In liquids, molecules are tightly packed.
   4. Gases have definite volume.
   5. Memories are matter.
3. 3.

   Rachel had collected some materials to see if they are solid, liquid or gas. She carried out some simple tests and filled in the table as given below. However, she is yet to finish this test. Read her results in the table and answer the questions that follow.

   Material	Can flow?	Can be compressed?	Has fixed shape?	Has fixed volume?
   1	Yes			Yes
   2	Yes	Yes	No
   3			Yes
   4				Yes

   1. What is material 2? Explain.
   2. What do you think is material 4? What additional test would you conduct to find out what it is?
   3. Do you think material 1 is a gas? Why or why not?
4. 4.

   Fill in the blanks.

   1. The process in which a solid changes into liquid is known as __________.
   2. __________ is the reverse of melting.
   3. The process in which a gas changes into liquid is known as __________.
   4. The substance that dissolves is known as __________.
   5. Together, solute and solvent form the __________.
   6. __________ substances can be separated from a solution by the method of evaporation.
   7. The process in which the insoluble impurities settle down is known as __________.
   8. When we __________ the matter, the molecules present in it start moving faster.
5. 5.

   Tick (√) the correct answer.

   1. In __________, molecules are very closely packed.
      1. liquids
      2. solids
      3. gases
      4. none of these
   2. Which of the following is a matter?
      1. Shadow
      2. Memories
      3. Voice
      4. Ship
   3. The process by which a gas changes into liquid on cooling is known as
      1. solidification
      2. condensation
      3. evaporation
      4. melting
   4. The substance that dissolves itself in liquid is known as
      1. solvent
      2. solution
      3. solute
      4. all of these
   5. The process by which a liquid changes into solid is known as
      1. evaporation
      2. melting
      3. solidification
      4. none of these
6. 6.

   State true or false.

   1. Matter is anything that occupies space.
   2. Tea is a non-matter.
   3. Gas is a matter.
   4. Salt does not dissolve completely in water.
   5. Solids and liquids are the only states of matter.
   6. The process in which the insoluble impurities settle down is known as decantation.