Page 193 - ICSE Chemistry 8
P. 193

Review Your Learning





                 A.  Fill in the blanks.
                       1.  Water collected under the ground                                         ___________________
                       2. The con  nuous circula  on of water between land, water bodies
                           and atmosphere                                                           ___________________
                       3.  Water or any other liquid in which solute dissolves                      ___________________
                       4.  The amount of solute that dissolves in a par  cular solvent at a given
                           temperature to form a saturated solu  on                                 ___________________
                       5.  An opaque but homogeneous solu  on in which the solute size is
                           between 10 to 1000 Angstrom                                              ___________________
                       6.  Water present in the crystals of certain compounds                       ___________________


                 B.  State whether the given statements are true (T) or false (F).
                       1.  Water is used as a coolant in power genera  on from fossil fuels and also in car radiators.
                       2.  The boiling point of water decreases with increase in pressure.
                       3. A solu  on in which some more solute can be dissolved at a specifi c temperature is called unsaturated
                           solu  on.
                       4.  The crystallised water can be easily removed by hea  ng the compound.
                       5.  Magnesium reacts with steam vigorously and forms a red solid of magnesium oxide and hydrogen
                           gas.
                       6.  Hard water is not suitable for drinking and cooking purposes.

                 C.  Explain the following terms.
                       1. Water table                                  2. Chlorina  on
                       3. Dis  lla  on                                 4.  Anomalous expansion of water
                       5. Supersaturated solu  on                      6.  True solu  on

                       7. Suspension                                   8. Tyndall eff ect
                       9.  Hygroscopic substances                    10.  Deliquescence

                 D.  Answer the following ques  ons.
                       1.  Discuss the importance of water in our lives.
                       2.  Write a note on purifi ca  on of water.
                       3. Diff eren  ate between a true solu  on, suspension and colloid.
                       4. Diff eren  ate between hygroscopy, deliquescence and effl  orescence.
                       5.  Discuss the reac  on of metals with water (cold water, hot water and steam).
                       6.  What are the causes of hard water? How can the hardness of water be removed?





                   PROJECT
                   Create a PowerPoint presenta  on on the topic ‘Water of Crystallisa  on’. Find the related informa  on and
                   images using the Internet. Add audio and visual eff ects to your presenta  on. Format it as per your choice.



                  179                                                                                                  179
   188   189   190   191   192   193   194   195   196   197   198