Page 41 - Chemistry ICSE Class IX
P. 41

CHAPTER 2











           Chemical Changes and Reactions












                                                    TOPICS COVERED

              ƒ  Physical changes               ƒ  Energy changes in chemical       evolved — photochemical
              ƒ  Chemical changes                 reactions                         reactions
              ƒ  Changes involving both         ƒ  Reactions in which heat is     ƒ  Combustion
               chemical and physical              either absorbed or evolved      ƒ  Change in mass on burning
               changes                          ƒ  Reactions in which electrical   ƒ  How is the balance of
              ƒ  Conditions necessary for         energy is either absorbed or      carbon dioxide and oxygen
               a chemical reaction to take        evolved — electrochemical         maintained in nature
               place                              reactions                       ƒ  Oxygen cycle
              ƒ  Types of chemical reactions    ƒ  Reactions in which light       ƒ  Carbon dioxide cycle
               (or chemical changes)              energy is either absorbed or





                                         Highlight the past and                          Allow you to explore a
                BOXED FEATURES           future developments in   ACTIVITIES             topic further
                                         science



                                                                                         Help develop your
                TOPIC-WISE               Provide the first step in   ILLUSTRATIVE        understanding for the
                ASSIGNMENTS              testing your learning  QUESTIONS                topics studied



                                         Enable you to measure
                LET US ANSWER SOME       your conceptual        LET US SAY IT AGAIN      Helps you to reflect back
                MORE QUESTIONS           understanding                                   on what you have learned
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