Chemical Reactions and Equations

Activity . Figure . Figure . Figure . Figure . Figure . Formation of hydrogen gas by the action of dilute sulphuric acid on zinc From the above three activities, we can say that any of the following observations helps us to determine whether a chemical reaction has taken place – change in state change in colour evolution of a gas change in temperature. As we observe the changes around us, we can see that there is a large variety of chemical reactions taking place around us. We will study about the various types of chemical reactions and their symbolic representation in this Chapter.