“Facts are not science — as the dictionary is not literature.”BY DEEPTHIKA TALLURICHAPTER1Chemical Reactions and EquationsConsider the following situations of DAILY life and think what happenswhen – milk is left at room temperature during summers. an iron tawa/pan/nail is left exposed to humid atmosphere. grapes get fermented. food is cooked. food gets digested in our body. we respire.In all the above situations, the nature and the identity of the initialsubstance have somewhat changed. We have already learnt about physicaland chemical changes of matter in our previous classes. Whenever a chemicalchange occurs, we can say that a chemical reaction has taken place.You may perhaps be wondering as to what is actually meant by achemical reaction. How do we COME to know that a chemical reactionhas taken place? Let us perform some activities to find the answer tothese questions.Figure 1.1Burning of a magnesium RIBBON in air and collection of magnesiumoxide in a watch-glassActivity 1.1CAUTION: This Activity needsthe teacher’s assistance. Itwould be better if studentswear EYE protection. Clean a magnesium ribbonabout 2 cm long by rubbingit with sandpaper. Hold it with a pair of tongs.Burn it using a spirit LAMP orburner and collect the ash soformed in a watch-glass asshown in Fig. 1.1. Burn themagnesium ribbon keeping itas far as possible from youreyes.Plz mark me as brainliest........