Danh mục: Chapter 1

  • Chapter 1. Chemical Reactions and Equations – Exercises

    Chapter 1. Chemical Reactions and Equations 1.4. Exercises and Group Activity A. Exercises 1. Which of the statements about the reaction below are incorrect? 2PbO(s) + C(s) → 2Pb(s) + CO2(g) (a) Lead is getting reduced. (b) Carbon dioxide is getting oxidised. (c) Carbon is getting oxidised. (d) Lead oxide is getting reduced. (i) (a) […]

  • Have You Observed The Effects Of Oxidation Reactions In Everyday Life?

    Chapter 1. Chemical Reactions and Equations 1.3. Have You Observed The Effects Of Oxidation Reactions In Everyday Life? 1.3.1. Corrosion You must have observed that iron articles are shiny when new, but get coated with a reddish brown powder when left for some time. This process is commonly known as rusting of iron. Some other […]

  • Types Of Chemical Reactions

    Chapter 1. Chemical Reactions and Equations 1.2. Types Of Chemical Reactions We have learnt in Class IX that during a chemical reaction atoms of one element do not change into those of another element. Nor do atoms disappear from the mixture or appear from elsewhere. Actually, chemical reactions involve the breaking and making of bonds […]

  • Chemical equations

    Chapter 1. Chemical Reactions and Equations Consider the following situations of daily life and think what happens when – 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, […]

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