Transcription of Notes CHEMICAL REACTION AND EQUATIONS
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Notes CHEMICAL REACTION AND EQUATIONS
CHEMICAL REACTION and EquationsSCIENCE AND TECHNOLOGY 70 NotesMODULE - 2 Matter in our Surroundings4 CHEMICAL REACTION ANDEQUATIONSE veryday we observe different types of changes in our surroundings. Some of thesechanges are very simple and are of temporary nature. Some others are reallycomplex and of permanent nature. When ice kept in a tumbler is exposed to theatmosphere, it melts and is converted into water. When the tumbler containing thiswater is kept in a freezer it is converted again into ice. Thus, this is a temporarychange and the substance comes to its original form. Such changes are physicalchanges. However, milk once converted into curd can not be converted into milkagain. Such changes are CHEMICAL changes. These changes are of permanent physical and CHEMICAL changes are integral part of our daily life.
chemical equation is called the Hit and Trial method . Let us consider another reaction for writing and balancing of a chemical reaction. When steam is passed over red hot iron, hydrogen gas (H 2 ) is evolved and magnetic
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