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1.1 INTRODUCTION :
- Chemical Reaction: The breaking and making of bonds between different atoms to produce new substances are called reactions.
- Chemical Equation: The representation of chemical reactions in the form of formulae of reactants and products separated by an arrow mark.
- Balanced Equation: The same number of atoms of each element on the LHS (i.e, reactants) and RHS (i.e, products) of the equation.
- Informative Equation: Representation of physical states using symbols like s (solid), l (liquid), g (gas), aq (water-soluble solutions), etc.
- Combination Reaction: When two elements or one element and one compound or two compounds combine to give one single product.
- Decomposition Reaction: Splitting of a compound into two or more simpler products.
- Displacement Reaction: More reactive metal ( non–metal ) displaces the less reactive metal (non–metal ) and takes its place.
- Oxidation Reaction: Reaction that involves the gain of oxygen or loss of hydrogen (loss of an electron.)
- Reduction Reaction: Reaction that involves the loss of oxygen or gain of hydrogen (gain of electron).
- Redox Reaction: Chemical reaction which shows both oxidation and reduction reaction.
- Precipitation: The formation of insoluble compounds are called precipitate in a reaction.
- Rancidity: Oils and fats gets oxidised when exposed to air show a change in smell and taste
- Rusting: Iron reacts with oxygen and moisture and forms a reddish brown substance
- Corrosion: Metal when attacked by oxygen,water, acids or gases,present in the air change its surface.