Students must go through these JAC Class 10 Science Notes Chapter 1 Chemical Reactions and Equations to get a clear insight into all the important concepts.
JAC Board Class 10 Science Notes Chapter 1 Chemical Reactions and Equations
→ Chemical reactions are observed in daily life such as spoiling of milk in summer, rusting of iron, formation of glucose by photosynthesis, digestion of food, etc.
→ In balanced chemical equation, the number of atoms of each element taking part in the reaction remains the same before and after the reaction.
→ In combination reaction, two or more substances combine to form a single new substance.
→ In decomposition reaction, a single substance breaks down to form two or more substances.
→ A reaction in which heat is absorbed during the formation of product is called an endothermic reaction.
→ A reaction in which heat is released during the formation of product is called an exothermic reaction.
→ In displacement reaction, more reactive element or a substance displaces the less reactive element or a substance from its solution.
→ In double displacement reaction, two different atoms or ions get exchanged.
→ Salt obtained in precipitation reaction is insoluble in water.
→ In an oxidation reaction, a substance gains oxygen or loses hydrogen.
→ In a reduction reaction, a substance gains hydrogen or loses oxygen.
→ Oxidising agent gives oxygen or receives hydrogen.
→ Reducing agent gives hydrogen or receives oxygen.
→ Oxidising agent undergoes reduction and reducing agent undergoes oxidation.
→ Metal corrosion: A reaction in which a surface of metal is affected by oxygen, water, chemical and atmospheric gases is called corrosion of metal or corrosion.
→ Rancidity: The food materials containing oils and fats when exposed to air for a long time, undergo oxidation changing their smell and taste. This is called rancidity.