ICSE Class 8 Chemistry, Unit 6: Chemical Reactions

What this unit aims at

This theme will enable children to understand that several oxides, carbonates and hydrates on heating are converted to other compounds. Oxides of metals and non-metals have basic and acidic character respectively. They will also realize and appreciate that there are different types of reactions such as combinations, decomposition, displacement, double displacement, exothermic and endothermic reactions.

Your child should be able to

• describe different types of chemical reactions with examples
• identify the type of chemical reaction
• identify different oxides as basic, acidic, amphoteric and neutral
• explain the effect of heat on oxides of some metals

Key concepts in this unit

• Types of reactions:
• Combination Decomposition Displacement
• Double displacement.
• Reactivity series:
• In reactivity series metals are arranged in order of their reactivity.
• The metal that displaces the metal ion from the solution is more reactive.
• Predict the reactivity of metals.
• Endothermic and exothermic processes/ reactions.
• Neutralization reaction.
• Decomposition reactions to form Oxides.
• Classification of oxides:
• Acidic Basic Amphoteric Neutral.
• Metal oxides are basic; non- metal oxides are acidic in nature.
• Acidic oxides react with base and basic oxides react with acids. some oxides such as
• ZnO, PbO react both with acids and bases. These are amphoteric oxides.