2. Chemical Changes and Reactions
Chemical changes are defined by the formation of new substances and are accompanied by identifiable reactions, such as temperature changes and gas evolution. Various types of chemical reactions include combination, decomposition, displacement, double displacement, neutralization, and combustion, each characterized by unique properties. Energy changes during reactions can be exothermic or endothermic, and the law of conservation of mass holds true, indicating that mass is neither created nor destroyed in these processes.
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What we have learnt
- Chemical changes lead to the creation of new substances with distinct properties.
- Different types of chemical reactions include combination, decomposition, and displacement.
- Energy changes during reactions can be classified as exothermic or endothermic.
Key Concepts
- -- Chemical Change
- A process that results in the formation of new substances with different properties.
- -- Exothermic Reaction
- A reaction that releases heat, resulting in an increase in the temperature of the surroundings.
- -- Endothermic Reaction
- A reaction that absorbs heat, leading to a decrease in the temperature of the surroundings.
- -- Law of Conservation of Mass
- The principle stating that mass cannot be created or destroyed in a chemical reaction.
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