Same chapter3 marksDifficulty: Medium
Distinguish between an exothermic and an endothermic reaction, with one example of each.
Chemical Changes and Reactions
3 marksDifficulty: Medium
Name four conditions that may be necessary to bring about a chemical change.
Original Khojo Papers practice question — not from a past board paper.
Answer
Heat, light, electricity and pressure, and in many cases a catalyst or the presence of a solvent such as water.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
Photosynthesis needs light, the electrolysis of water needs electricity and the Haber process needs heat, pressure and a catalyst.
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State three differences between a physical and a chemical change.
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State two differences between a physical change and a chemical change.
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