Same chapter3 marksDifficulty: Medium
What is a catalyst? Give one example with the reaction it catalyses.
Chemical Changes and Reactions
3 marksDifficulty: Medium
What is a reversible reaction? Give one example and state how it is written.
Original Khojo Papers practice question — not from a past board paper.
Answer
A reversible reaction is one in which the products react to re-form the reactants, so it proceeds in both directions and never goes to completion. The formation of ammonia from nitrogen and hydrogen is an example, and such a reaction is written with a double arrow.
No citable source has been recorded for this record. Treat it as practice material, not as fact.
Explanation
At equilibrium the two opposing reactions proceed at the same rate.
Related questions
From the same topic and chapter, at a similar level.
Same chapter3 marksDifficulty: Medium
Distinguish between an exothermic and an endothermic reaction, with one example of each.
Chemical Changes and Reactions
Same chapter3 marksDifficulty: Medium
Name four types of chemical reaction and give one equation for each.
Chemical Changes and Reactions
Same chapter3 marksDifficulty: Medium
Name four conditions that may be necessary to bring about a chemical change.
Chemical Changes and Reactions
Same chapter2 marksDifficulty: Easy
State three differences between a physical and a chemical change.
Chemical Changes and Reactions
Same chapter2 marksDifficulty: Easy
State two differences between a physical change and a chemical change.
Chemical Changes and Reactions