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Rates of ReactionIntroduction

The Reaction That Runs Backwards

Part of Reversible Reactions — GCSE Chemistry

This introduction covers The Reaction That Runs Backwards within Reversible Reactions for GCSE Chemistry. Revise Reversible Reactions in Rates of Reaction for GCSE Chemistry with 20 exam-style questions and 12 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 1 of 12 in this topic. Use this introduction to connect the idea to the wider topic before moving on to questions and flashcards.

Topic position

Section 1 of 12

Practice

20 questions

Recall

12 flashcards

📖 The Reaction That Runs Backwards

Imagine heating blue copper sulfate crystals in a test tube — they turn white as water escapes. Now add a few drops of water back… and they turn blue again. The same reaction, running in reverse. This isn't a trick: the product of the forward reaction becomes the reactant of the backward reaction. This is reversible chemistry, and it changes everything about how we think about reactions — because in a closed system, the reverse reaction starts immediately after the forward one.
🚪 The Revolving Door Analogy

Reversible reactions are like a revolving door! People can go in (forward reaction) AND come out (backward reaction) through the same door. Both directions happen at the same time. The ⇌ symbol shows this two-way traffic. Just like a revolving door, both processes are happening constantly — it just looks still when the same number enter as leave!

Keep building this topic

Read this section alongside the surrounding pages in Reversible Reactions. That gives you the full topic sequence instead of a single isolated revision point.

Reversible Reactions DiagramDeep Dive: The Reversible SymbolHow Reversible Reactions Work

Practice Questions for Reversible Reactions

What does the symbol ⇌ mean when used in a chemical equation?

  • A. The reaction is very fast
  • B. The reaction produces a gas
  • C. The reaction can proceed in both the forward and backward directions
  • D. The reaction requires a catalyst
1 markfoundation

Explain the relationship between the energy changes in the forward and reverse reactions of a reversible reaction.

2 marksstandard

Quick Recall Flashcards

What is a reversible reaction?
A reaction where products can react together to reform the original reactants
What symbol shows a reaction is reversible?
⇌ (double arrow)

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Reversible Reactions Diagram