ExpertEasy1 markMultiple Choice
AQA GCSE · Question 01.2 · Energy changes
What does the symbol ⇌ mean?
What does the symbol ⇌ mean?
Answer options:
A.
Endothermic
B.
Exothermic
C.
Reversible
D.
Polymerisation
How to approach this question
Look at the symbol. It has two arrows, one pointing forwards and one pointing backwards. Think about what this implies about the direction of the chemical reaction.
Full Answer
C.Reversible✓ Correct
Reversible
The symbol ⇌ represents a reversible reaction. This means the reaction can go in the forward direction (from reactants to products) and also in the reverse direction (from products back to reactants). In this case, hydrated copper sulfate can be heated to form anhydrous copper sulfate and water, and anhydrous copper sulfate can react with water to reform hydrated copper sulfate.
Common mistakes
✗ Confusing the symbol with energy change terms like endothermic or exothermic.
✗ Thinking it represents a different type of reaction like polymerisation.
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