Question detail
In the thermal decomposition of ammonium chloride, 20 kJ of energy is absorbed when the solid decomposes into gaseous products. Identify whether the forward or reverse reaction is exothermic.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Reversible reactions and dynamic equilibrium
Question
In the thermal decomposition of ammonium chloride, 20 kJ of energy is absorbed when the solid decomposes into gaseous products. Identify whether the forward or reverse reaction is exothermic.
Answer
The forward reaction is endothermic, and the reverse reaction is exothermic.
Explanation
This question tests the understandingof energy changes in reversible reactions. Since the forward reaction absorbs energy, it is endothermic, while the reverse reaction releases energy, makingit exothermic. This answer is strongest when it stays anchored to Energy changes and reversible reactions and directly addresses identify whether the forward or reverse reaction is exothermicfrom given information.
Common mistake
Confusing Exothermic and Endothermic
Students often confuse which direction of a reversible reaction is exothermic and which is endothermic.
To fix this, carefully analyze the energy changes described in the reaction and remember that if one direction is exothermic, the opposite direction must be endothermic.
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