Thermochemistry

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question 1 of 22 Grade: Form 3

Q: The diagram below shows the energy profiles for a chemical reaction. What is the correct description of the reaction?

Sign of ΔH: +, Overall energy change: Endothermic, Sign of EA: -
Sign of ΔH: +, Overall energy change: Endothermic, Sign of EA: +
Sign of ΔH: -, Overall energy change: Exothermic, Sign of EA: -
Sign of ΔH: -, Overall energy change: Exothermic, Sign of EA: +

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When the graph becomes horizontal, no more gas is being produced. This means the reaction has stopped because all the magnesium has been used up (since acid is in excess).

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Did You Know?

When the graph becomes horizontal, no more gas is being produced. This means the reaction has stopped because all the magnesium has been used up (since acid is in excess).

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