CAIE IGCSE Chemistry 5.1.4 Transfer of Thermal Energy During a Questions

Define and interpret enthalpy change, including the sign of ΔH and thermal energy transfer.

Exam points

define enthalpy change, ΔH
interpret the sign of ΔH for exothermic and endothermic reactions
relate thermal energy transfer to enthalpy change
identify enthalpy changes from energy diagrams
explain why a negative ΔH indicates an exothermic reaction
calculate or compare enthalpy changes from temperature data

[Maximum number: 1]

Two different experiments are done to find the enthalpy change, $\Delta H$ , of each reaction.
The temperature of each reaction mixture is measured at the beginning of the reaction and after 3 minutes.
experiment 2

experiment 1

Which row gives the correct sign for the value of $\Delta H$ for each experiment and identifies if the reaction is endothermic or exothermic?

experiment 1

experiment 2

negative and endothermic

positive and exothermic

negative and exothermic

positive and endothermic

negative and exothermic

positive and exothermic

negative and endothermic

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CAIE IGCSE Chemistry 5.1.4 Transfer of Thermal Energy During a Questions question 1