Multiple Choice
When ice cubes are placed in water at 45°C, which transfer of energy occurs?
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8. Thermochemistry
Endothermic & Exothermic Reactions
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During an endothermic reaction, which of the following statements is correct?
A
The temperature of the surroundings increases.
B
The enthalpy change, ΔH, is negative.
C
The system absorbs heat from the surroundings.
D
The system releases heat to the surroundings.
Verified step by step guidance1
Understand the definition of an endothermic reaction: it is a process in which the system absorbs heat from the surroundings.
Recall that in an endothermic reaction, the enthalpy change (\$\Delta H\$) is positive because the system gains heat energy.
Analyze the effect on the surroundings: since the system absorbs heat, the surroundings lose heat, which typically causes the temperature of the surroundings to decrease, not increase.
Evaluate each statement: the temperature of the surroundings does not increase, \$\Delta H\$ is not negative, and the system does not release heat to the surroundings.
Conclude that the correct statement is: 'The system absorbs heat from the surroundings,' which aligns with the characteristics of an endothermic reaction.
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