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In a reaction energy diagram, which label represents the overall enthalpy change (ΔH), and how can you determine if the reaction is exothermic or endothermic?
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8. Thermochemistry
Endothermic & Exothermic Reactions
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In which type of chemical reaction is heat absorbed from the surroundings?
A
Endothermic reaction
B
Exothermic reaction
C
Neutralization reaction
D
Combustion reaction
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Understand the difference between endothermic and exothermic reactions: Endothermic reactions absorb heat from the surroundings, while exothermic reactions release heat to the surroundings.
Recall that in an endothermic reaction, the system gains energy, which means the surroundings lose energy, causing a temperature drop around the reaction site.
Recognize that neutralization reactions and combustion reactions are specific types of reactions that are generally exothermic, meaning they release heat.
Identify that the question asks for the type of reaction where heat is absorbed, which matches the definition of an endothermic reaction.
Conclude that the correct answer is an endothermic reaction because it involves the absorption of heat from the surroundings.
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