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Given the reaction: 2H_2(g) + O_2(g)
ightarrow 2H_2O(l), predict whether this reaction is exothermic or endothermic.
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8. Thermochemistry
Endothermic & Exothermic Reactions
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Which of the following best describes an endothermic reaction?
A
A reaction that absorbs heat from its surroundings.
B
A reaction in which the temperature of the surroundings increases.
C
A reaction that releases heat to its surroundings.
D
A reaction that produces light and heat as products.
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Understand the definition of an endothermic reaction: it is a chemical reaction that absorbs heat energy from its surroundings during the process.
Recall that when a reaction absorbs heat, the temperature of the surroundings typically decreases because heat is taken in by the system.
Contrast this with an exothermic reaction, which releases heat to the surroundings, causing the temperature of the surroundings to increase.
Analyze the given options and identify which one matches the characteristic of absorbing heat rather than releasing it or producing light.
Conclude that the best description of an endothermic reaction is 'A reaction that absorbs heat from its surroundings.'
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