Multiple Choice
When a sealed container of gas is placed into a fire, which of the following is most likely to occur?
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8. Thermochemistry
Endothermic & Exothermic Reactions
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Which of the following best describes an exothermic reaction?
A
A reaction that absorbs heat from its surroundings.
B
A reaction that requires continuous input of energy to proceed.
C
A reaction that releases heat to its surroundings.
D
A reaction in which the temperature of the surroundings decreases.
Verified step by step guidance1
Understand the definition of an exothermic reaction: it is a chemical reaction that releases energy, usually in the form of heat, to its surroundings.
Recall that when a reaction releases heat, the temperature of the surroundings increases because heat is transferred from the system to the surroundings.
Contrast this with an endothermic reaction, which absorbs heat from the surroundings, causing the surroundings to cool down.
Analyze each option: the correct description of an exothermic reaction is the one stating that the reaction releases heat to its surroundings.
Therefore, the best description of an exothermic reaction is: 'A reaction that releases heat to its surroundings.'
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