AnswersFoothill-B Period-Chemistry-2627BThermochemical EquationsQuestion 6
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Thermochemical Equations

Question 6 • Foothill-B Period-Chemistry-26/27B

It is important for scientists to know how much energy is given off or absorbed in a chemical reaction. Which options below would indicate an exothermic reaction?H = –H = + Energy is considered a reactant in the reaction: A + B + energy C + DEnergy is considered a product in the reaction: A + B C + D + energyEnergy is released in the reaction.Energy is absorbed in the reaction.

Answer
A
H = –
B
H = +
C
Energy is considered a reactant in the reaction: A + B + energy C + D
D
Energy is considered a product in the reaction: A + B C + D + energy
E
Energy is released in the reaction.
F
Energy is absorbed in the reaction.

Explanation

An exothermic reaction releases energy to its surroundings, so its enthalpy change is negative (ΔH < 0). Energy can be written on the product side of the reaction because it is produced, and the reaction is described as releasing energy. Thus, the correct choices are “H = –,” energy as a product, and energy released.

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