CAST High School Practice Questions - California Science Test (CAST) - High School Exam

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A student burns methane and measures a temperature increase in the surroundings. How should the reaction energy change be classified for the chemical system?

Endothermic, because heat flows into the system Exothermic, because the system releases energy to the surroundings Neither, because temperature change does not relate to energy Endothermic, because bonds only break and never form

Correct Answer:

Exothermic, because the system releases energy to the surroundings

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