What is an exothermic reaction?

A A reaction that absorbs heat

B A reaction that releases heat to the surroundings

C A reaction with no energy change

D A reaction that only occurs at high temperatures

✓ Correct Answer: Option B

An exothermic reaction releases energy (usually as heat) to the surroundings. The enthalpy change (ΔH) is negative.

💡 Why is B) the correct answer?

The correct answer to the question "What is an exothermic reaction?" is Option B: A reaction that releases heat to the surroundings.

The other options — A) A reaction that absorbs heat, C) A reaction with no energy change, D) A reaction that only occurs at high temperatures — are incorrect for this IB Exam Prep question. As explained above: An exothermic reaction releases energy (usually as heat) to the surroundings. The enthalpy change (ΔH) is negative.

📚 About This IB Exam Prep Practice Question

This 2-level IB Exam Prep question from the Chemistry topic is part of BrainForge Quiz's free exam preparation library. Each question includes the correct answer and a detailed explanation to help you understand the underlying concept, not just memorize the answer.

How to use this page: Read the question above, consider all four options (A through D), then check the highlighted correct answer and explanation. For active timed practice, start a free IB Exam Prep practice test or use flashcards for spaced repetition review.

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What is an exothermic reaction?

✓ Correct Answer: Option B

📚 About This IB Exam Prep Practice Question

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