MDCAT Thermochemistry MCQs
Customize your practice drill: select target topics, configure your question limit (up to 180 MCQs per test), and choose your mode.
Total Topics
6
Selected Topics
1
Available MCQs
115
Question Limit
Up to 180
Select Topics to Practice
Questions will be drawn only from checked topics.
Test Configuration
Configure question count (limit 180) and testing mode.
Selected topics have 115 total questions. Test will draw 50 shuffled MCQs.
Sample Thermochemistry MCQs with answers
Try these questions, then open the answer to check your reasoning. Use the quiz above for more topics and a complete review.
Thermodynamics
1. Heat exchange between the system and surroundings at constant volume is shown by the relation:
- A.
- B.
- C.
- D.
View answer and explanation
Answer: B.
At constant volume no pressure-volume work is done (, so the first law delta + w reduces to delta the heat exchanged equals the change in internal energy. Enthalpy change equals heat only at constant pressure. Hence delta
Hess's Law
2. For the reaction A → D, three possible steps have values A → kJ, B → kJ and C → kJ. Overall is:
- A. +15 kJ
- B. +85 kJ
- C. -85 kJ
- D. -15 kJ
View answer and explanation
Answer: D. -15 kJ
The path sum is 10 + 25 - kJ.
First Law
3. Internal energy (E) change is equal to
- A. Heat (q) - Work (w)
- B. Heat (q) * Work (w)
- C. Heat (q) / Work (w)
- D. Heat (q) + Work (w)
View answer and explanation
Answer: D. Heat (q) + Work (w)
Internal energy E is the total (kinetic + potential) energy of the system, and = q + w (heat absorbed + work done on the system). Hence Heat (q) + Work (w) is correct. A ('Heat (q) - Work (w)'), B ('Heat (q) * Work (w)') and C ('Heat (q) / Work (w)') mis-sign the work term or confuse E with enthalpy.
About this unit
MDCAT Thermochemistry — Unit 24
502 practice MCQs covering Thermodynamics, Exo/Endothermic, Energy Terms, First Law, Hess's Law, Enthalpy. Select custom topics and sit tailored tests up to 180 questions per drill.
Common questions about Thermochemistry practice
How many Thermochemistry MCQs are available on DIFF. MDCAT?
The current Thermochemistry question bank contains 502 practice MCQs across 6 topics. This is the bank size, not the length of one test. Choose your topics and a question count from 1 to 180, limited by the questions available in those topics.
Which topics does the Thermochemistry quiz cover?
The selectable topics are Thermodynamics, Exo/Endothermic, Energy Terms, First Law, Hess's Law, Enthalpy. Use Select all for a broad chapter drill, Clear to start a focused selection, or choose individual topics. Questions are drawn from your chosen topics, so you can target a weak concept before returning to a wider test.
How do I build a custom Thermochemistry test?
Open the chapter builder, select one or more topics, enter your question count, and choose Tutor Mode or Timed Exam. The available-question total updates with your selection. Start Test generates a shuffled drill; you do not have to follow a fixed Quiz 1 or Quiz 2 sequence.
What is the difference between Tutor Mode and Timed Exam?
Tutor Mode gives feedback and an explanation after you choose an option, and you can change or clear that choice. Timed Exam runs a countdown and keeps explanations hidden until submission. Both modes let you move between questions, use the paper map, and submit for a complete review.
How do I review and download my Thermochemistry quiz?
Select Submit Quiz, then Submit & View Explanations. The review includes every question in your test, all options, your selection, the marked correct answer when a key is available, and the explanation. Download PDF saves a paginated review; Download Review saves an HTML copy you can open in a browser. The review also includes DIFF. MDCAT community links.
How should I use Thermochemistry MCQs to improve?
Start with a short tutor drill on one of these topics: Thermodynamics, Exo/Endothermic, Energy Terms. Read the explanation for incorrect and uncertain answers, revise the relevant textbook section, and retry before taking a timed drill. Compare your reasoning with the answer key rather than memorising the option letter.