Begin with 3 free Unit 11 practice problems. When you want more reps on q = mcΔT, calorimetry, enthalpy, and energy changes, premium unlocks Quick Sets of 3, Standard Sets of 9, and Extended Sets of 18 from this 84-problem bank.
3 Free Sample Problems
Work these 3 to find out whether the thermochemistry relationships are organized in your head — or whether the signs, direction, and setup still need more deliberate practice.
#4Calorimetry
A 50.0 g metal sample at 95.0°C is added to 100.0 g of water at 22.0°C. The final temperature is 27.8°C. What is the specific heat of the metal? (c_water = 4.18 J/g°C)
#5Enthalpy
For a reaction with ΔH = -286 kJ, which of the following is true?
#6Hess's Law
Given: C + O2 → CO2, ΔH = -393 kJ and CO + ½O2 → CO2, ΔH = -283 kJ. Find ΔH for: C + ½O2 → CO.
Prep for the test — not just the homework
The 3 free problems show you where you stand. The full bank is how you close the gaps before the test.
Randomized every time — fresh problems that force real understanding, not answer memorization
Full worked solutions — see exactly where your setup went off track, not just whether you were right
84 problems across heat transfer, phase changes, Hess's Law, and thermochemical stoichiometry
Quick (3), Standard (9), or Extended (18) — use whatever fits your schedule
Filter by type — focus on calculation, concept, or multi-step problems first
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General Chemistry · Unit 11 · Thermochemistry Practice