AP Chemistry Unit 6 Quiz

Sep 29, 2026

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AP Chemistry Unit 6 quiz focused on thermochemistry and heat transfer, including identifying exothermic vs endothermic reactions, interpreting energy profiles to determine activation energy for reverse reactions, and applying calorimetry calculations for metal and water, milk warming, and mixed-food heating. Additional questions use enthalpy data and bond enthalpies to compute reaction heat changes, then extend to specific heat capacity, melting-point and temperature-time graph reasoning, energy partitioning, and boiling-point predictions based on heat required to reach phase change.

LanguageEnglish

CategoryExam

FormatPDF

Pages13

Reading Time33 min

AccessFree to download

Quiz Questions

Multiple-choice thermochemistry and calorimetry

AP Chemistry Unit 6 Quiz 1. Refer to the diagram below. Which of the following best describes the reaction? A. Exothermic, it gives out heat B. Endothermic, it gives out heat C. Exothermic, it absorbs heat D. Endothermic, it absorbs heat 2. Refer to the diagram below (may not be drawn exactly to scale) What is the activation energy for the reverse reaction? A. 80 kJ B. 60 kJ C. 40 kJ D. 20 kJ 3. A 100 g metal block with the specific heat capacity of 480 J kg-1 K-1 is heated in a beaker of water until it is boiling at room temperature (20°C). After that, the metal block is immediately transferred into a cooler beaker of water. The temperature rise in the cooler beaker of water is 1°C. What is the mass of cold water? Assume no energy loss to surroundings.(Specific heat capacity of water is 4200 J kg-1 K-1) A. 0.142 kg B. 0.914 kg C. 1.14 kg D. The question cannot be solved as the final temperature is not given. 4. A wooden block and a metal block are heated up at the same time at the same rate. The metal block is twice the mass of the wooden block. The wooden block has a specific heat capacity 3 times of the metal block. The temperature of the metal block is increased by k°C while the temperature of the wooden block is increased by n°C . What is kn ? A. 3 2 B. 2 3 C. 1 2 D. 1 6 5. Which of the following processes release the most amount of energy? A. 50 g of ice melting B. 50 g of metal cooling of 500 J kg-1 K-1 down from 70 °C to 20 °C C. 50 g of steam condensing into water D. 50 g of water freezing into ice 6. Maya wants to warm up a glass of milk (250mL) which is 4°C . About how much energy has tobe supplied to warm up her glass of milk to 40 °C ? The density of milk is 1.035 kg/L while the specific heat capacity is 3930 J kg-1 K-1 A. 9315 J B. 34200 J C. 36600 J D. 354000 J 7. The heat capacity of 0 . 5kg of carrots is 940 J K-1 , the heat capacity of 1.5 kg of cabbage is 2940 J K-1 while the heat capacity of 3 kg of beef is 5010 J K-1 . The food are in room temperature, and must be heated up to 100 °C to be safe to eat. Which of the following combinations require the least amount of energy for cooking? A. 1.7 kg of carrots, 2 kg of beef and 3.1 kg of cabbage B. 2 kg of carrots, 1.2 kg of beef and 2.4 kg of cabbage C. 4.3 kg of carrots, 0.4 kg of beef, 1.9 kg of cabbage D. 1.9 kg of carrots, 2.9 kg of beef, 1.9 kg of cabbage 8. What is the change in enthalpy of the below reaction? AB2 + 3C −−> D + 2EF | Substance | ΔH ° | | --- | --- | | AB2 | 1.79 kJ/mol | | EF | -0.57 kJ/mol | A. 2930 J B. -2930 J C. -3660 J D. The answer can not be determined as we do not know the standard enthalpy of C and D 9. The following reaction occurs: CH3 OH + 128.49 kJ → 2 H 2 + CO If 100.8g of H 2 is produced, how many kJ of heat will be absorbed? A. 12951 kJ B. 6475.9 kJ C. 6424.5 kJ D. 7844.9 kJ 10. Carbon and hydrogen are combined to form methane in a closed container. C (s) + H 2 (g ) → CH4 (g ) ΔH = − 74.85 kJ If 30 g of H 2 is used, how much heat will be released? A. 2246 kJ B. 2228 kJ C. 1123 kJ D. 1114 kJ 11. A copper block is being heated up in room conditions. The result as follows: | Mass of copper block | m kg | | --- | --- | | Final temperature | 45 °C | | Initial joulemeter reading | R 1 J | | Finial joulemeter reading | R2 J | What is the specific heat capacity of the copper block? A. 26 m (R2 − R1 ) B. R12Rm1 C. R11Rm2 D. The specific heat capacity can not be determined because the initial temperature is unknown 12. Two solids X and Y of equal mass are separately heated by two identical heaters. The graph below shows the variation of the temperatures of the substances with time. Which of the following statements is/are false? I. The melting point of X is higher than that of Y. II. The specific heat capacity of X is larger than that of Y. A. I only B. II only C. I and II only D. None of the ab

FAQs

How do you decide whether a reaction is exothermic or endothermic in this quiz?

Compare the heat flow shown in the diagram: releasing heat corresponds to exothermic, while absorbing heat corresponds to endothermic.

How is activation energy for the reverse reaction determined?

Use the energy diagram to find the activation energy for the reactants in the reverse direction, based on the difference between the reverse reactant energy level and the transition state.

What method is used for calorimetry problems about heating water or other substances?

Use Q = mcΔT with the given specific heat capacities and masses, assuming no energy loss to the surroundings, then solve for the unknown mass, temperature, or heat energy.

Sep 29, 2026

Upload by aboduw