38 7.4 Calorimetry and Heat Capacity

Figures

Figure 7.4.1: Calorimetery

A diagram showing two stages of a calorimeter during chemical reactions. On the left (a), labeled ‘System Exothermic process’, a calorimeter contains a substance that, during an exothermic reaction, releases heat indicated by outward arrows, resulting in a rise in temperature shown by a red upward arrow on the thermometer. On the right (b), labeled ‘System Endothermic process’, it depicts an endothermic reaction where the substance absorbs heat, indicated by inward arrows, leading to a drop in temperature as shown by a red downward arrow on the thermometer. Both scenarios highlight the heat exchange between the system and the solution surrounding it.

Practice questions

Multiple choice questions (There is/ are one or more correct answer(s) for each question)

1. Which of the following are commonly used as units of energy within science?
   1. Joules
   2. Moles
   3. Kelvins
   4. Calories
   5. Newton
2. What type of thermodynamic system is a “coffee-cup” calorimeter?
   1. open
   2. closed
   3. isolated

True/false question

1. Endothermic reactions can be measured with a bomb calorimeter.

Short-answer question

1. The specific heat capacity of water is _____________ JK⁻¹g⁻¹.

Solutions

Multiple choice questions

1. a, d
2. b

True/false question

1. False

Short-answer question

1. 4.18/ 4.186