IBDP Chemistry Chapter 5 Notes

energetics and thermochemistry


These notes have especially been curated by expert teachers to simplify and enlighten concepts given in IB Chemistry. The notes are comprehensive and are sufficient to study the chapter in-depth. One need not look for other resources beyond the notes provided on our website which can be accessed for free. The notes for Chemistry IBDP are available on our official website and can be downloaded for free. You are one click away from obtaining all that you need to score well in IB Chemistry.

Chemistry IBDP is one of the six group 4 Sciences of the IB curriculum. The IBDP Chemistry program explores the three important aspects of chemistry: Physical, Organic, and Inorganic chemistry. The program requires the student to take a look at the qualitative and quantitative aspects of each of the sections using a range of techniques. These techniques range from informative theoretical knowledge to practical applications in the lab and the real world. This holistic approach allows students to learn in a variety of methods including but not limited to exploration, discovery, gathering and interpreting data, analysing outcomes, and giving feedback. The IBO’s special attention to criteria ensures that the student can interconnect the subjects they have chosen and be able to apply them in real life.

In this chapter of IBDP Chemistry, we take an in-depth look at Energetics and Thermochemistry. The concept focuses on a chemical reaction in terms of the energy changes that occur. The chapter can be divided into 5 sections, all of which are covered in a comprehensive manner in our notes. We begin by introducing exothermic and endothermic and learning to identify the differences between the two using graphs and numerical values. We then learn how to calculate the energy change of a reaction using varying practical setups and formulas. The next section discusses Hess’ law and its application in numerical problems. We also learn about bond enthalpy values and how to calculate the overall energy change of a reaction using them. We are then introduced to the Born-Haber Energy Cycle and its use in calculating the overall energy change of formation of an ionic compound, using varying enthalpy values such as Ionisation energy and the energy change of lattice formation. In the same section, we also discuss the different types of enthalpy depending on the reaction. Finally, we end the chapter with Entropy, Gibbs Free energy, and their respective numerical formulas that help quantify the disorder of a system and the likeliness of a reaction occurring.

At the end of this chapter, we can expect the students to identify energy changes within chemical reactions.