Thermochemistry

In the previous post, we talked about Heat Capacity and Specific Heat. The formula we use to calculate the heat transferred between the objects is given as:     By using this formula, we were able to calculate, for example, … Read more

In this set of practice questions, we will go over the main types of questions on calorimetry including the heat capacity, the heat of reaction, finding the final temperature of a mixture, constant pressure calorimetry, and constant-volume calorimetry. A few … Read more

What is enthalpy in simple words? Answering this question is the objective of today’s post. Remember, in the previous post, we talked about internal energy and how it can change by either heat or work.     Rearranging this equation … Read more

The terms endothermic and exothermic are used to describe the heat transfer during different processes including chemical reactions. In general, the focus in this chapter is going to be on heat transfer because thermochemistry is the study of heat change … Read more

Having a library of values for standard enthalpies of formation allows calculating the enthalpy of reaction without doing calorimetric analysis. There are two approaches to doing this. 1) The Direct Approach If the enthalpies of formations for all the components … Read more

A calorimeter is a device for measuring heat flow. One application of calorimetry is measuring the enthalpy of a reaction. So, how does heat become enthalpy? Remember, the formula for enthalpy change is:   ΔH = ΔE + ΔPV   … Read more

In the previous post, we talked about heat capacity, specific heat, and the formula for the relationship between these and the change in temperature.     Below are some additional practice examples of heat capacity problems.  When solving a problem … Read more

In the previous post, we talked about the Hess’s law and how it can be used for measuring the enthalpy change (ΔH) for a reaction without making calorimetric measurements. In short, the Hess’s law is based on the fact that enthalpy is … Read more

In this set of practice questions, we will summarize the main concepts of thermochemistry such as the relationship between internal energy, work and heat, exothermic and endothermic process, heat capacity, constant pressure calorimetry, constant-volume calorimetry, the enthalpy, the standard enthalpies … Read more