Exploring Energy Transfers: Exothermic and Endothermic Reactions

Exploring Energy Transfers: Exothermic and Endothermic Reactions

Learning Objective

Understand energy transfers in a system, differentiate between exothermic and endothermic reactions, and learn how to calculate energy changes.

What do you already know about energy transfers in a chemical system?

Energy Transfers in a System

Energy can be transferred within a system during chemical reactions. It can be released or absorbed.

Exothermic Reactions

Exothermic reactions release energy to the surroundings in the form of heat. The temperature of the surroundings increases.

Endothermic Reactions

Endothermic reactions absorb energy from the surroundings. The temperature of the surroundings decreases.

Calculating Energy Changes

Energy changes in chemical reactions can be calculated using the equation: energy change = mass of substance × specific heat capacity × temperature change.

Example Calculation

Given mass of substance: 50g, specific heat capacity: 4.18 J/g°C, temperature change: 10°C. Calculate the energy change.

Practice Problems

Distribute practice problems to the students to reinforce their understanding of calculating energy changes in exothermic and endothermic reactions.

Review and Conclusion

Summarize the key points about energy transfers, exothermic and endothermic reactions, and solving energy change calculations.

Write down 3 things you learned in this lesson.

Have students enter three things they learned in this lesson. With this they can indicate their own learning efficiency of this lesson.

Write down 2 things you want to know more about.

Here, students enter two things they would like to know more about. This not only increases involvement, but also gives them more ownership.

Ask 1 question about something you haven't quite understood yet.

The students indicate here (in question form) with which part of the material they still have difficulty. For the teacher, this not only provides insight into the extent to which the students understand/master the material, but also a good starting point for the next lesson.