This lesson is designed for the NEW AQA Trilogy Chemistry GCSE, particularly the ‘Chemical changes, electrolysis and energy changes’ SoW.
 
Students will firstly be shown a set of images, students will have to decide which are examples of an alkali/base and which are examples of acids. Next, students will watch a video on acids/alkalis and will need to answer a set of questions, after which they can self-assess their work using the mark scheme provided.
 
The next part of the lesson focuses on pH, students are firstly reminded of the importance of the pH scale and will then need to complete an investigation to identify the pH of different substances. Students can use the practical sheet provided to complete this task, including the results table to record their results.
 
The next part of the lesson looks at the difference between concentrated and dilute solutions, in terms of particles and in terms of risk/hazards when handling concentrated acids. Students will then need to summarise what they have learned with a fill-in-the-blank task, this work can be self-assessed using the mark scheme provided.
 
The final part of the lesson pupils will focus on the difference between strong and weak acids in terms of ionisation. Students will also look at how pH values are related to the concentration of H+ ions, students will need to copy and complete a table to show the concentration of H+ ions per mol dm3 for each pH value, this work can then be self-assessed using the mark scheme provided.
 
The plenary task is a ‘Pick a plenary’ task - pupils will need to either write a twitter message to summarise what they have learnt or write 5 quiz questions on the topics studied in the lesson.