Mass changes when the product is a gas - AQA GCSE Chemistry

This lesson is designed for a mixed ability year 9 class studying the AQA GCSE Combined Science Trilogy specification, at the start of the topic ‘Quantitative Chemistry’.
This lesson is focused on changes in mass during a chemical reaction where a product is a gas.
This lesson contains a guided practical activity (the reaction between calcium carbonate marble chips and hydrochloric acid).
A risk assessment is included.
There are also plenty of independent practice tasks, as well as exam questions with modelled answers.
This lesson also briefly recaps state symbols and balancing symbol equations.

All of my lesson resources contain:

• A 5-in-5 retrieval-style starter
• An interesting lesson hook, careers link, or retrieval practice to start the lesson
• Teacher input slides with dual coding and reduced cognitive load
• Teacher models
• Regular ‘check for understanding’ slides, such as hand signals quizzes
• Regular student independent practice slides, with optional scaffolds, challenges and answer slides
• A plenary task