Original PromptThis learning resource focuses on the concept of matter and the Law of Conservation of Mass. It aims to help students understand that the total mass of matter remains constant in physical and chemical changes. The resource includes definitions of key terms such as mass, matter, conservation, and emphasizes the importance of observing these principles in both open and closed systems. Activities and guided practices encourage students to visualize and model atom rearrangement during reactions while using mathematical calculations to demonstrate conservation. It also addresses common misconceptions about mass 'disappearing' in open systems, helping students to understand the role of gases and provide illustrations to clarify their learning.