Worksheet 3: Dalton and the Atomic Structure Instructions: 1. Read page 22 in your Chemistry book 2. Watch the video What is an atom and how do we know it exists? and answer the following questions: https://www.youtube.com/watch?v=LhveTGblGHY 1. Who was the first person to propose the idea that matter consist of tiny particles? 2. What does the term atomos mean? 3. What other scientists contributed to the idea that matter could be broken into smaller particles? 4. What is the name for the foundational substances that cannot be broken down through normal chemical reactions? 5. How many elements are listed in the modern periodic table? How many occur naturally? How many are artificially produced? 6. Give examples of elements that are gases at room temperature? 7. Examples of elements that are solids 8. Examples of elements that are liquids at room temperature? 9. Explain the Law of Multiple Proportions 10. Who proposed the Atomic Theory of Matter? 11. What famous scientist confirmed the existence of atoms? 12. What are atoms? 13. How do we know they exist? Teacher´s Strategy Create assignment in Canvas and embed suggested video in the content editor. Teacher Resources for Live Class: CK12 –Molecule, atoms, mixture Simulation https://interactives.ck12.org/ https://interactives.ck12.org/simulations/chemistry/what-isair/app/index.html?hash=a3b800f9ccfe6c15b8fa587bd6e4fde9&source=ck12&artifactID=2931913 &courseContextID=5271771&encodedID=SCI.CHE.063
