An excellent resource for pre-diploma grade 9 and 10 chemistry preparation for IB or A levels. This presentation and lesson are an excellent introduction to the mole, molar chemistry and the types of chemical calculations required throughout chemistry. It provides students with the basis for understanding what moles are, why they are used, and an introduction to basic conversions of mass-mole, Avogadro's number with atoms and molecules, and molar volumes. The presentation walks students through the idea of dimensional analysis, showcasing the mathematical idea of cancelling units. It lays the foundation for understanding how stoichiometry works and accurately quantifying reactants and products. What is included: 55 slide PowerPoint presentation that includes: 1 x activity to calculate molar masses 9 x worked examples of basic molar conversions Fun and engaging Did You Know section, which is included in all of my presentations. FREE with the purchase: 15 page practice worksheets. There are three separate activities, with over 2 hours of work. First activity are mass-mole conversions Second activity uses Avogadro's Number for the conversion of atoms and molecules The last activity familiarizes the student with basic molar volume conversions Podcast Episode: My podcast audio file summarizes the material and content. It is a fantastic supplement for students to return to at any time to help reinforce concepts. The podcast is usually 4-6 minutes long, narrated by a spirited and friendly voice with a gentle piano backing track to help lighten an otherwise monotonous subject for many!! This is an excellent lead-in to my Stoichiometry lesson: Please, feel free to review my work, and to leave some feedback. Not only will it help me to improve the quality of my resources, but you will earn more TPT credits as well!