Chem 121 1st Edition Lecture 6 Outline of Last Lecture I. Ratio Statements as Conversion FactorsII. Problem Solving StrategiesOutline of Current Lecture I. The Mole (chapter 2)II. Molar Mass (chapter 2)III. Wave Nature of Light (chapter 3)IV. Electromagnetic Spectrum (chapter 3)Current LectureThe Mole- An important unit in chemistry- Number of 12C atoms in exact 12 g 12C element- Known as Chemist’s “dozen”o Convenient number for dealing with atoms or molecules- 1 mole (entity) = 6.0221415x1023 (entity)- Conversion factor: 1 mole = Na = 6.022x1023o Function: mole anything number of anythingo Entity: anything as long as there is the same entity on both sides (atoms, ions, molecules, chemical bonds)- Function of Na: makes atoms or molecules identifiable/ measurable by sheer numberMolar Mass- Molar Mass (MM): mass per mole of its entities- Units: g/mol (separate into two units)- When calculating Molar Masso Monatomic: atomic mass with g/molo Polyatomic: sum of atomic mass with g/mol- ** For conversions: 1 mole= MM grams / 1 mole= Na = atoms/molecules/ionso Relate number of entities with their mass- MM- Intensive propertyo MM is unique and can identify elements/ compoundsThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.Wave Nature of Light- Light- Electromagnetic (EM) wave- Wave- a disturbance that travels through space or matter carrying energy - ** Memorize!! o Wavelength (): distance between identical adjacent points on a wave Units: SI: m, nm, pmo Frequency (): number of cycles in a wave per second Unit: Hertz (Hz)o Speed of Wave: c = 3.00x108 m/s- What does LAMBA stand for?Electromagnetic (EM) Spectrum- Electromagnetic Radiation- Nature of Wave: energy---- continuum- Nature of Particle: matter---- fixed quantity and
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