CHM 1210 1st Edition Lecture 2Outline of last LectureI. Matter and Energya. States of matterb. Forms of Energyc. Classes of MatterOutline of Current LectureII. Matter and Energy (con)c. Classes of Matterd. Property of matterCurrent Lecture1.3 Classes of Matter Classes of compounds oMolecular compounds = compounds whose particles are molecules made of non metals__ oIonic compounds = compounds whose particles are __positive(Cations) and negative (Anions) of metal and a non-metal__oLaw of Constant Composition: All samples of a particular compound contain the same elements combined in the same proportions___. Example: water (H2O) oConsists of _2_ units of hydrogen (H) combined with _1_ unit of oxygen (O) oElements and proportions represented by chemical formula Definition: Chemical formula = a notation for representing the elemental composition of a pure substance using the symbols of the elements; subscripts indicate the relative number of atoms of each element in the substance. Elements: Hydrogen (H2) and Oxygen (O2) Classes of mixtures oHomogeneous mixtures oAlso known as solutions___, its components are distributed _uniformly and evenly_ throughout the sample and have no visible boundaries or regions. oHeterogeneous mixtures oComponents are _NOT_ distributed uniformly, and contains distinct regions of different composition. Example: Immiscible liquids = combination of liquids that are incapable of __Mixing with or dissolving in each other (e.g. water and oil)__ These 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.Obs: Mixtures can be separated based on the different physical properties of the components Different Physical Properties Technique Boiling Point DistillationState of Matter (solid/liquid/gas) filtrationAdherence to a Surface chromatographyVolatility EvaporationDensity centrifugation 1.4 Properties of Matter Definitions: oIntensive property = a property that is _Independent of the amount of substance present Examples: Boiling point, melting point, temperture, color, hardness, pressure and weight oExtensive property = a property that is _Dependent_ of the amount of the substance present Examples: _volume, mass, length, total charge_ oPhysical property = a property of a substance that can be observed without changing it into another substance Examples: Melting point, color, temperture oChemical property = property of a substance that can be observed only by reacting it to form another substance Examples: __Rusting of iron__ Definition: • Density = a measure of how tightly packed the particles in a substance are massdensity = volumeIs density an intensive or extensive property?