chapter 3 - Matter Matter has mass and occupies space...

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Unformatted text preview: Matter Matter has mass and occupies space Phases of matter are solid, liquid and gas. Recall (Tin disease, graphite and diamond) that there may be more than one solid phase. Matter may be elements (not reducible to simpler substances) or compounds. Matter may be homogeneous or heterogeneous. Matter has both physical and chemical properties. It can be changed physically or chemically. WATER 6 Structure Determines Propertie the atoms or molecules have different structures in solids, liquid and gases, leading to different properties Copper a Pure Substance color brownish red shiny, malleable and ductile excellent conductor of heat and electricity melting point = 1084.62C density = 8.96 g/cm 3 at 20C Brass a Mixture Type Color % Cu % Zn Densit y g/cm 3 MP C Tensile Strengt h psi Uses Gilding reddis h 95 5 8.86 1066 50K pre-83 pennies, munitions, plaques Commercia l bronze 90 10 8.80 1043 61K door knobs, grillwork Jewelry bronze 87.5 12.5 8.78 1035 66K costume jewelry Red golden 85 15 8.75 1027 70K electrical sockets, fasteners & eyelets Low deep yellow 80 20 8.67 999 74K musical instruments, clock dials Cartridge yellow 70 30 8.47 954 76K car radiator cores Common yellow 67 33 8.42 940 70K lamp fixtures, bead chain Muntz yellow 60 40 8.39 904 70K nuts & bolts, Classification of Matter Pure Substance = all samples are made of the same pieces in the same percentages salt Mixtures = different samples may have the same pieces in different percentages salt water Pure Substance Constant Composition Homogeneous Mixture Variable Composition Matter Classification of Mixtures homogeneous = matter that is uniform throughout appears to be one thing every piece of a sample has identical properties, though another sample with the same components may have different properties solutions (homogeneous mixtures) heterogeneous = matter that is non-uniform throughout contains regions with different properties than other 11 Pure Substances vs. Mixtures Pure Substances all samples have the same physical and chemical properties constant composition = all samples have the same pieces in the same percentages homogeneous separate into components based on chemical properties temperature usually stays constant while melting or boiling Mixtures different samples may show different properties variable composition = samples made with the same pure substances may have different percentages homogeneous or heterogeneous separate into components based on physical properties temperature changes while melting or boiling because composition Classifying Pure Substances Elements and Compounds Substances which can not be broken down into simpler substances by chemical reactions are called elements Most substances are chemical combinations of elements. These are called compounds ....
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This note was uploaded on 04/11/2008 for the course CHE 101 taught by Professor Churchhill during the Fall '08 term at SUNY Buffalo.

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chapter 3 - Matter Matter has mass and occupies space...

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