Lec1 - 3 Roy A. Lacey, Stony Brook University; Che 131,...

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Unformatted text preview: 3 Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 Lec-1: Properties of matter 4 Chemistry is the science of matter: 9 its composition, structure, and properties 9 Measurements involve the change that matter undergoes and the energy associated with this change It is a valuable way to view our material world, to interpret it, and to change it. Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 Chemistry 5 Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 What is matter? Matter is what makes up all substances. Molecules, atoms and sub-atomic particles The major properties of matter is that it takes up space, has mass and attracts other matter with gravity. mass is a very fundamental property (like distance and time), so it can only be defined indirectly F Ma = Variations of matter: Antimatter: mirror images of common subatomic particles that have the opposite electrical charge and sometimes opposite spin Dark matter: Astronomical measurements indicate that some galaxies have more mass than is observed -- (that can not be seen)? 6 Matter Classification Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 MATTER Can it be physically separated? Homogeneous Mixture (solution) Heterogeneous Mixture Compound Element MIXTURE PURE SUBSTANCE yes no Can it be chemically decomposed? no yes Is the composition uniform? no yes Colloids Suspensions Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 7 Matter Classification Familiar substances fit well in this classification 8 Roy A. Lacey, Stony Brook University; Che 131, Fall 2010 An element is the simplest kind of material with unique physical and chemical properties Pure Substances A compound is a substance that consists of two or more elements linked together in definite proportions A given compound always contains the same, fixed ratio of elements....
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Lec1 - 3 Roy A. Lacey, Stony Brook University; Che 131,...

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