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MATTER

What is Chemistry?. Chemistry

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MATTER

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    1. MATTER

    2. What is Chemistry? Chemistry – the study of matter, its structure, properties, and composition, and the changes that matter undergoes

    4. View GPB Episode 201 Physical and Chemical Properties and Changes

    13. Intensive and Extensive Properties Extensive Properties depend on how much of a particular sample is on hand Intensive Properties do not depend on how much sample is present

    14. Density The amount of stuff in a given space Density is a ratio of mass to volume Density = Mass Volume

    15. Problems Calculate the density of a material that has a mass of 52.457g and a volume of 13.5 cm3. D = 53.457g = 3.96 g/cm3 13.5cm3 How many grams of tin would occupy 5.5 cm3, if it has a density of 7.625 g/cm3? 7.625 g/cm3 = X X = 42 g 5.5cm3 Pure gold has a density of 19.32 g/cm3. How large would a piece of gold be if it had a mass of 318.97grams? 19.32 g/cm3 = 318.97g X = 16.51 cm3 X

    19. Watch GPB Video 202 Classification of Matter

    20. Classification of Matter All matter can be put into two categories; pure substances and mixtures

    21. Pure Substances All samples have the same properties or characteristics and have identical composition They cannot be separated by physical methods Elements and Compounds are pure substances

    22. Element

    23. Elements in Nature

    24. Diatomic Elements Are always bonded to themselves in free state (ex: O2)

    25. Compounds

    26. Mixtures a blend of two or more substances that are not chemically combined Salt water or Air

    27. Characteristics of Mixtures

    28. Homogenous Mixture components are uniformly dispersed (same throughout). Often referred to as Solutions Ex: Salt water or air

    29. Heterogeneous Mixture components are not uniformly dispersed (different). Ex: Pile of Salt and Pepper

    33. Matter Test Basics of 3 Phases of Matter Physical/Chemical Properties & Changes Law of Conservation of Matter Density Calculations Intensive/Extensive Properties Distinguish Between Pure Substances & Mixtures Elements: Properties Compounds: Properties Mixtures: Properties Distinguish Between Homogeneous/Heterogeneous Mixtures

    34. States (Phases) of Matter What are the general properties of the three states of matter?

    35. SOLID Holds its shape Has a definite volume Particles are in fixed positions

    36. LIQUID Has a definite volume Takes the shape of its container

    37. GAS Has no definite shape or volume Expands to fill its container Easily compressed

    38. Properties set of characteristics by which the substance is recognized

    39. Physical Properties observed without altering the identity of the substance

    40. Chemical Properties Can only be observed by altering the composition of a substance

    41. Changes in Matter

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