Chapter 01 - CHEMISTRY The Molecular Science Chapter One...

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CHEMISTRY The Molecular Science Chapter One The Nature of Chemistry
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Chemistry Impacts many aspects of our daily lives It seeks to answers a broad range of societal issues Health care – pharmaceuticals Energy – alternative fuels, solar energy, batteries New materials
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Chemistry is a central science Chemical concepts and analytical tools are used by many disciplines: Biology, Environmental sciences, Material sciences and Physics Chemistry is the study of matter and its transformations Matter has mass (m) and volume (V) Chemists describe reactions based upon the properties of atoms or molecules.
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Properties of Matter Properties can be classified as: extensive or intensive physical or chemical qualitative (general descriptions) or quantitative (involves numerical data) Substance – has the same composition and properties throughout the sample (homogeneous)
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Properties of Matter Extensive Properties depends on specific sample under analysis depends on the size of the sample examples: mass, volume Intensive Properties identical in all samples of the substance independent of the size of the sample examples: color, density, melting point, boiling point
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Some Physical Properties Temperature Pressure Mass, volume Physical state Melting point Boiling point Density
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Physical States solid fixed volume and shape liquid fixed volume takes shape of container gas takes shape and volume of container
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Physical Properties can be observed without changing the substances (chemical composition) present in the sample melting point- temperature at which a solid melts ( solid liquid ) boiling point- temperature at which the liquid boils ( liquid gas ) For a pure substance the mp and bp are constant. Used to identify a substance, and/or its degree of purity.
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Physical Changes Changes in physical properties of substances are indicated by: – changes in appearance – changes in physical phase melting point : solid liquid
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Exercise 1.3 Physical Properties and Changes p. 9 Identify each physical property and physical change mentioned in each of these statements, Also identify the quantitative and information given in each statement. a) The blue chemical compound azulene melts at 99 °C. b) The white crystals of table salt are cubic. c)
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Chapter 01 - CHEMISTRY The Molecular Science Chapter One...

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