Lect 1 Into, Matter and Measurement-2010

Lect 1 Into, Matter and Measurement-2010 - CHEMISTRY The...

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CHEMISTRY The Study of Matter, its Structure, Properties and Reactions
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What is matter? The “stuff” of the universe Anything that has mass and occupies space
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Properties of Matter Physical Properties Physical Changes Chemical Changes Composition of Matter Solids / Liquids / Gases Energy changes associated with chemical and physical change Elements / Compounds Mixtures Chemical Properties
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Properties of Matter Physical properties : color, shape, electrical conductivity, melting point, density…. . stand alone properties Chemical properties : corrosiveness, flammability, reactivity with acids ….. properties dependent on interactions with other substances . . i.e. on chemical changes
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Chemical and Physical Change Physical Change involves a change in physical properties or characteristics of matter that does not involve a change in its chemical properties or identity ( i.e. it involves a change in its state (solid, liquid or gas) ice (solid) water (liquid) (melting) alcohol (liquid) alcohol (vapor) (evaporation)
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Chemical Change (chemical reaction) is a process in which matter, in one or more forms, is transformed into a new kind of matter, in one or more different forms. iron and oxygen iron oxide (rust) hydrogen and oxygen → water glucose and oxygen → carbon dioxide and water
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Physical changes alter physical form of a substance but not its chemical composition water (ice) → water (liquid) → water (steam) solid carbon dioxide (“ dry ice”) → carbon dioxide (gas) Chemical changes convert a substance into a different substance water → hydrogen + oxygen carbon dioxide → carbon + oxygen
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Physical States of Matter Solid ↔ Liquid ↔ Gas water (ice) → water (liquid) → water (steam) Temperature and pressure dependant Physical changes can usually be reversed by a temperature reversal
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Representation of a solid fixed shape that does not conform to the container shape
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Representation of a liquid fixed volume/no fixed shape shape conforms to the container shape
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Representation of a gas shape conforms to the container shape and occupies all its volume
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Matter. Any material which has mass and occupies space Physical States (temperature and pressure dependent) ___________________________________ Solid fixed shape and volume Liquid fixed volume / no fixed shape Gas has shape and volume of space that it occupies ____________________________________ Solids and liquids are incompressible Gases are readily compressible
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Page. 35.1 Atomic-scale views
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Page. 38.5 (i) How many different chemical changes occur? (ii) How many different physical changes occur?
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(i) Which show(s) a physical change? (ii) Which show(s) a chemical change?
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Lect 1 Into, Matter and Measurement-2010 - CHEMISTRY The...

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