Unit1ChemistrySpeak

Unit1ChemistrySpeak - - 1 - CHEMISTRY SPEAK The Language...

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Unformatted text preview: - 1 - CHEMISTRY SPEAK The Language and Laws of Chemistry $ So what is chemi stry , exactl y? My favorite answer to that is ¡What in the world isn¢t chemistry?£ $ Chemist ry is the study of matter with respect to its composition, characteristics and the transformations it undergoes. $ Another questio n. What is matter? $ Matter is anything that has mass and occupies space. $ Animal, vegetab le or mineral; all these are matter; we humans are matter. $ So is the air we breathe and the water we drink. $ Is there anything that isn¢t matter? Energy; such as heat, light and electricity is not matter. $ Energy is important though; almost all of the changes that matter can undergo are accompanied by either a gain or loss of energy. Properties of Matter $ The term ¡ property £ describes the characteristics of a substance that can be used to distinguish it from another substance. $ Physical properties are characteristics that can be observed; colour, taste, size, physical state, boiling point and melting point are all physical properties. $ Chemical properties are characteristics which describe how a substance undergoes changes (or not!) to form a different substance; a colour change could indicate a chemical change. - 2 - Physical States of Matter $ Three states exist for matter: solid, liquid and gas. $ These can be classified as to whether its has a definite or indefinite shape or volume. $ A SOLID has a definite shape and a definite volume . $ A solid always has the same shape and volume, no matter where it is. $ A LIQUID has an indefinite shape , but a definite volume . $ A liquid will always takes the shape of the container that it is in, to the extent that it fills the container. $ A GAS has an indefinite shape and an indefinite volume . $ A gas always completely fills the container; taking its volume and shape. $ The observed state of matter depends on the temperature and pressure when the observation is made. $ The ¡natural¢ state of a particular substance is the one that we commonly observe, but almost all matter can exist in any of the three states if the conditions (temperature and pressure) are appropriate. CLASSIFICATION OF MATTER $ Before we can begin to study matter, it is important to realize that within all ¡matter¢ there are some subgroups, or classifications. MATTER PURE SUBSTANCES- 3 - MIXTURES ELEMENTS COMPOUNDS HETEROGENEOUS MIXTURES HOMOGENEOUS MIXTURES $ All matter can be classified according to the above scheme. $ We will now look at each of these categories in more detail. PURE SUBSTANCES- 4 - $ Any given amount (often called a sample ) of a pure substance contains only that substance. $ All samples of a pure substance will have the same properties (both physical and chemical) under identical conditions (meaning things like temperature)....
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This note was uploaded on 10/23/2011 for the course CHEMISTRY 1027 taught by Professor Calvin during the Fall '10 term at UWO.

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Unit1ChemistrySpeak - - 1 - CHEMISTRY SPEAK The Language...

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