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Chapter 1

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University of Waterloo
CHEM 120
Sonny Lee

2013-09-13 Matter: Its Properties and Measurements 1-1 The Scientific Method - Natural Laws: are concise statements. Often in mathematical form about natural phenomena. - Hypothesis: is a tentative explanation of a natural law. - Theory: is a model or way of looking at nature that can be used to explain natural laws and make further predictions about natural phenomena. - Scientific Method: is the combination of observation, experimentation and formulation of laws hypotheses and theories. 1-2 Properties of Matter - Matter: is anything that occupies space and displays the properties of mass and inertia. All the objects that we see around us consist of matter, even gases since they have mass. Sunlight however is not matter because it is a form of energy. - Composition: refers to the parts or components of a sample of mater and their relative proportions. - Properties: are those qualities or attributes that we can use to distinguish one sample of matter form others. Physical Properties and Physical Changes - Physical Property: is one that a sample of matter displays without changing its composition. - Physical Change: some of the physical properties of the sample may change, but its composition remains unchanged. (Liquid water → ice, looks different but its chemical composition of oxygen and hydrogen remains the same) Chemical Properties and Chemical Changes - Chemical Change: one or more kinds of matter converted to new kinds of matter with different compositions. - Chemical Property: is the ability (or inability) of a sample of matter to undergo a change in composition under stated conditions. 1-3 Classification of Matter - Matter is made up of very tiny units called atoms. - Each different type of atom is the building block of a different chemical element. - All matter is made up of the 112 elements on the PT. - Compounds: are substances comprising atoms of two or more elements joined together. - Molecules: is the smallest entity having the same proportions of the constituent atoms as does the compound as a whole. - Substances: a group of elements or compounds. - Homogenous Mixture (or solution): a substance that is uniform in composition and properties throughout. The compounds and elements are relatively the same proportion. - Heterogeneous Mixture (or solution): the components separate into distinct regions. Thus, the composition and physical properties vary from one part of the mixture to another. Separatin
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