Lacey_Che131_F2011_Lect-1s

Lacey_Che131_F2011_Lect-1s - Lec-1: Properties of matter...

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Lec-1: Properties of matter 1 Roy A. Lacey, Stony Brook University; Che 131, Fall 2011 Chemistry Chemistry is the science of matter: 9 its composition structure and properties its composition, structure, and properties 9 Measurements involve the change that matter undergoes and the energy associated with this change ¾ It is one pillar of the natural sciences necessary It is one pillar of the natural sciences necessary for detailed studies in the physical sciences or engineering ¾ It is a valuable way to view our material world, to interpret it, and to change it. 2 Roy A. Lacey, Stony Brook University; Che 131, Fall 2011
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What is matter? ± Matter is what makes up all substances. ¾ Molecules, atoms and sub-atomic particles ± The major properties of matter is that it takes up space, has mass and attracts other matter with gravity. ¾ mass is a very fundamental property (like distance mass is a very fundamental property (like distance and time), so it can only be defined indirectly Variations of matter: FM a = ¾ Antimatter: mirror images of common subatomic particles that have the opposite electrical charge and sometimes opposite spin ¾ Dark matter: Astronomical measurements indicate that some galaxies have more mass than is 3 Roy A. Lacey, Stony Brook University; Che 131, Fall 2011 observed -- (that can not be seen)? Atoms The electrons are situated at comparatively large distances (compared to nuclear dimensions) around the nucleus The fundamental structural blocks of substances are the atoms Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 4 Elements
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Classification of Matter Substances with one type of atom Elements Basic building block For all substances Atoms Mixtures Compounds Substances with two or more different Substances with two or more different atoms chemically combined 5 Roy A. Lacey, Stony Brook University; Che 131, Fall 2011 Elements and compounds have a definite makeup and definite properties . Elements only one kind of atom; atoms Compounds two or more kinds substance with definite Mixtures two or more substances two or more are bonded if the element is diatomic or polyatomic of atoms that are bonded makeup and properties that are physically mixed kinds There are clear distinctions between elements, compounds and mixtures Roy A. Lacey, Stony Brook University; Che 131, Fall 2011 6 Æ Be sure to know them
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Chemical & Physical Change A Physical changes does not cause a substance to become a A Chemical change causes a substance to change into fundamentally different substance something entirely new
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This note was uploaded on 11/18/2011 for the course CHE 131 taught by Professor Kerber during the Spring '08 term at SUNY Stony Brook.

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Lacey_Che131_F2011_Lect-1s - Lec-1: Properties of matter...

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