Chem121-Chapter-1_Beekman_SH

Chem121-Chapter-1_Beekman_SH - Chapter 1 Matter and...

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1 Chapter 1 Matter and Measurement © R. Spinney 2010 What is Chemistry? • The Study of MATTER – science that describes the physical properties, composition, structure and reactions of matter. • Chemistry studies the products, amounts, energy and rates of change of reactions. Matter Anything that has mass and occupies space. Atom The smallest building block of matter. * Molecule Groups of atoms held together in a specific connectivity and shape. * In reality atoms are made up of smaller building blocks called protons, neutrons and electrons, (we will learn about these particles in Chapter 2).
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2 What is Chemistry? (cont’d) • Composition – what matter is made of and in what proportions chemical formulas. • Structure – the (3D) arrangement of components of matter in a sample. • Chemical Reactions – involve changes in composition and structure but NOT the destruction of matter What is Chemistry? (cont’d) • Memorization is a part of any science, you need to know the definitions and common variables: you need to know: – Table 1.2 and the first 36, groups 1, 2, 6, 7, 8 element names & symbols - Others will be added as we continue .
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3 Classification of Matter Macroscopic (our world) scale: Gas : No definite volume or shape and is compressible. Liquid : Constant volume, no definite shape, slightly compressible. Solid : Rigid with a definite shape, difficult to compress. Classification of Matter Microscopic (molecular) scale: Gas : Particles are far apart, move at high speed, collide often with itself and other particles. Liquid : Molecules are packed closely together but still moving. The arrangement of molecules is rapidly changing Solid : particles are packed close together, held tightly by strong forces of attraction often in ordered arrangements. Arrangement changes very slowly or not at all.
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4 Types of Pure Substances Elements : only one kind of atom Examples: Oxygen (O 2 ), Gold (Au), Silicon (Si), H 2 , N 2 and the Halogens (F 2 , Cl 2 , Br 2 , I 2 ) Compounds : Two or more elements (different atoms) Examples: NaCl, H 2 O Compounds • Combination of elements in specific ratios. • Compounds have different properties than their
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Chem121-Chapter-1_Beekman_SH - Chapter 1 Matter and...

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