Lecture 2

Lecture 2 - Atoms, Ions Molecules Compounds and Elements...

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Atoms, Ions Molecules Compounds and Elements Chemical Reactions Law of Conservation of Mass Mass percent Avogadro’s Law Law of Definite Proportions Dalton’s Atomic Theory
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For each of the following substances indicate whether it is a compound or element. H 2 ( g ) CaCl 2 ( s ) Na( ) CH 4 ( ) H 2 O( l ) He( ) O 2 ( ) Elements can not be decomposed into simpler substances by chemical or physical processes (elements are made of one kind of atom) Compounds can be broken down into elements by chemical processes
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Sodium metal reacts with chlorine gas to produce sodium chloride (table salt). Write the reaction.
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Experimental Result : Weight of Reactants = Weight of Prod Law of Conservation of Mass In a chemical reaction we can not create or destroy mass.
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Why NaCl (s)? Why not NaCl 2 (s)? Experimental result : NaCl always 60.66 % Cl by mass Calculate : % mass of Cl in NaCl = ? % mass of Cl in NaCl 2 = ?
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and Pressure contain an equal number of particles. What does this mean?
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Lecture 2 - Atoms, Ions Molecules Compounds and Elements...

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