Lecture 2 CH02 CH03 StudentNotes

Lecture 2 CH02 CH03 StudentNotes - Relationship between...

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Relationship between structure & properties Section 2.17 gases @ 25 o C, 1atm CH 4 - C 4 H 10 Methane ethane propane butane liquids @ 25 o C, 1atm C 5 H 12 - C 17 H 36 pentane - heptadecane solids @ 25 o C, 1atm C 18 H 38 - higher octadecane - higher Physical states of straight chain alkanes ©Kay Sandberg Structure & physical properties Section 2.17 Boiling points -160 o C- 8 9 o 4 2 o C ©Kay Sandberg
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Structure & physical properties Section 2.17 The longer the unbranched chain, the higher the boiling point. 125 o C Boiling point: ©Kay Sandberg Structure & physical properties Section 2.17 36 o C Boiling points of C 5 H 12 isomers: 28 o C 9 o C ©Kay Sandberg The more branched the isomer, the lower the boiling point.
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Structure & chemical properties Section 2.18 Alkanes are relatively unreactive, however. .. Chemical rxn: combustion C n H 2n+2 + X O 2 Y CO 2 + Z H 2 O (CH 3 ) 2 CHCH 2 CH 3 + 8O 2 5CO 2 + 6H 2 O Δ H o = -3529 kJ Δ o = o products - o reactants Heat of combustion o = Heat content or enthaply ©Kay Sandberg Structure & chemical properties Section 2.18 (CH 3 ) 2 CHCH 2 CH 3 + 8O 2 5CO 2 + 6H 2 O Δ o = -3529 kJ Δ o = o products - o reactants The longer the chain in a homologous series the more negative the Δ o . exothermic ©Kay Sandberg
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Structure & chemical properties Section 2.18 8CO 2 + 9H 2 O C 8 H 18 + O 2 25 2 Heat of combustion kJ/mol 5471 5466 5458 5452 least stable most stable ©Kay Sandberg Structure & chemical properties Section 2.18 The more branched the isomer alkane the more stable.
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Lecture 2 CH02 CH03 StudentNotes - Relationship between...

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