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UNIT 2 NATURE’S CHEMISTRY
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hydroxyl
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The shortened structural formula
for an organic compound is CH3CH(CH3)CH(OH)C(CH3)3 Which of the following is another way of representing this structure?
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A Cn Hn+4 N B Cn H2n+3 N C Cn H3n+2 N D Cn H4n+1 N CH5N C2H7N C3H9N
The first four members of the amine homologous series are: What is the general formula for this homologous series? A Cn Hn+4 N B Cn H2n+3 N C Cn H3n+2 N D Cn H4n+1 N CH5N C2H7N C3H9N C4H11N
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C4H6 C5H8 C6H10
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What is meant by the term isomer?
ISOMERS What is meant by the term isomer? SAME MOLECULAR FORMULA BUT DIFFERENT STRUCTURAL FORMULAE
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ADDITION
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OH H H OH
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BROMINE DECOLOURISED Both compounds are unsaturated.
Describe the chemical test for unsaturation. BROMINE DECOLOURISED
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Name the functional group
CARBOXYL CARBOXYL HYDROXYL
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C3H8S H8C3S SH8C3 SAME MOLECULAR FORMULA BUT
DIFFERENT STRUCTURAL FORMULAE
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EXOTHERMIC Eh = cmΔT 4·18 x 0·1 x = 3·344 kJ
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6·4 g of methanol (CH3OH) raises the temperature of 100cm3 of water from 21 °C to 40 °C
Calculate the energy, in kJ, absorbed by the water. Eh = cmΔT 4·18 x 0·1 x = 7·942 kJ
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Eh = cmΔT 4·18 x 0·2 x = 33·44
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In one experiment the burning of ethanol
resulted in the temperature of 400cm3 of water rising from 14oC to 30oC. Calculate the energy absorbed by the water. Eh = cmΔT 4·18 x 0·4 x = 26·75 kJ
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In one experiment the burning of methanol resulted in the temperature of 100 cm3 of water rising from 19 oC to 59 oC. Calculate the energy released. Eh = cmΔT 4·18 x 0·1 x = 16·72 kJ
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1 mole 1 mole 12 + (1x4) 12 + (16x2) 16g 44g 11g 44 x 0·25 = 4g
Calculate the mass of carbon dioxide produced when 4g of methane burns completely. CH O CO H2O 1 mole mole 12 + (1x4) (16x2) 16g g 11g 4g 44 x 0·25 = 4/16 = 0·25
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1 mole 1 mole 12 + (1x4) 12 + (16x2) 16g 44g 1g 44/16 = 2·75g 4g
Calculate the mass of carbon dioxide produced when 4g of methane burns completely. CH O CO H2O 1 mole mole 12 + (1x4) (16x2) 16g g 1g 44/16 = 2·75g 4g 4 x 2·75g = 11g
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