Chemistry - 4CH1 PearsonEdexcel

Alcohols

Gbogbo ọrọ náà

Alcohols are among the most versatile organic compounds. Ethanol alone serves as a fuel, a solvent, a drink ingredient, and a feedstock for making other chemicals. What gives this family its identity is a single functional group - the hydroxyl group, -OH - attached to a carbon chain.

In this lesson you will learn how to name and draw the first four alcohols, explore the three ways ethanol can be oxidised, and compare the two industrial routes for manufacturing ethanol: hydration of ethene and fermentation of glucose. These are high-yield specification points that Edexcel tests regularly.

Ebumnobi

know that alcohols contain the functional group −OH
understand how to draw structural and displayed formulae for methanol, ethanol, propanol (propan-1-ol only) and butanol (butan-1-ol only), and name each compound the names propanol and butanol are acceptable
know that ethanol can be oxidised by: - burning in air or oxygen (complete combustion) - reaction with oxygen in the air to form ethanoic acid (microbial oxidation) - heating with potassium dichromate(VI) in dilute sulfuric acid to form ethanoic acid
know that ethanol can be manufactured by: - reacting ethene with steam in the presence of a phosphoric acid catalyst at a temperature of about 300 ºC and a pressure of about 60-70 atm - the fermentation of glucose, in the absence of air, at an optimum temperature of about 30 ºC and using the enzymes in yeast
understand the reasons for fermentation, in the absence of air, and at an optimum temperature

Akọmọ Ojú-ẹkọ

When most people hear the word 'alcohol' they think of drinks. But to a chemist, alcohol is a whole family of molecules united by the -OH group. Methanol powers racing cars, ethanol is the world's most widely used biofuel, propanol dissolves nail varnish, and butanol is a promising next-generation fuel. Understanding their chemistry opens doors across the specification.

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Ayẹwo Ẹkọ

Ekele diri gi maka imecha ihe karịrị na Alcohols. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.

Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.

Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.

What is the functional group in alcohols? A) -COOH B) -OH C) C=C D) -CHO Answer: B
What colour change is observed when ethanol is heated with acidified potassium dichromate? A) Green to orange B) Orange to green C) Blue to colourless D) Purple to colourless Answer: B
Fermentation of glucose requires: A) Excess oxygen and high temperature B) Yeast, absence of air, and about 30 degrees Celsius C) A phosphoric acid catalyst D) High pressure and a platinum catalyst Answer: B
What is the structural formula of ethanol? A) CH3OH B) CH3CH2OH C) CH3CH2CH2OH D) CH3COOH Answer: B
Which of these is NOT a use of alcohols? A) Fuel B) Solvent C) Road surfacing D) Making vinegar Answer: C