5.5 Ethanol Flashcards
Why can ethanols formula sometimes be written as C2H5OH?
Because the OH makes it easier to spot that it is an alcohol
What type of hydrocarbon is ethanol?
Alcohol
How can we make an alcohol from an alkane?
Alkane –(cracking)–> alkene –(add oxygen)–> alcohol
What is a solvent?
Something that dissolves something else
Give an example of a solvent
Water is a solvent for salt
Name 4 uses of ethanol
- can be drunk
- a good solvent
- used in perfumes
- used in fuels
Name the 2 processes that can produce ethanol
- fermentation
* hydration
How is ethanol produced by the fermentation of sugar from plants using yeast?
Enzymes in the yeast cause the sugar to break down into ethanol and carbon dioxide
Give the word equation for the fermentation of sugar to get ethanol
Glucose –> ethanol + carbon dioxide
How can ethanol be made by hydration?
React ethene vapour and steam at high temperatures and pressure using a catalyst
Write a word equation for the hydration of ethene
Ethene + steam –> ethanol
What type of resource is used in the fermentation of sugar to get ethanol?
A renewable source, sugar from plants
What temperature is fermentation done at?
Room temperature
What type of solution can fermentation only produce?
A dilute aqueous solution of ethanol
What is the next step after fermentation to get pure ethanol?
Fractional distillation
