c6.1.5 making ethanol Flashcards

1
Q

what are the two ways ethanol can be made

A

Fermentation and hydration of ethene

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2
Q

fermentation equation

A

C6H12O6 (aq) –> 2CO2 (g) + 2C2H5OH (aq)

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3
Q

Temperature for fermentation

A

usually 35 degrees

enzymes stop working at 50 degrees

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4
Q

hydration of ethene formula

A

C2H4 (g) + H2O (l) <=> C2H5OH (l)

change in energy= -45 kj/mol

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5
Q

Temperature for hydration of ethene

A

300 degrees

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6
Q

Pressure for hydration of ethene

A

60 atm

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7
Q

Is a catalyst needed for hydration of ethene

A

yes- phosphoric acid catalyst

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8
Q

method for fermentation

A
  1. mix glucose solution and yeast in a conical flask
  2. attach a bung with a straw
  3. put the other end of the straw into a test tube with limewater
  4. limewater should turn cloudy if CO2 is present
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