ethanol

Question 1

Fermentation

Answer 1

Sugar + yeast (30*C) = ethanol + carbon dioxide + water.

Question 2

1.

Answer 2

Yeast is added to sugar solution and left in 30*C for several days without air.

Question 3

2.

Answer 3

Enzymes in the yeast ferment the sugar into ethanol, carbon dioxide and water.

Question 4

Presence of air

Answer 4

Enzymes produce carbon dioxide and water instead of ethanol.

Question 5

Too high temperature

Answer 5

Enzymes lose their structure and don’t work.

Question 6

Too low temperature

Answer 6

The reaction is too slow.

Question 7

making pure alcohol

Answer 7

As yeast is killed by 15% of alcohol in the mixture, it is impossible to make pure alcohol.

Fractional Destillation (removing water from ethanol, separating components)

Ethanol boiling point - 78*C

Water boiling point - 100*C

Question 8

Fermentation equation

Answer 8

C6 H12 O6(aq) - yeast:30* - 2C2 H5 OH(aq) + 2C O2 (aq)

Question 9

Hydration of ethene

Answer 9

1.Ethene reacts with steam at 300*C, pressure at 60-70 atmospheres.

2. Ethanol is pronounced in liquid form.
3. Unreacted ethene is recycled.

Question 10

Hydration of ethene formel

Answer 10

C2 H4(g) + H2 O(g) - catalyst - C2 H5 OH(g)

Question 11

Oxidation

Answer 11

When ethanol is oxidiesd an acid is produced.