exp 2.9 to prepare and show the production of alcohol by yeast

Question 1

draw a large labelled diagram representing the set up of this experiement

Question 2

what components are used in the experiement

Answer 2

boiled glucose and yeast

Question 3

what components are used in the aerobic control

Answer 3

fresh glucose and yeast

Question 4

suggest a suitable control for this experiment

Answer 4

boiled glucose and boiled yeast

Question 5

why is the yeast boiled

Answer 5

removes oxygen- anaerobic

Question 6

how do we ensure this takes place under anaerobic conditions

Answer 6

boil glucose for 5 minutes

Question 7

what is the constant in this experiment

Answer 7

temperature

Question 8

how is the temperature kept constant

Answer 8

water bath at 30 degrees

Question 9

how do we prevent oxygen from entering the solution

Answer 9

layer of oil

Question 10

how do we test for the presence of CO2

Answer 10

limewater turns milky indicating the production of CO2

Question 11

how do we test for the presence of alcohol

Answer 11

filter the solution to remove yeast
add equal parts potassium iodide and sodium hypochlorite
heat at 60 degrees for 4-5 min- yellow crystals form indicating presence of ethanol

Question 12

what is another name for the presence of alcohol test

Answer 12

iodoform test