making bread

Question 1

what is needed to make bread rise?

Answer 1

yeast

Question 2

where yeast respires a———-, it produces CO2, which helps the bread to rise

Answer 2

anaerobically
because of the co2 bubbles

Question 3

aerobic respiration word equation

Question 5

explain the steps of making bread:

Answer 5

• a bread is made using water, yeast, flour, sugar
  —> then the bread needs to rise
• enzymes turn the carbohydrates in the flour into sugars
• these sugars are used in aerobic respiration
• then the oxygen runs out
  ANAEROBIC respiration starts (fermentation) producing carbon dioxide and ethanol
• the co2 is trapped as gas bubbles, causing the bread to rise
• the temperature will change enough to kill the yeast

Question 6

anaerobic respiration equation

Answer 6

glucose (C6H12O6) –> ethanol + carbon dioxide (CO2)

Question 7

although ethanol is produced, why is bread not alcoholic?

Answer 7

the alcohol is boiled away by the high temperatures