Yeast Fermentation and Gas Measurement

Mr. Kobe conducts an experiment with five flasks containing yeast, sugar, and water at different temperatures. Balloons are attached to capture gases released by the yeast. After an hour, results show that only flasks with warm water and sugar have inflated balloons, indicating gas production. Measurements of balloon circumferences are taken to quantify the results, highlighting the effect of sugar quantity on gas production.

What was added to flask number one?

• 50 ml of warm water, 2 grams of yeast, and 1 gram of sugar

• 50 ml of warm water and 2 grams of yeast

• 50 ml of boiling water, 2 grams of yeast, and 1 gram of sugar

• 50 ml of cold water and 2 grams of yeast

What is the purpose of attaching balloons to the flasks?

• To add weight to the flasks

• To capture gases released by the yeast

• To measure the temperature inside the flask

• To prevent the yeast from escaping

Which flask showed the most balloon inflation after an hour?

• Flask number one

• Flask number two

• Flask number three

• Flask number four

What was the condition of the water in flask number four?

• Room temperature

• Cold with ice crystals

• Warm

• Boiling hot

How much sugar was added to flask number three?

• 1 gram

• 2 grams

• 3 grams

• No sugar

What was the circumference of the balloon on flask number two?

• 18 centimeters

• 22 centimeters

• 26 centimeters

• 30 centimeters

Which flask had the least amount of sugar added?

• Flask number two

• Flask number one

• Flask number four

• Flask number three

What was the main difference between flask two and flask three?

• The amount of yeast

• The type of water

• The type of flask

• The amount of sugar

What was the purpose of measuring the circumference of the balloons?

• To compare the size of the flasks

• To calculate the weight of the yeast

• To determine the volume of gas produced

• To measure the temperature change

Which flasks had no measurable balloon inflation?

• Flask one and two

• Flask two and three

• Flask one, four, and five

• Flask three and four