Goldings hops

HFR 3864– Introduction to Brewing Science Exam I
Name: _________________________ SPRING 2021
General Information:
• One lb of DME added to 5 gallons increases specific gravity by 0.0088
• One lb of liquid ME added to 5 gallons increases specific gravity by 0.0074
initial S.G.: 1.040 1.075 1.110 1.135
Boil time:
5 minutes 2.5% 2.25% 2% .18%
10 minutes 5% 4.5% 4% 3.5%
30 minutes 15% 13.5% 12% 10.5%
60 minutes 30% 26.5% 23% 21%
1. Given that 2 oz Kent Goldings hops (6.5% AA) is added at the start of a 60-
minute boil and 2 oz Cascade hops (6.5% AA) are added with 30 minutes
remaining in the boil, and 1 oz of Cascade hops (6.5% AA) is added with 5
minutes remaining in the boil for an ale with OG = 1.075, calculate the anticipated
IBU. (Show your calculation)

2. Explain what a “lager” is. Explain what an “ale is.

3. What is the residue in the bottom of a fermenter at the completion of

4. If your Original Gravity was 1.052 and your final gravity is 1.011, what should
the %Ethanol in your brew be? (Show your calculation)

5. An ale recipe has a target OG of 1.055, but is measured to be only 1.042.
How much DME or LME would you have to add to meet your target? Show your

6. What do the hops that we added in Question 1 contribute to a beer?

7. At the end of the 60-minute boil we cool the kettle with ice water. We transfer
the cooled wort to a fermenter, and then oxygenate it. Why do we do these three

8. In the life cycle of a beer fermenting yeast, there is a time they function in the
presence of oxygen, and a time in which they function in the absence of oxygen.
What are the terms that describe these oxygen conditions and what are the yeast
doing during them?

9. Describe what occurs in a barley grain during the mashing process?

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