Compounds Flashcards

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1
Q

What is the most prevalent of the acids found in grapes and wine

A

ethyl alcohol

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2
Q

True or False: Water makes up 80 - 90% of the volume of most wines

A

true

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3
Q

Which components of wine can give thick or slow-running legs?

A

high levels of alcohol, or sugar

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4
Q

What are the 2 secondary types of alcohol? AKA Fusel Alcohols?

A

methanol and glycerol

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5
Q

A sharp-tasting acid often associated with green apples

A

malic

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6
Q

an acid produced via the conversion of malic acid

A

lactic

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7
Q

an acid with a slightly bitter, slightly salty flavor

A

succinic

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8
Q

the acid found in most types of vinegar

A

acetic

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9
Q

of the six main acids found in wine, list those that are typically found in unfermented grapes

A

malic, tartaric, succinic, citric

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10
Q

of the acids typically found in grapes, which are found in very small quantities

A

citric, succinic

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11
Q

which acid is known to cause deposits known as wine diamonds?

A

tartaric (tartrates)

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12
Q

what is the name of the winemaking process that, in addtion to changing a wine’s acid compoenents, often provides wines with a creamy texture and a buttery aroma?

A

malolactic fermentation

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13
Q

what measurement is used to define the volume of all acids present in a wine?

A

TA

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14
Q

what does pH measure?

A

the combined chemical strength of all acids present

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15
Q

what is a typical pH range of wine

A

2.9-3.9

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16
Q

true or false: the lower the pH, the lower the acid?

A

False

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17
Q

What are the 2 fermentable sugars found in grapes?

A

fructose and glucose

18
Q

what term is used to describe a wine that does not contain any detectable sugar? Describe the process that makes a wine not sweet?

A

Dry. The yeast cells consume all of the sugar.

19
Q

What are the yellow pigments found in wine?

A

flavonols

20
Q

true or false: the flavor compound vanillin is found in oak barrels?

A

true

21
Q

a compund found in wine believed to be beneficial to human health?

A

resveratrol

22
Q

the compounds that give red wine its color

A

anthocyanins

23
Q

molecules that result form the joining of an acid and an alcohol

A

esters

24
Q

what is the process that causes sediment to form in wines?

A

polymerization

25
Q

what is a common preservative used in wine making?

A

sulfur

26
Q

compound that forms when wine is exposed to air

A

aldehydes

27
Q

what gas promotes the release of the wine’s aromatic compounds?

A

carbon dioxide

28
Q

true or false: flavonols increase in white grapes with increased exposure to sunlight

A

true

29
Q

true or false: the phenolic comounds of a grape are found primarily in its skin and seeds

A

true

30
Q

true or false: ethyl acetate imparts an aroma similar to nail polish remover at very low concentrations, and a floral aroma at high concentrations

A

false

31
Q

true or false: wines with greater than 2 ppm of sulfur dioxde are required to display the “contains sulfites” warning on the label

A

flase–10ppm

32
Q

what compound is the root cause of cork taint?

A

TCA; Trichloroanisole

33
Q

what substance can cause a wine to smell like rancid butter?

A

butyric

34
Q

what faulty wine aroma can be caused by incomplete malolactic fermentation?

A

geranium

35
Q

what is the term used to describe a wine that has a cooked or baked odor?

A

Maderized

36
Q

what wine fault is typically caused by hight amounts of both acetic acid and ethyl acetate?

A

volatile acidity

37
Q

what substance can cause a wine to smell like onions or garlic?

A

mercaptan

38
Q

what aroma can be caused by an excess of ethyl acetate?

A

nail polish remover

39
Q

what wine fault can be described as having the aroma of burnt matches?

A

sulfur dioxide

40
Q

what wine fault is often described as similar to rotten eggs?

A

hydrogen sulfide

41
Q

what off-odor is caused by acetic acid?

A

vinegar