Card 301
Question
In chemistry, what is a mixture of of two liquids with the same constant boiling point and composition throughout distillation called?
Answer
Azeotrope
Food Chemistry
Discover Food Chemistry: 945 flashcards with questions and answers.
- Subject
- Sciences / Chemistry
- Language of creation
- English
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Cards in this set
Card 302
Question
What is the common name for sodium bicarbonate?
Answer
Baking soda
Card 303
Question
What color are anthocyanins at Basic and Acidic pH?
Answer
Basic=Blue; Acidic=red
Card 304
Question
Why do O-H covalent bonds have partial ionic character?
Answer
Because the oxygen molecule is highly electronegative
Card 305
Question
Potassium sorbate is primarily used as a food preservative. Why is it used more than its acid form, sorbic acid?
Answer
Because the salt is more soluble in foods than the acid.
Card 306
Question
Why does water have a high dielectric constant?
Answer
Because water molecules form extensive hydrogen-bonding networks that enable strong dipole interactions and proton transport.
Card 307
Question
What is the characteristic fruit flavor compound of cherry?
Answer
Benzaldehyde
Card 308
Question
What is the function of benzoate in food?
Answer
Benzoate acts as a preservative by inhibiting the growth of mold, yeast, and some bacteria.
Card 309
Question
What is the effect of pH on benzoate mechanisms and effectiveness as a food additive?
Answer
Benzoate is most effective at a pH below 4.5, where it exists in its undissociated form.
Card 310
Question
What is the major whey protein in milk?
Answer
Beta lactoglobulin (about 65%)
Card 311
Question
Name 2 carotenoid pigments.
Answer
Beta-carotene, Lutein, Zeaxanthin, Lycopene, Alpha-carotene, Fucoxanthin, Astaxanthin, Violaxanthin, Neoxanthin, Capsanthin
Card 312
Question
What is the chemical name of enzyme lactase?
Answer
Beta-D-galactosidase
Card 313
Question
Name two betalains and describe their colors.
Answer
Betacyanins (reddish to violet) and betaxanthin (yellowish to orange)
Card 314
Question
What is the main pigment found in beets?
Answer
Betalain
Card 315
Question
At what range of temperatures do most proteins denature?
Answer
Between 40-80°C.
Card 316
Question
What is the name of the main carotenoid pigment responsible for the color of annatto?
Answer
Bixin
Card 317
Question
What pigment was first designated as anthocyanins?
Answer
Blue pigment in flowers
Card 318
Question
Is boiling endothermic or exothermic?
Answer
Boiling is endothermic
Card 319
Question
What is the difference between a "dextrin" and a "dextran"?
Answer
Both are intermediate length carbohydrate chains composed of glucose units. Dextrins are formed by acid or enzymatic hydrolysis of starch; dextrans are synthesized by microorganisms
Card 320
Question
What happens to both the coordination number and distance between nearest neighbor molecules during the transtion from ice to water?
Answer
Both increase
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