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Food Chemistry > Water > Flashcards

Water Flashcards

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1
Q

Water Molecule

A

A polar (+ and - charges arranged so as to have directional pull) covalently bonded compound contains 2 Hydrogens and 1 Oxygen

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2
Q

Sucrose + Water =

A

molecular state

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3
Q

Salt + Water

A

Ionic State

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4
Q

Dielectric Constant measures

A

the relative effect of the medium on the force with which two oppositely charged plates attract each other

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5
Q

Structure of Ice

A

Tetrahedral hydrogen bonding around a water molecule

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6
Q

*What instrument is used to determine the calorie of foods

A

Bomb Calorimeter

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7
Q

Forms of water

A

Liquid, Solid, Gas

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8
Q

Molecular Weight of Water

A

18

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9
Q

Electron Arrangement: Water

A

Electrical asymmetry
No overall net charge
Electrical dipole

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10
Q

pH =

A

-log[H+]

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11
Q

Water Activity

A

how much water is readily available to cause a chemical reaction

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12
Q

Non-polar molecule

A

electrically neutral: contains an equal amount of +/- charges

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13
Q

Surfactant

A

reduces surface tensions

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14
Q

All molecules attract due to

A

London Dispersion Forces

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15
Q

Dipole-ion Interactions

A

+ Solutes
+ Proteins

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16
Q

Dipole-dipole Interactions

A

+ Protein
+ Carbohydrates

17
Q

SCFE

A

Super Critical Fluid Extract

18
Q

Sublimation

A

Solid (ice) changes to gas (vapor)

19
Q

Archimedes Theory

A

Water Displacement

20
Q

Molar system [M]

A

the gram molecular (1 mole) weight of solute in a liter of a solution

21
Q

Molal system [m]

A

the gram molecular weight of solute in 1 kg of solvent

22
Q

Percent by weight

A

the grams of solute present in 100g of solution (w/w)

23
Q

Percent by volume

A

the grams of solute in 100ml of solutions (w/v)

24
Q

Normal system [N]

A

the gram equivalent weight of a material in 1 L of solution

25
Q

Normality

A

how many hydrogen are available for a chemical reaction

Food Chemistry (6 decks)

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