CfE Higher Chemistry - Unit 2: Nature's Chemistry - Chemistry of Cooking and Oxidation of Food

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CfE Higher Chemistry - Unit 2: Nature's Chemistry - Chemistry of Cooking and Oxidation of Food
scarlettjaynem
Flashcards by scarlettjaynem, updated more than 1 year ago
scarlettjaynem
Created by scarlettjaynem almost 10 years ago
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Question Answer
Why are volatile molecules important for flavour? They are not freed until the cell walls are broken in cooking
Name 2 oil-soluble funtional groups Alkene C=C Phenyl (C6H5)
Name 2 water soluble functional groups Carbonyl C=O l H Ester Link
Why do proteins change shape when heated? Heat breaks intermolecular bonds
Functional Group present in Alcohols? Hydroxl (-OH)
What is the difference between primary, secondary and tertiary alcohols? Primary - No more than one carbon is bonded to that bonded to the OH group Secondary - No more than two (mid chain) "2/3-ol" Tertiary - three "methyl........ 2/3-ol"
What is a cycloalkanol? Secondary alcohols in a ring structure
Oxidation of Primary alcohol forms: an aldehyde and water
What is an aldehyde? Functional group: CHO occuring at the end of the chain Example: ethanAL
Oxidation of Aldehyde forms: Carboxyllic Acid
Oxidation of a Secondary alcohol forms: Ketone
What is oxidation? Loss of Hydrogen or gain of oxygen ina molecule
What oxidising agent is used to oxidise primary and secondary alcohols and what colour change is shown? Acidifies potassium dichromae orange -> green
What is a ketone? Funtional group: CO occurs within chain Example: hexan-3-ONE
Benedict's Solution colour change: Blue -> Red presence of aldehyde
Tollen's Reagent colour change: Silver Mirror forms in presence of aldehyde
What are antioxidants? molecules which prevent oxidation from aking place and instead cause reductions by undergoing oxidation themselves.
Give an example of antioxidant Ascorbic acid Vitamin C Melatonin Beta-carotene
Why are antioxidants added to food? to slow the rate of oxidationa dn extend the shelf lifeof the food.
What are free radicals? atoms or molecuels which contain unpaired electrons and therefore pick up electorons from other atms, converting them into secondary free radicals
What are the negative effects of free readicals? They can break strands of DNA Too many can attack the cell membranes causing tisue damage
What is done to stop the effects of free radicals? Antioxidants provide electrons to free radicals
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