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Erstellt von scarlettjaynem
vor mehr als 9 Jahre
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Frage | Antworten |
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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