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13 Cards in this Set
- Front
- Back
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Describe the 3 different shapes that a long protein chain can form |
Helix/spirals Sheets Complex shapes |
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Explain what holds a long protein chain into a particular shape |
Amide links |
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State what causes proteins to be denatured |
Temperature and pH |
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Describe the structural change that occurs when a protein is denatured |
Both appearance and texture are changed |
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Name the functional group found in all aldehydes and ketones |
Carbonyl |
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Define and aldehyde |
A homologous series ending an 'al' Where the carbonyl group is on the end of the carbon chain |
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Define a ketone |
A homologous series ending in 'one' They have the carbonyl group not on the end of the carbon chain |
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State the type of molecule responsible for many flavours and aromas |
Aldehydes |
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Explain why aldehydes can be oxidised but ketones cannot |
Aldehydes can be oxidised because there is a hydrogen bonded to the carbonyl carbon, this carbon to hydrogen bond can be broken and a new bond to the oxygen of the oh group can form. Ketones cannot be oxidised as they do not have a hydrogen bonded to the carbonyl carbon. |
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Describe the result of an acidified dichromate test on an aldehyde and ketone |
Aldehyde - turn from orange to green ketone - remains Orange |
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Describe the positive result of a fehlings test on an aldehyde and ketone |
Aldehyde - blue solution to brick red precipitate Ketone - remains blue |
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Describe the result of tollens test on aldehydes and ketones |
Aldehyde - silver mirror forms Ketone - no silver mirror forms |
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How is an exam style question regarding physical properties answered |
State the types of bonding present between molecules. State how these types of bonding occur. Compare the strength of the bonds. Explain how the strength affects the physical property. |
